AWS Lambda in-built UUID

• Use AWS.util.uuid.v4() to generate UUID in AWS Lambda (NodeJS)
• No need to install https://www.npmjs.com/package/uuid.

Example:

const AWS = require('aws-sdk');

exports.handler = async (event) => {
   console.log(AWS.util.uuid.v4());
}

How this works:
Below snippet from aws-sdk-js shows - it does having uuid node dependency included.

  /**
   * @api private
   */
  uuid: {
    v4: function uuidV4() {
      return require('uuid').v4();
    }
  } 

Benefits

• Avoiding addition of npm dependency uuid.
• Reduced code size. Saves few milliseconds of cold start time.

Option: Node.js in-built module crypto

const {randomUUID} = require('crypto'); //Crypto is part of Node.js runtime since v14.17 
console.log(randomUUID());

Current Node.js lambda runtime 14.x does supports above code.

Learned about this option from @galkin comments to this post. Thank you.

Image by Ian Lindsay from Pixabay