Testing with LocalStack: AWS on your Laptop

If you are building on AWS, you need LocalStack. It mocks the entire AWS cloud in a single Docker container.

Docker Compose Setup

services:
  localstack:
    image: localstack/localstack
    ports:
      - "4566:4566"
    environment:
      - SERVICES=s3,lambda,dynamodb

Now you can point your AWS SDK to `http://localhost:4566`.
`var client = new AmazonS3Client(new AmazonS3Config { ServiceURL = “http://localhost:4566” });`

You can create S3 buckets, trigger Lambdas, and write to DynamoDB locally, offline. No credit card required.