{"id":33725,"date":"2026-02-14T05:42:25","date_gmt":"2026-02-14T05:42:25","guid":{"rendered":"https:\/\/www.oflox.com\/blog\/?p=33725"},"modified":"2026-02-14T05:42:26","modified_gmt":"2026-02-14T05:42:26","slug":"how-to-create-lambda-function-in-aws","status":"publish","type":"post","link":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/","title":{"rendered":"How to Create Lambda Function in AWS: A Step-by-Step Guide!"},"content":{"rendered":"\n<p><strong>This article offers a professional, step-by-step guide on how to create a Lambda function in AWS<\/strong>, specially written for beginners who want to understand serverless computing in a simple and practical way.<\/p>\n\n\n\n<p>In today\u2019s cloud world, developers no longer want to manage servers, operating systems, or scaling issues. They want to focus only on writing code. <strong>AWS Lambda<\/strong> makes this possible by allowing you to run code without provisioning or managing servers.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2240\" height=\"1260\" src=\"https:\/\/www.oflox.com\/blog\/wp-content\/uploads\/2026\/01\/How-to-Create-Lambda-Function-in-AWS.jpg\" alt=\"How to Create Lambda Function in AWS\" class=\"wp-image-33734\" srcset=\"https:\/\/www.oflox.com\/blog\/wp-content\/uploads\/2026\/01\/How-to-Create-Lambda-Function-in-AWS.jpg 2240w, https:\/\/www.oflox.com\/blog\/wp-content\/uploads\/2026\/01\/How-to-Create-Lambda-Function-in-AWS-768x432.jpg 768w, https:\/\/www.oflox.com\/blog\/wp-content\/uploads\/2026\/01\/How-to-Create-Lambda-Function-in-AWS-1536x864.jpg 1536w, https:\/\/www.oflox.com\/blog\/wp-content\/uploads\/2026\/01\/How-to-Create-Lambda-Function-in-AWS-2048x1152.jpg 2048w\" sizes=\"auto, (max-width: 2240px) 100vw, 2240px\" \/><\/figure>\n\n\n\n<p>In this guide, we will clearly explain <strong>what AWS Lambda is, how it works, and how you can create your first Lambda function step by step<\/strong>, even if you have never used AWS before.<\/p>\n\n\n\n<p><strong>Let\u2019s explore it together!<\/strong><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69fe1699a5674\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69fe1699a5674\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#What_Is_AWS_Lambda\" >What Is AWS Lambda?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#What_Does_%E2%80%9CServerless%E2%80%9D_Really_Mean\" >What Does \u201cServerless\u201d Really Mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#How_AWS_Lambda_Works_Internal_Flow\" >How AWS Lambda Works (Internal Flow)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#1_Basic_Flow\" >1. Basic Flow:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#2_Internal_Lifecycle\" >2. Internal Lifecycle:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#3_Cold_Start_vs_Warm_Start\" >3. Cold Start vs Warm Start:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Key_Features_of_AWS_Lambda\" >Key Features of AWS Lambda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Common_Use_Cases_of_AWS_Lambda\" >Common Use Cases of AWS Lambda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Prerequisites_to_Create_AWS_Lambda_Function\" >Prerequisites to Create AWS Lambda Function<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Programming_Languages_Supported_by_AWS_Lambda\" >Programming Languages Supported by AWS Lambda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#How_to_Create_Lambda_Function_in_AWS\" >How to Create Lambda Function in AWS?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#1_Login_to_AWS_Console\" >1. Login to AWS Console<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#2_Open_AWS_Lambda_Service\" >2. Open AWS Lambda Service<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#3_Click_%E2%80%9CCreate_Function%E2%80%9D\" >3. Click \u201cCreate Function\u201d<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#4_Configure_Basic_Function_Settings\" >4. Configure Basic Function Settings<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#5_Configure_Execution_Role_IAM\" >5. Configure Execution Role (IAM)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#6_Create_the_Function\" >6. Create the Function<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Writing_Your_First_AWS_Lambda_Code_Python\" >Writing Your First AWS Lambda Code (Python)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#1_Default_Python_Code\" >1. Default Python Code:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#2_Explanation\" >2. Explanation:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#How_to_Deploy_a_Lambda_Function\" >How to Deploy a Lambda Function?