AWS CDK

Amazon Web Services (AWS) Cloud Development Kit (CDK) is a software development framework for defining cloud infrastructure in code and provisioning it through AWS CloudFormation. CDK uses familiar programming languages, including TypeScript, and deploys everything as a CloudFormation stack.

In this tutorial, we will show you how to set up a serverless application using AWS CDK with TypeScript. We will use Amazon Simple Storage Service (S3), Amazon DynamoDB, and Amazon Route 53 to create a simple "to-do" application that allows users to create and retrieve items from a DynamoDB table.

Prerequisites Before getting started, you will need to install the following tools:

AWS CLI AWS CDK TypeScript You will also need an AWS account and IAM user with permissions to create and manage resources in the AWS Cloud.

Step 1: Create a new CDK project First, create a new directory for your project and navigate to it in the terminal. Then, use the cdk init command to create a new CDK project.

Copy code $ mkdir my-project $ cd my-project $ cdk init --language typescript This will create a new TypeScript project with the necessary dependencies and configuration files.

Step 2: Define the infrastructure Next, we will define the infrastructure for our application using CDK constructs. CDK constructs are building blocks for your cloud infrastructure. They represent specific resources, such as an S3 bucket or DynamoDB table, and provide a higher-level interface for working with them.

Add the following code to the lib/my-project-stack.ts file:

Copy code import * as cdk from 'aws-cdk-lib'; import * as s3 from 'aws-cdk-lib/aws-s3'; import * as dynamodb from 'aws-cdk-lib/aws-dynamodb'; import * as route53 from 'aws-cdk-lib/aws-route53';

export class MyProjectStack extends cdk.Stack { constructor(scope: cdk.App, id: string, props?: cdk.StackProps) { super(scope, id, props);

// Create an S3 bucket for static website hosting
const websiteBucket = new s3.Bucket(this, 'WebsiteBucket', {
  websiteIndexDocument: 'index.html',
  publicReadAccess: true,
});

// Create a DynamoDB table for storing to-do items
const todoTable = new dynamodb.Table(this, 'TodoTable', {
  partitionKey: { name: 'id', type: dynamodb.AttributeType.STRING },
  billingMode: dynamodb.BillingMode.PAY_PER_REQUEST,
});

// Create a Route 53 hosted zone for our domain
const hostedZone = new route53.PublicHostedZone(this, 'HostedZone', {
  zoneName: 'example.com',
});

} } In this code, we create an S3 bucket for static website hosting, a DynamoDB table for storing to-do items, and a

Guilherme Elizeire continue Route 53 hosted zone for our domain. The S3 bucket is configured to serve an index.html file and has public read access. The DynamoDB table has a partition key of id, which is a string type, and is configured to use the pay-per-request billing mode. The Route 53 hosted zone is for the domain example.com.

Step 3: Deploy the stack Now that we have defined our infrastructure, we can deploy it to the AWS Cloud using the CDK command-line interface ( CLI).

Run the following command to deploy the stack:

Copy code $ cdk deploy This will create all of the resources defined in the stack and output the names and URLs of the resources that were created.

Step 4: Test the application To test the application, we can use the AWS CLI to add and retrieve items from the DynamoDB table.

First, add an item to the table using the put-item command:

Copy code $ aws dynamodb put-item --table-name TodoTable --item '{"id":{"S":"1"},"text":{"S":"Buy milk"}}' Next, retrieve the item from the table using the get-item command:

Copy code $ aws dynamodb get-item --table-name TodoTable --key '{"id":{"S":"1"}}' You should see the item that you added in the output of the get-item command.

Conclusion In this tutorial, you learned how to set up a serverless application using AWS CDK with TypeScript. You used S3, DynamoDB, and Route 53 to create a simple "to-do" application that allows users to create and retrieve items from a DynamoDB table. You deployed the stack using the CDK CLI and tested the application using the AWS CLI.

AWS CDK and TypeScript provide a powerful and easy-to-use framework for defining and deploying cloud infrastructure. You can use CDK constructs to create a wide range of resources and customize them to fit your specific needs.