Mugilan Ragupathi

How to run Fastify app in AWS Lambda

In this article, we're going to discuss about how to run Fastify app in AWS Lambda. If you're not aware of Fastify, Fastify is one of the high performant web frameworks on NodeJS. 💡TLDR: You need to use @fastify/aws-lambda package to bridge between AWS Lambda

How to allow or restrict users of specific domains in AWS Cognito

In this article, we're going to discuss how to allow or restrict users of specific domains in AWS Cognito Why you may want to restrict based on domains? You may want to build a web application for your company event where you want only the employees of your

How to Cache in AWS API Gateway

In this article, we're going to discuss how to cache the response in AWS API Gateway Why do we use cache in AWS API Gateway? Caching is one of the most commonly used solutions to reduce the load on your backend. Let's say you're

AWS Lambda

How to trigger an AWS Lambda when the user signs up in AWS Cognito

In this article, we're going to discuss how to trigger an AWS Lambda when a user signs up Whenever a user signs up, we want cognito to call a lambda function with the user's metadata so that we can save that data in dynamodb or do

AWS Lambda

How to run Python Flask application in AWS Lambda

In this article, we'll learn how to run a Python Flask application in AWS Lambda. For those who don't know what Flask is - it is a micro-framework written in Python. 💡TLDR: You can use the aws-wsgi python package to interface between Flask application and Lambda

AWS Lambda

How to run Playwright with Python in AWS Lambda

In this article, we will learn how to run Playwright with Python in AWS Lambda. For those who don't know what Playwright is - Playwright is the framework for web testing and automation. It allows testing Chromium, Firefox, and WebKit with a single API. 💡TLDR: There are 2

AWS Lambda

How to use AWS Lambda with Application Load Balancer

In this article, we will discuss how to use AWS Lambda with Application Load Balancer. 💡TLDR: Create a target group with lambda function in the load balancer and add action to the listener to forward the request to this newly created target group based on the path. Read the article

DynamoDB

How to do Pagination in DynamoDB

In this article, we will discuss how to do pagination in DynamoDB. 💡TLDR: Use the LastEvaluatedKey from the response as the value for ExclusiveStartKey in the query parameters. Why do we need Pagination? If we're using a normal relational database such as Oracle, or Postgres - you would

AWS Lambda

How to untar file from an S3 bucket using AWS Lambda (Python)

In this article, we'll discuss how to untar file to a target bucket automatically when you upload a tar file in an S3 bucket 💡The idea is to use tarfile python package to untar the files and write them to /tmp directory and then copy all the files

AWS Lambda

How to fix the CORS error when using API Gateway with Lambda

In this article, we will learn how to fix the CORS issue using AWS Lambda with API Gateway. Here is the TLDR version. 💡TLDR: If you're using Lambda Proxy Integration in API Gateway, you just have to do 2 things to fix CORS error - Add default CORS

DynamoDB

How to check the existing items and prevent unintended overwrites when adding a record in DynamoDB

In this article, we're going to discuss how to check for duplicates when inserting a record in dynamodb. Let's consider a simple dynamodb table user-jobs, where userId is the primary key and you've another attribute jobId where you store the job id. You want

AWS Lambda

How to Unzip files from S3 Bucket using AWS Lambda

This article will discuss how to unzip files automatically to the target bucket when you upload a zip file in the source bucket. 💡TLDR: The idea is to use decompress npm package to unzip the files and write them to /tmp directory and then copy all the files to the

DynamoDB

How to query dates in DynamoDB - Between, After, and Before

In this article, we will discuss how to query dates in dynamodb. The data type for storing dates in DynamoDB: There are different data types(string, number, binary, boolean, list, map, set, etc..)available in DynamoDB. We can store the dates  in ISO string format so that they can be

AWS Lambda

Get Query String & Path parameters in Lambda with API Gateway

In this article, we're going to discuss how to get query string and path parameters from API Gateway in AWS Lambda. 💡TLDR: API Gateway exposes queryParameters and pathParameters as properties in the event object. You can access like event.queryParameters?.userId or event.pathParameters?.id. What is the

fargate

How to run cron jobs (on a schedule ) using AWS Fargate

In this article, we're going to discuss how to run AWS Fargate task periodically or in a schedule. Why not use AWS Lambda to run cron job? You can even use AWS Lambda to run cron job. I've written an article on the same here. But,

AWS Lambda

How to use puppeteer with AWS Lambda

In this tutorial, we're going to learn about how to use puppeteer with AWS Lambda. As you may know, Puppeteer is a Node.js library that provides a high-level API to control Chrome/Chromium. We'll be using AWS CDK in this guide. It's an

AWS Lambda

How to run docker containers in AWS Lambda - along with CI/CD pipeline - Python version

In this article, you're going to learn about how to run docker containers in AWS Lambda using Python. Before discussing how to do that, let us discuss the need to run the lambda using docker. The typescript version of this article is available here Sometimes, your lambda function

How to run cron jobs (on a schedule) in AWS Lambda - Python version

In this article, we're going to discuss how to run the AWS Lambda function periodically or in a schedule using Python. The typescript version of this article is available here. As you may know, we need some form of the trigger to call the lambda. For example, you

AWS Lambda

Using Environment variables and secrets (API keys, database passwords) in AWS Lambda - Python Version

In this article, you're going to learn how to use environment variables and pass sensitive information such as API keys and database passwords securely to AWS Lambda using Python. The typeScript version of this article is available here What are Environment Variables? Environment variables are variables whose values

Using Elastic File System (EFS) with AWS Lambda - Python Version

In this tutorial, we're going to learn about how to use Elastic File System (EFS) with AWS Lambda using Python. Typescript version for this article is available here. We'll be using AWS CDK in this guide. It's an open source software development framework that

The Beginner's Guide to AWS CDK - Python Version

AWS CDK (Cloud Development Kit) is a software development framework that lets you define cloud resource using your favorite programming language.  At the time of this writing, AWS CDK supports Typescript, Javascript, Python, C# and Java. In this tutorial, we're going to use Python.  If you prefer typescript,

AWS Lambda

Using Elastic File System (EFS) with AWS Lambda

💡Download the free ebook on AWS Lambda here In this tutorial, we're going to learn about how to use Elastic File System (EFS) with AWS Lambda using Typescript. Python version for this article is available here. We'll be using AWS CDK in this guide. It'

AWS Lambda

Using Environment variables and secrets (API keys, database passwords) in AWS Lambda

💡Download the free ebook on AWS Lambda here In this article, you're going to learn how to use environment variables and pass sensitive information such as API keys and database passwords securely to AWS Lambda using TypeScript. The Python version of this article is available here What are

AWS Lambda

AWS Lambda Layers - The Complete Guide

💡Download the free ebook on AWS Lambda here In this step-by-step tutorial, you'll learn about why we need Lambda layer and how to create one. And, you'll also learn about how to use a lambda layer inside a lambda function. Before discussing about lambda layers -

AWS Lambda

AWS Lambda with SQS

💡Download the free ebook on AWS Lambda here Introduction Before discussing about using AWS Lambda with SQS, let us discuss about some basics What is AWS Lambda? AWS Lambda lets you to run your code without provisioning servers. It follows event driven architecture - meaning if any event happens -