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#How_to_Test_AWS_Lambda_Function\" >How to Test AWS Lambda Function<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Adding_Triggers_to_AWS_Lambda\" >Adding Triggers to AWS Lambda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#AWS_Lambda_with_API_Gateway_Overview\" >AWS Lambda with API Gateway (Overview)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#AWS_Lambda_Pricing_Explained_Simple_Words\" >AWS Lambda Pricing Explained (Simple Words)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#1_Free_Tier\" >1. Free Tier:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#2_Paid_Usage_Depends_On\" >2. Paid Usage Depends On:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#AWS_Lambda_Limits_You_Must_Know\" >AWS Lambda Limits You Must Know<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#AWS_Lambda_vs_EC2_Quick_Comparison\" >AWS Lambda vs EC2 (Quick Comparison)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Best_Practices_for_AWS_Lambda\" >Best Practices for AWS Lambda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Common_Mistakes_Beginners_Make\" >Common Mistakes Beginners Make<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#AWS_Lambda_Security_Best_Practices\" >AWS Lambda Security Best Practices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#5_Tools_Commonly_Used_with_AWS_Lambda\" >5+ Tools Commonly Used with AWS Lambda<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#1_AWS_API_Gateway\" >1. AWS API Gateway<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#2_AWS_CloudWatch\" >2. AWS CloudWatch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#3_Amazon_DynamoDB\" >3. Amazon DynamoDB<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#4_Amazon_S3_Simple_Storage_Service\" >4. Amazon S3 (Simple Storage Service)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#5_Amazon_EventBridge\" >5. Amazon EventBridge<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#6_AWS_IAM_Identity_and_Access_Management\" >6. AWS IAM (Identity and Access Management)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#When_You_Should_NOT_Use_AWS_Lambda\" >When You Should NOT Use AWS Lambda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#Future_of_AWS_Lambda_Serverless\" >Future of AWS Lambda &amp; Serverless<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-what-is-aws-lambda\"><span class=\"ez-toc-section\" id=\"What_Is_AWS_Lambda\"><\/span>What Is AWS Lambda?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>AWS Lambda is a <strong><a href=\"https:\/\/www.oflox.com\/blog\/what-is-serverless-computing\/\" target=\"_blank\" rel=\"noreferrer noopener\">serverless computing service<\/a><\/strong> provided by Amazon Web Services (AWS). It allows you to run your code <strong>without creating or managing servers<\/strong>.<\/p>\n\n\n\n<p id=\"h-in-simple-words\"><strong>In simple words,<\/strong> AWS Lambda runs your code <strong>only when needed<\/strong> and automatically handles:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Server provisioning<\/li>\n\n\n\n<li>Scaling<\/li>\n\n\n\n<li>Availability<\/li>\n\n\n\n<li>Maintenance<\/li>\n<\/ul>\n\n\n\n<p>You just upload your code, and AWS Lambda executes it when an event happens.<\/p>\n\n\n\n<p id=\"h-real-life-example\"><strong>Real-Life Example:<\/strong><\/p>\n\n\n\n<p>Think of AWS Lambda like <strong>electricity at home<\/strong>. You don\u2019t run a power plant. You just switch on the button and pay only for the units you use.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-does-serverless-really-mean\"><span class=\"ez-toc-section\" id=\"What_Does_%E2%80%9CServerless%E2%80%9D_Really_Mean\"><\/span>What Does \u201cServerless\u201d Really Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u201cServerless\u201d does <strong>not<\/strong> mean there are no servers. It means <strong>you don\u2019t manage them<\/strong>.<\/p>\n\n\n\n<p><strong>AWS:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Handles servers<\/li>\n\n\n\n<li>Scales automatically<\/li>\n\n\n\n<li>Takes care of failures<\/li>\n<\/ul>\n\n\n\n<p><strong>You:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Write code<\/li>\n\n\n\n<li>Define triggers<\/li>\n\n\n\n<li>Pay only for usage<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-aws-lambda-works-internal-flow\"><span class=\"ez-toc-section\" id=\"How_AWS_Lambda_Works_Internal_Flow\"><\/span>How AWS Lambda Works (Internal Flow)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>AWS Lambda follows an <strong>event-driven architecture<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-basic-flow\"><span class=\"ez-toc-section\" id=\"1_Basic_Flow\"><\/span>1. <strong>Basic Flow:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>An event occurs (API request, file upload, cron job, etc.)