Getting started with AWS SAM and the AWS CDK PDF ( attr(href) ) RSS ( attr(href) ) This topic describes what you need to use the AWS SAM CLI with AWS CDK applications, and provides instructions for building and locally testing a simple AWS CDK application. Prerequisites To use the AWS SAM CLI with AWS CDK, you must install the AWS CDK, and the AWS SAM CLI. For information about installing the AWS CDK, see [Getting started with the AWS CDK ( attr(href) )](https://docs.aws.amazon.com/cdk/latest/guide/getting_started.html) in the _AWS Cloud Development Kit (AWS CDK) Developer Guide_. For information about installing the AWS SAM CLI, see [Installing the AWS SAM CLI ( attr(href) )](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install.html) . Creating and locally testing an AWS CDK application To locally test an AWS CDK application using the AWS SAM CLI, you must have a AWS CDK application that contains a Lambda function. Use the following steps to create a basic AWS CDK application with a Lambda function. For more information, see Creating a serverless application using the AWS CDK ( attr(href) ) in the AWS Cloud Development Kit (AWS CDK) Developer Guide. ![[./resources/getting-started-with-aws-sam-and-the-aws-cdk-aws-s.resources/svg_1.svg]]Note The AWS SAM CLI supports AWS CDK v1 starting from version 1.135.0 and AWS CDK v2 starting from version 2.0.0. Step 1: Create an AWS CDK application For this tutorial, initialize an AWS CDK application that uses TypeScript. Command to run: anchoranchor ![[./resources/getting-started-with-aws-sam-and-the-aws-cdk-aws-s.resources/svg_2.svg]] mkdir cdk-sam-example cd cdk-sam-example cdk init app --language typescript Step 2: Add a Lambda function to your application Replace the code in lib/cdk-sam-example-stack.ts with the following: anchoranchor ![[./resources/getting-started-with-aws-sam-and-the-aws-cdk-aws-s.resources/svg_3.svg]] `import { Stack, StackProps } from ‘aws-cdk-lib’; import { Construct } from ‘constructs’; import * as lambda from ‘aws-cdk-lib/aws-lambda’; export class CdkSamExampleStack extends Stack { constructor(scope: Construct, id: string, props?: StackProps) { super(scope, id, props); new lambda.Function(this, 'MyFunction', { runtime: lambda.Runtime.PYTHON_3_7, handler: 'app.lambda_handler', code: lambda.Code.fromAsset('./my_function'), }); } }` Step 3: Add your Lambda function code Create a directory named my_function. In that directory, create a file named app.py. Command to run: ![[./resources/getting-started-with-aws-sam-and-the-aws-cdk-aws-s.resources/svg_4.svg]] mkdir my_function cd my_function touch app.py Add the following code to app.py: ![[./resources/getting-started-with-aws-sam-and-the-aws-cdk-aws-s.resources/svg_5.svg]] def lambda_handler(event, context): return "Hello from SAM and the CDK!" Step 4: Test your Lambda function You can use the AWS SAM CLI to locally invoke a Lambda function that you define in an AWS CDK application. To do this, you need the function construct identifier and the path to your synthesized AWS CloudFormation template. Command to run: ![[./resources/getting-started-with-aws-sam-and-the-aws-cdk-aws-s.resources/svg_6.svg]] cdk synth --no-staging ![[./resources/getting-started-with-aws-sam-and-the-aws-cdk-aws-s.resources/svg_7.svg]] sam local invoke `MyFunction` --no-event -t `./cdk.out/CdkSamExampleStack.template.json` Example output: Invoking app.lambda_handler (python3.7) START RequestId: 5434c093-7182-4012-9b06-635011cac4f2 Version: $LATEST “Hello from SAM and the CDK!” END RequestId: 5434c093-7182-4012-9b06-635011cac4f2 REPORT RequestId: 5434c093-7182-4012-9b06-635011cac4f2 Init Duration: 0.32 ms Duration: 177.47 ms Billed Duration: 178 ms Memory Size: 128 MB Max Memory Used: 128 MB For more information about options available to test AWS CDK applications using the AWS SAM CLI, see Locally testing AWS CDK applications ( attr(href) ) .