Upload files to S3 with AWS Lambda and AWS API Gateway in TypeScript: A Step-by-Step Guide

This guide provides a step-by-step process for creating an AWS API Gateway endpoint that uploads JPEG images to Amazon S3 using AWS Lambda and TypeScript. The solution involves setting up a new directory, initializing it with necessary dependencies, creating a Lambda function in TypeScript that checks for file content and filename parameters, verifies the image type, and uploads the file to S3, and then building and deploying a SAM template that includes an API Gateway endpoint that triggers the Lambda function. Once deployed, users can test their API using cURL by sending a POST request with the image file and filename parameter. The solution provides a scalable and efficient way to handle image uploads in serverless applications.