<\/li>\n\n\n\n<li>AWS Lambda is triggered<\/li>\n\n\n\n<li>Lambda runs your function code<\/li>\n\n\n\n<li>The result is returned<\/li>\n\n\n\n<li>Function stops automatically<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-internal-lifecycle\"><span class=\"ez-toc-section\" id=\"2_Internal_Lifecycle\"><\/span>2. <strong>Internal Lifecycle:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Event Source<\/strong> \u2192 API Gateway \/ S3 \/ EventBridge<\/li>\n\n\n\n<li><strong>Lambda Function<\/strong> \u2192 Executes code<\/li>\n\n\n\n<li><strong>IAM Role<\/strong> \u2192 Grants permissions<\/li>\n\n\n\n<li><strong>CloudWatch Logs<\/strong> \u2192 Monitoring &amp; debugging<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-cold-start-vs-warm-start\"><span class=\"ez-toc-section\" id=\"3_Cold_Start_vs_Warm_Start\"><\/span>3. <strong>Cold Start vs Warm Start:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cold Start:<\/strong> First execution, slightly slower<\/li>\n\n\n\n<li><strong>Warm Start:<\/strong> Reused environment, faster execution<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-key-features-of-aws-lambda\"><span class=\"ez-toc-section\" id=\"Key_Features_of_AWS_Lambda\"><\/span>Key Features of AWS Lambda<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fully serverless execution<\/li>\n\n\n\n<li>Automatic scaling<\/li>\n\n\n\n<li>Pay-per-execution pricing<\/li>\n\n\n\n<li>Multiple programming languages<\/li>\n\n\n\n<li>Built-in monitoring (CloudWatch)<\/li>\n\n\n\n<li>Secure by default with IAM<\/li>\n\n\n\n<li>Integrates with 200+ AWS services<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-common-use-cases-of-aws-lambda\"><span class=\"ez-toc-section\" id=\"Common_Use_Cases_of_AWS_Lambda\"><\/span>Common Use Cases of AWS Lambda<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>AWS Lambda is widely used in real-world applications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Backend APIs<\/li>\n\n\n\n<li>File processing (S3 upload)<\/li>\n\n\n\n<li>Scheduled cron jobs<\/li>\n\n\n\n<li>Data transformation<\/li>\n\n\n\n<li>Chatbots<\/li>\n\n\n\n<li>Automation scripts<\/li>\n\n\n\n<li>IoT data handling<\/li>\n\n\n\n<li>Email notifications<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-prerequisites-to-create-aws-lambda-function\"><span class=\"ez-toc-section\" id=\"Prerequisites_to_Create_AWS_Lambda_Function\"><\/span>Prerequisites to Create AWS Lambda Function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Before creating a Lambda function, you need:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An AWS account<\/li>\n\n\n\n<li>Basic programming knowledge<\/li>\n\n\n\n<li>Understanding of events &amp; triggers<\/li>\n\n\n\n<li>Basic idea of IAM (permissions)<\/li>\n<\/ul>\n\n\n\n<p>No advanced server knowledge is required.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-programming-languages-supported-by-aws-lambda\"><span class=\"ez-toc-section\" id=\"Programming_Languages_Supported_by_AWS_Lambda\"><\/span>Programming Languages Supported by AWS Lambda<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>AWS Lambda supports multiple runtimes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Python (most popular)<\/li>\n\n\n\n<li>Node.js<\/li>\n\n\n\n<li>Java<\/li>\n\n\n\n<li>Go<\/li>\n\n\n\n<li>C#<\/li>\n\n\n\n<li>Ruby<\/li>\n\n\n\n<li>Custom runtimes (Docker-based)<\/li>\n<\/ul>\n\n\n\n<p>For beginners, <strong>Python or Node.js<\/strong> is recommended.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-create-lambda-function-in-aws\"><span class=\"ez-toc-section\" id=\"How_to_Create_Lambda_Function_in_AWS\"><\/span>How to Create Lambda Function in AWS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Now let\u2019s create a Lambda function step by step.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-login-to-aws-console\"><span class=\"ez-toc-section\" id=\"1_Login_to_AWS_Console\"><\/span>1. <strong>Login to AWS Console<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Go to <strong>aws.amazon.com<\/strong><\/li>\n\n\n\n<li>Login to AWS Management Console<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-open-aws-lambda-service\"><span class=\"ez-toc-section\" id=\"2_Open_AWS_Lambda_Service\"><\/span>2. <strong>Open AWS Lambda Service<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Search for <strong>Lambda<\/strong> in AWS services<\/li>\n\n\n\n<li>Click on <strong>AWS Lambda<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-click-create-function\"><span class=\"ez-toc-section\" id=\"3_Click_%E2%80%9CCreate_Function%E2%80%9D\"><\/span>3. <strong>Click \u201cCreate Function\u201d<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>You will see three options:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Author from scratch<\/li>\n\n\n\n<li>Use a blueprint<\/li>\n\n\n\n<li>Container image<\/li>\n<\/ul>\n\n\n\n<p>Choose <strong>Author from scratch<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-configure-basic-function-settings\"><span class=\"ez-toc-section\" id=\"4_Configure_Basic_Function_Settings\"><\/span>4. <strong>Configure Basic Function Settings<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Fill