You should explore the contents of this project. It demonstrates a CDK app with stacks:

• dynamodbCdkStack: Build dynamodb table
• lambdaCdkStack: Build lambda function
• apiCdkStack: Build api gateway

The cdk.json file tells the CDK Toolkit how to execute your app.

• Node.js
• AWS CLI
• AWS CDK
• AWS Account

• Clone this repository
• Run the following commands:
  • cd aws-serverless-crud-api
  • npm install
  • Configure your AWS credentials
  • Copy .env.example to .env and update the values
  • cdk deploy --all -> Deploy all stacks
  • Play with the API
  • cdk destroy --all -> Destroy all stacks

• GET /api/users: Get all users
• GET /api/users/{id}: Get user by id
• POST /api/users: Create new user
• DELETE /api/users/{id}: Delete user by id
• PUT /api/users/{id}: Update user by id

const usersTable = new Table(this, 'usersTable', {
  tableName: TableNames.USERS,
  partitionKey: { name: 'id', type: AttributeType.STRING },
  billingMode: BillingMode.PAY_PER_REQUEST
});

• Add a lambda handler in src/handlers/user.ts

export const createUser = async (event: any): Promise<any> => {
  const user = await userService.save(JSON.parse(event.body));
  return { statusCode: 201, body: JSON.stringify(user) };
};

• Define a lambda function

const createUserFn = new NodejsFunction(this, 'createUserFn', {
  functionName: 'createUserFn',
  description: 'Create user',
  entry: 'src/handlers/user.ts',
  handler: 'createUser',
});

• Grant permission to access DynamoDB

usersTable.grantReadWriteData(createUserFn);

const restApi = new RestApi(this, 'userManagementRestApi', {
  restApiName: 'User Management API',
  description: 'User management REST API',
});

const users = apiRoot.addResource('users');
const createUserIntegration = new LambdaIntegration(createUserFn);
users.addMethod('POST', createUserIntegration);

• 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