Deploying a simple Lambda function using the Serverless framework and AWS as the provider

1. Set up your Serverless project:

# Install the Serverless CLI
npm install -g serverless

# Create a new project
serverless create --template aws-nodejs --path my-service

2. Define your Lambda functions:

In the handler.js file, add the following code:

// handler.js

exports.helloWorld = async (event, context) => {
  // Return a simple greeting
  return {
    statusCode: 200,
    body: JSON.stringify({ message: 'Hello, World!' })
  };
};

In the serverless.yml file, add the following code:

service: my-service

provider:
  name: aws
  runtime: nodejs14.x

functions:
  helloWorld:
    handler: handler.helloWorld

This defines a service with a single function called “hello” that uses the handler.hello function as its entry point.

3. Install dependencies:

In this case, there are no external dependencies to install.

4. Deploy your functions:

serverless deploy

This will package your code and upload it to AWS Lambda. The output will include the endpoint URL for your function.

5. Test your functions in AWS:

serverless invoke -f helloWorld

This will invoke the “hello” function and display the response.

6. Test your function locally:

serverless invoke local -f helloWorld

The output will be

{
    "statusCode": 200,
    "body": "{\"message\":\"Hello, World!\"}"
}

These are just a few example commands, but they should give you an idea of how to use the Serverless framework to deploy Lambda functions.