the details:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Function name:<\/strong> helloLambda<\/li>\n\n\n\n<li><strong>Runtime:<\/strong> Python 3.x<\/li>\n\n\n\n<li><strong>Architecture:<\/strong> x86_64<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-configure-execution-role-iam\"><span class=\"ez-toc-section\" id=\"5_Configure_Execution_Role_IAM\"><\/span>5. <strong>Configure Execution Role (IAM)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Select:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Create a new role with basic Lambda permissions<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This allows Lambda to write logs to CloudWatch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-6-create-the-function\"><span class=\"ez-toc-section\" id=\"6_Create_the_Function\"><\/span>6. <strong>Create the Function<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Click the <strong>Create function<\/strong>. Your Lambda function is now created \ud83c\udf89<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-writing-your-first-aws-lambda-code-python\"><span class=\"ez-toc-section\" id=\"Writing_Your_First_AWS_Lambda_Code_Python\"><\/span>Writing Your First AWS Lambda Code (Python)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>AWS Lambda uses a <strong>handler function<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-default-python-code\"><span class=\"ez-toc-section\" id=\"1_Default_Python_Code\"><\/span>1. <strong>Default Python Code:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>def lambda_handler(event, context):\n    return {\n        'statusCode': 200,\n        'body': 'Hello from AWS Lambda!'\n    }\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-explanation\"><span class=\"ez-toc-section\" id=\"2_Explanation\"><\/span>2. <strong>Explanation:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>event: Input data<\/li>\n\n\n\n<li>context: Runtime information<\/li>\n\n\n\n<li>return: Response<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-deploy-a-lambda-function\"><span class=\"ez-toc-section\" id=\"How_to_Deploy_a_Lambda_Function\"><\/span>How to Deploy a Lambda Function?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Whenever you edit the code:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Click <strong>Deploy<\/strong><\/li>\n\n\n\n<li>AWS updates the function instantly<\/li>\n<\/ul>\n\n\n\n<p>No server restart required.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-test-aws-lambda-function\"><span class=\"ez-toc-section\" id=\"How_to_Test_AWS_Lambda_Function\"><\/span>How to Test AWS Lambda Function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Click <strong>Test<\/strong><\/li>\n\n\n\n<li>Create a test event<\/li>\n\n\n\n<li>Click <strong>Invoke<\/strong><\/li>\n\n\n\n<li>Check output &amp; logs<\/li>\n<\/ol>\n\n\n\n<p>You can see logs in <strong>CloudWatch<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-adding-triggers-to-aws-lambda\"><span class=\"ez-toc-section\" id=\"Adding_Triggers_to_AWS_Lambda\"><\/span>Adding Triggers to AWS Lambda<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Lambda works with triggers.<\/p>\n\n\n\n<p id=\"h-common-triggers\"><strong>Common Triggers:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>API Gateway (HTTP requests)<\/li>\n\n\n\n<li>S3 (file uploads)<\/li>\n\n\n\n<li>DynamoDB<\/li>\n\n\n\n<li>EventBridge (cron jobs)<\/li>\n\n\n\n<li>SNS \/ SQS<\/li>\n<\/ul>\n\n\n\n<p><strong>Example:<\/strong> When a file is uploaded to S3 \u2192 Lambda runs automatically.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-aws-lambda-with-api-gateway-overview\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_with_API_Gateway_Overview\"><\/span>AWS Lambda with API Gateway (Overview)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>API Gateway allows you to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Expose Lambda as a REST or HTTP API<\/li>\n\n\n\n<li>Handle request &amp; response<\/li>\n\n\n\n<li>Secure endpoints<\/li>\n<\/ul>\n\n\n\n<p id=\"h-flow\"><strong>Flow:<\/strong><\/p>\n\n\n\n<p>User \u2192 API Gateway \u2192 Lambda \u2192 Response<\/p>\n\n\n\n<p>This is commonly used for <strong>serverless backend APIs<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-aws-lambda-pricing-explained-simple-words\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_Pricing_Explained_Simple_Words\"><\/span>AWS Lambda Pricing Explained (Simple Words)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>AWS Lambda follows <strong>pay-as-you-go<\/strong> pricing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-free-tier\"><span class=\"ez-toc-section\" id=\"1_Free_Tier\"><\/span>1. <strong>Free Tier:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1 million requests per month<\/li>\n\n\n\n<li>400,000 GB-seconds compute time<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-paid-usage-depends-on\"><span