Deploying HTTP API Lambdas w/ DynamoDB using CDK

This is an example of an HTTP API (AWS API Gateway v2) with endpoints served by Lambda's using DynamoDB as a backend.

Usage

Build and deploy using the scripts:

$ npm run build
$ npm run cdk deploy

This will deploy the stack into your AWS account and create all resources. When the execution finishes the API URL will be in the output:

HttpApiLambdaCdkStack.APIURL = https://_____.execute-api.us-east-1.amazonaws.com/

You can pass additional options to cdk deploy as needed. Common use case of this is passing an alternate profile, ex: npm run cdk deploy -- --profile myprofile.

Useful commands

• npm run build compile typescript to js
• npm run watch watch for changes and compile
• npm run test perform the jest unit tests
• cdk deploy deploy this stack to your default AWS account/region
• cdk diff compare deployed stack with current state
• cdk synth emits the synthesized CloudFormation template

REST API

Very basic CRUD REST API.

POST /todos

Create a new To Do

Example using curl:

$ curl -H 'Content-type: application/json' -d '
  {
    "title": "Something to do",
    "body": "More detail"
  }' \
  {API_URL}/todos

Example response:

{
  "id": "984ea401-af69-4c85-9d92-5f195d942396",
  "done": false,
  "body": "More detail",
  "title": "Something to do"
}

GET /todos

Retrieve all to dos.

Example using curl:

$ curl {API_URL}/todos

GET /todos/{id}

Retrieve a to do by its ID.

Example using curl:

$ curl {API_URL}/todos/984ea401-af69-4c85-9d92-5f195d942396

PUT /todos/{id}

Update a todo.

Example using curl:

$ curl -D - -X PUT -H 'content-type: application/json' -d '
  {
    "title": "Updated To Do"
  }' \
  {API_URL}/todos/984ea401-af69-4c85-9d92-5f195d942396

DELETE /todos/{id}

Delete a to do.

Example using curl:

$ curl -X DELETE {API_URL}/todos/984ea401-af69-4c85-9d92-5f195d942396