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AWS Lambda in-built UUID


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

exports.handler = async (event) => {
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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();
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  • 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 
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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

Top comments (2)

galkin profile image
Nikita Galkin

Use const { randomUUID } = require('crypto');

fmcdev profile image
fmcdev • Edited

This saved my day with AWS Lambda functions, to replace the AWS.util.uuid.v4() not available anymore in aws-sdk V3 without compiling and adding extra layers!!! Thanks so much!