class=\"ez-toc-section\" id=\"2_Paid_Usage_Depends_On\"><\/span>2. <strong>Paid Usage Depends On:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Number of requests<\/li>\n\n\n\n<li>Execution duration<\/li>\n\n\n\n<li>Memory allocated<\/li>\n<\/ul>\n\n\n\n<p>You only pay when your function runs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-aws-lambda-limits-you-must-know\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_Limits_You_Must_Know\"><\/span>AWS Lambda Limits You Must Know<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Max execution time: <\/strong>15 minutes<\/li>\n\n\n\n<li><strong>Memory: <\/strong>128 MB to 10 GB<\/li>\n\n\n\n<li>Payload size limit<\/li>\n\n\n\n<li>Concurrent execution limits<\/li>\n<\/ul>\n\n\n\n<p>These limits are sufficient for most applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-aws-lambda-vs-ec2-quick-comparison\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_vs_EC2_Quick_Comparison\"><\/span>AWS Lambda vs EC2 (Quick Comparison)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>AWS Lambda<\/th><th>EC2<\/th><\/tr><\/thead><tbody><tr><td>Server management<\/td><td>No<\/td><td>Yes<\/td><\/tr><tr><td>Scaling<\/td><td>Automatic<\/td><td>Manual<\/td><\/tr><tr><td>Pricing<\/td><td>Per execution<\/td><td>Per hour<\/td><\/tr><tr><td>Maintenance<\/td><td>AWS handles<\/td><td>You handle<\/td><\/tr><tr><td>Best for<\/td><td>Event-based tasks<\/td><td>Long-running apps<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-best-practices-for-aws-lambda\"><span class=\"ez-toc-section\" id=\"Best_Practices_for_AWS_Lambda\"><\/span>Best Practices for AWS Lambda<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Keep functions small<\/li>\n\n\n\n<li>One function = one responsibility<\/li>\n\n\n\n<li>Use environment variables<\/li>\n\n\n\n<li>Optimize memory allocation<\/li>\n\n\n\n<li>Monitor logs<\/li>\n\n\n\n<li>Handle errors properly<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-common-mistakes-beginners-make\"><span class=\"ez-toc-section\" id=\"Common_Mistakes_Beginners_Make\"><\/span>Common Mistakes Beginners Make<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Giving full IAM permissions<\/li>\n\n\n\n<li>Ignoring timeouts<\/li>\n\n\n\n<li>Hardcoding secrets<\/li>\n\n\n\n<li>Creating large functions<\/li>\n\n\n\n<li>Not monitoring logs<\/li>\n<\/ul>\n\n\n\n<p>Avoiding these improves performance and security.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-aws-lambda-security-best-practices\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_Security_Best_Practices\"><\/span>AWS Lambda Security Best Practices<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Follow least-privilege IAM<\/li>\n\n\n\n<li>Use AWS Secrets Manager<\/li>\n\n\n\n<li>Enable CloudWatch logs<\/li>\n\n\n\n<li>Secure API Gateway endpoints<\/li>\n\n\n\n<li>Avoid public access unless required<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-5-tools-commonly-used-with-aws-lambda\"><span class=\"ez-toc-section\" id=\"5_Tools_Commonly_Used_with_AWS_Lambda\"><\/span>5+ Tools Commonly Used with AWS Lambda<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To build a complete serverless application, AWS Lambda is commonly used with several other AWS tools that support data storage, APIs, automation, and monitoring.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_AWS_API_Gateway\"><\/span>1. <strong>AWS API Gateway<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>AWS API Gateway<\/strong> is the most commonly used service with AWS Lambda. AWS API Gateway allows you to <strong>expose your Lambda function as an HTTP or REST API<\/strong> so users can access it through a URL.<\/p>\n\n\n\n<p><strong>How it works with Lambda:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>User sends a request (GET, POST, PUT, DELETE)<\/li>\n\n\n\n<li>API Gateway receives the request<\/li>\n\n\n\n<li>API Gateway triggers the Lambda function<\/li>\n\n\n\n<li>Lambda processes the request<\/li>\n\n\n\n<li>Response is returned to the user<\/li>\n<\/ol>\n\n\n\n<p><strong>Real-world example:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Login API<\/li>\n\n\n\n<li>Signup API<\/li>\n\n\n\n<li>Contact form submission<\/li>\n\n\n\n<li>Mobile app backend<\/li>\n\n\n\n<li>Serverless website backend<\/li>\n<\/ul>\n\n\n\n<p><strong>Why it\u2019s important:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No server management<\/li>\n\n\n\n<li>Built-in security (API keys, auth)<\/li>\n\n\n\n<li>Scales automatically<\/li>\n\n\n\n<li>Perfect for serverless APIs<\/li>\n<\/ul>\n\n\n\n<p><strong>Note: <\/strong>Most AWS Lambda projects use API Gateway<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_AWS_CloudWatch\"><\/span>2. <strong>AWS CloudWatch<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>AWS CloudWatch<\/strong> is the <strong>monitoring and logging service<\/strong> for AWS Lambda. it does CloudWatch automatically:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stores logs<\/li>\n\n\n\n<li>Tracks errors<\/li>\n\n\n\n<li>Measures performance<\/li>\n\n\n\n<li>Shows execution metrics<\/li>\n<\/ul>\n\n\n\n<p id=\"h-cloudwatch-helps-you-see-what-your-lambda-function-is-doing-behind-the-scenes\">CloudWatch helps you <strong>see what your Lambda function is doing behind the scenes<\/strong>.<\/p>\n\n\n\n<p><strong>What CloudWatch logs:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Console output (print\/logs)<\/li>\n\n\n\n<li>Errors and exceptions<\/li>\n\n\n\n<li>Execution time<\/li>\n\n\n\n<li>Memory usage<\/li>\n\n\n\n<li>Invocation count<\/li>\n<\/ul>\n\n\n\n<p><strong>Real-world example:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Debugging failed Lambda executions<\/li>\n\n\n\n<li>Monitoring slow functions<\/li>\n\n\n\n<li>Tracking usage spikes<\/li>\n<\/ul>\n\n\n\n<p><strong>Why it\u2019s important:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Without CloudWatch, debugging Lambda is almost impossible<\/li>\n\n\n\n<li>Helps optimize cost and performance<\/li>\n\n\n\n<li>Essential for production apps<\/li>\n<\/ul>\n\n\n\n<p><strong>Note: <\/strong>Every Lambda function automatically integrates with CloudWatch<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Amazon_DynamoDB\"><\/span>3. <strong>Amazon DynamoDB<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>DynamoDB<\/strong> is a <strong>fully managed NoSQL database<\/strong> commonly used with AWS Lambda. It stores and retrieves data at <strong>very high speed<\/strong> without managing servers.<\/p>\n\n\n\n<p><strong>How it works with Lambda:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lambda writes data to DynamoDB<\/li>\n\n\n\n<li>Lambda reads data from DynamoDB<\/li>\n\n\n\n<li>DynamoDB can also trigger Lambda on data changes<\/li>\n<\/ul>\n\n\n\n<p><strong>Real-world examples:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>User profiles<\/li>\n\n\n\n<li>Session storage<\/li>\n\n\n\n<li>Order data<\/li>\n\n\n\n<li>Application logs<\/li>\n\n\n\n<li>IoT sensor data<\/li>\n<\/ul>\n\n\n\n<p><strong>Why Lambda + DynamoDB is powerful:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Both are serverless<\/li>\n\n\n\n<li>Both scales automatically<\/li>\n\n\n\n<li>Very low operational cost<\/li>\n\n\n\n<li>Ideal for modern web &amp; mobile apps<\/li>\n<\/ul>\n\n\n\n<p><strong>Note: <\/strong>Lambda + DynamoDB = true serverless backend<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Amazon_S3_Simple_Storage_Service\"><\/span>4. <strong>Amazon S3 (Simple Storage Service)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>Amazon S3<\/strong> is used to store files, images, videos, backups, and logs. it does S3 stores <strong>objects (files)<\/strong> securely and reliably.<\/p>\n\n\n\n<p><strong>How it works with Lambda:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>File uploaded to S3 \u2192 Lambda triggered<\/li>\n\n\n\n<li>Lambda processes the file<\/li>\n\n\n\n<li>Lambda stores results back to S3<\/li>\n<\/ul>\n\n\n\n<p><strong>Real-world examples:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Image resizing<\/li>\n\n\n\n<li>Video processing<\/li>\n\n\n\n<li>File validation<\/li>\n\n\n\n<li>Backup automation<\/li>\n\n\n\n<li>CSV or JSON file processing<\/li>\n<\/ul>\n\n\n\n<p><strong>Example scenario:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>User uploads image to S3<\/li>\n\n\n\n<li>Lambda resizes the image<\/li>\n\n\n\n<li>Processed image is saved back to S3<\/li>\n<\/ol>\n\n\n\n<p><strong>Why it\u2019s important:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Event-driven architecture<\/li>\n\n\n\n<li>No manual intervention<\/li>\n\n\n\n<li>Cost-effective storage<\/li>\n<\/ul>\n\n\n\n<p><strong>Note: <\/strong>S3 + Lambda is widely used for automation<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Amazon_EventBridge\"><\/span>5. <strong>Amazon EventBridge<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>EventBridge<\/strong> is used for <strong>event-based automation and scheduling<\/strong>.<\/p>\n\n\n\n<p><strong>What it does:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Triggers Lambda based on events<\/li>\n\n\n\n<li>Runs Lambda on a schedule (cron jobs)<\/li>\n\n\n\n<li>Connects multiple AWS services<\/li>\n<\/ul>\n\n\n\n<p><strong>Common use cases:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Daily reports<\/li>\n\n\n\n<li>Cleanup tasks<\/li>\n\n\n\n<li>Scheduled backups<\/li>\n\n\n\n<li>Syncing data<\/li>\n\n\n\n<li>Monitoring system health<\/li>\n<\/ul>\n\n\n\n<p><strong>Example:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Run Lambda every day at 12 AM<\/li>\n\n\n\n<li>Trigger Lambda when EC2 state changes<\/li>\n\n\n\n<li>Trigger Lambda when payment is completed<\/li>\n<\/ul>\n\n\n\n<p><strong>Why it\u2019s important:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Replaces traditional cron servers<\/li>\n\n\n\n<li>Fully serverless scheduling<\/li>\n\n\n\n<li>Reliable and scalable<\/li>\n<\/ul>\n\n\n\n<p><strong>Note: <\/strong>EventBridge is the backbone of serverless automation<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_AWS_IAM_Identity_and_Access_Management\"><\/span>6. <strong>AWS IAM (Identity and Access Management)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>IAM<\/strong> is the <strong>security foundation<\/strong> of AWS Lambda. It controls <strong>who can access what<\/strong> in AWS.<\/p>\n\n\n\n<p><strong>IAM roles in Lambda:<\/strong><\/p>\n\n\n\n<p>Each Lambda function runs with an <strong>IAM role<\/strong> that defines:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Which services can it access<\/li>\n\n\n\n<li>What actions can it perform<\/li>\n<\/ul>\n\n\n\n<p><strong>Example permissions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Read from S3<\/li>\n\n\n\n<li>Write to DynamoDB<\/li>\n\n\n\n<li>Publish to SNS<\/li>\n\n\n\n<li>Write logs to CloudWatch<\/li>\n<\/ul>\n\n\n\n<p><strong>Why IAM is critical:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prevents unauthorized access<\/li>\n\n\n\n<li>Protects sensitive data<\/li>\n\n\n\n<li>Follows the least-privilege principle<\/li>\n<\/ul>\n\n\n\n<p><strong>Note: <\/strong>Always give the minimum required permissions only<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-when-you-should-not-use-aws-lambda\"><span class=\"ez-toc-section\" id=\"When_You_Should_NOT_Use_AWS_Lambda\"><\/span>When You Should NOT Use AWS Lambda<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>AWS Lambda is not suitable for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Long-running processes<\/li>\n\n\n\n<li>Heavy CPU workloads<\/li>\n\n\n\n<li>Persistent connections<\/li>\n\n\n\n<li>Real-time streaming servers<\/li>\n<\/ul>\n\n\n\n<p>In such cases, EC2 or containers are better.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-future-of-aws-lambda-amp-serverless\"><span class=\"ez-toc-section\" id=\"Future_of_AWS_Lambda_Serverless\"><\/span>Future of AWS Lambda &amp; Serverless<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Serverless is growing rapidly:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lower infrastructure cost<\/li>\n\n\n\n<li>Faster development<\/li>\n\n\n\n<li>Better scalability<\/li>\n\n\n\n<li>Strong integration with AI &amp; automation<\/li>\n<\/ul>\n\n\n\n<p>AWS Lambda will continue to be a core cloud service.<\/p>\n\n\n\n<p id=\"h-faqs\" style=\"font-size:23px\"><strong>FAQs:)<\/strong><\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1769510593670\"><strong class=\"schema-faq-question\">Q. Is AWS Lambda free?<\/strong> <p class=\"schema-faq-answer\"><strong>A. <\/strong>Yes, AWS offers a generous free tier.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1769510602374\"><strong class=\"schema-faq-question\">Q. Is AWS Lambda good for beginners?<\/strong> <p class=\"schema-faq-answer\"><strong>A. <\/strong>Yes, it\u2019s one of the best ways to learn cloud computing.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1769510603805\"><strong class=\"schema-faq-question\">Q. Which language is best for Lambda?<\/strong> <p class=\"schema-faq-answer\"><strong>A. <\/strong>Python and Node.js are best for beginners.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1769510620071\"><strong class=\"schema-faq-question\">Q. Can Lambda replace EC2?<\/strong> <p class=\"schema-faq-answer\"><strong>A. <\/strong>No, both have different use cases.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1769510620882\"><strong class=\"schema-faq-question\">Q. Is AWS Lambda secure?<\/strong> <p class=\"schema-faq-answer\"><strong>A. <\/strong>Yes, when used with proper IAM and security practices.<\/p> <\/div> <\/div>\n\n\n\n<p id=\"h-conclusion\" style=\"font-size:23px\"><strong>Conclusion:)<\/strong><\/p>\n\n\n\n<p>AWS Lambda is one of the most powerful services offered by Amazon Web Services. It allows developers to build scalable, cost-effective, and serverless applications without worrying about infrastructure management. By learning how to create a Lambda function in AWS, you unlock the foundation of modern cloud and serverless architecture.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong><em>\u201cOne-to-one marketing is the bridge between customer attention and brand retention.\u201d \u2014 Mr Rahman, CEO Oflox\u00ae<\/em><\/strong><\/p>\n<\/blockquote>\n\n\n\n<p><strong>Read also:)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.oflox.com\/blog\/what-is-serverless-computing\/\" target=\"_blank\" rel=\"noreferrer noopener\">What Is Serverless Computing: A-to-Z Guide for Beginners!<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.oflox.com\/blog\/best-vpn-for-india-server-free\/\" target=\"_blank\" rel=\"noreferrer noopener\">5+ Best VPN for India Server Free (2026 Guide for Indian Users)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.oflox.com\/blog\/what-is-a-virtual-server\/\" target=\"_blank\" rel=\"noreferrer noopener\">What Is a Virtual Server: A-to-Z Guide for Beginners!<\/a><\/li>\n<\/ul>\n\n\n\n<p><strong><em>Have you tried creating an AWS Lambda function for your project? Share your experience or ask your questions in the comments below \u2014 we\u2019d love to hear from you!<\/em><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article offers a professional, step-by-step guide on how to create a Lambda function in AWS, specially written for beginners &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to Create Lambda Function in AWS: A Step-by-Step Guide!\" class=\"read-more button\" href=\"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#more-33725\" aria-label=\"More on How to Create Lambda Function in AWS: A Step-by-Step Guide!\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":33734,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2345],"tags":[46846,46857,46847,46852,46849,46862,46854,46848,46856,46851,46840,46844,46841,46858,46865,46843,46839,46859,46861,46860,46866,46863,46855,46864,46842,46853,46850,46845],"class_list":["post-33725","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internet","tag-aws-lambda-example","tag-aws-lambda-free-tier-explained","tag-aws-lambda-function-node-js","tag-aws-lambda-function-python","tag-aws-lambda-pricing","tag-aws-lambda-python-example","tag-aws-lambda-trigger","tag-aws-lambda-tutorial-for-beginners","tag-aws-lambda-vs-ec2","tag-create-aws-lambda-function-step-by-step","tag-create-lambda","tag-create-lambda-function","tag-create-lambda-function-in-aws","tag-how-aws-lambda-works-internally","tag-how-to-create-a-aws-lambda-function-in-python","tag-how-to-create-lambda-function","tag-how-to-create-lambda-function-in-aws","tag-how-to-create-lambda-function-in-aws-java","tag-how-to-create-lambda-function-in-excel","tag-how-to-create-lambda-function-in-java","tag-how-to-create-lambda-function-in-python","tag-how-to-create-lambda-function-w3schools","tag-how-to-deploy-aws-lambda-function","tag-lambda-function-aws","tag-lambda-function-in-aws","tag-serverless-computing-aws","tag-what-is-lambda-function","tag-what-is-lambda-function-in-aws","resize-featured-image"],"yoast_head":"<!-- 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Team","image":{"@type":"ImageObject","inLanguage":"en","@id":"https:\/\/secure.gravatar.com\/avatar\/ff86524713a69d2c211ad6cbec38fb15eb59030ba5e59ddad406dfb7eb4e5b0c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/ff86524713a69d2c211ad6cbec38fb15eb59030ba5e59ddad406dfb7eb4e5b0c?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/ff86524713a69d2c211ad6cbec38fb15eb59030ba5e59ddad406dfb7eb4e5b0c?s=96&d=mm&r=g","caption":"Editorial Team"},"sameAs":["https:\/\/www.oflox.com\/","https:\/\/www.facebook.com\/ofloxindia\/","https:\/\/www.instagram.com\/ofloxindia\/","https:\/\/www.linkedin.com\/company\/ofloxindia\/","https:\/\/x.com\/oflox3"]},{"@type":"Question","@id":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510593670","position":1,"url":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510593670","name":"Q. Is AWS Lambda free?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>A. <\/strong>Yes, AWS offers a generous free tier.","inLanguage":"en"},"inLanguage":"en"},{"@type":"Question","@id":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510602374","position":2,"url":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510602374","name":"Q. Is AWS Lambda good for beginners?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>A. <\/strong>Yes, it\u2019s one of the best ways to learn cloud computing.","inLanguage":"en"},"inLanguage":"en"},{"@type":"Question","@id":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510603805","position":3,"url":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510603805","name":"Q. Which language is best for Lambda?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>A. <\/strong>Python and Node.js are best for beginners.","inLanguage":"en"},"inLanguage":"en"},{"@type":"Question","@id":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510620071","position":4,"url":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510620071","name":"Q. Can Lambda replace EC2?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>A. <\/strong>No, both have different use cases.","inLanguage":"en"},"inLanguage":"en"},{"@type":"Question","@id":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510620882","position":5,"url":"https:\/\/www.oflox.com\/blog\/how-to-create-lambda-function-in-aws\/#faq-question-1769510620882","name":"Q. 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