# Leveraging existing event sources (S3 and CognitoUserPools)

DevFeed: [Leveraging existing event sources (S3 and CognitoUserPools)](<https://devfeed.tech/articles/leveraging-existing-event-sources-s3-and-cognitouserpools-14271.md>)

Original publisher: [Read original article](<https://www.serverless.com/blog/leverage-existing-s3-cognito-sources>)

Author: Philipp Müns

Published: 2019-08-05T00:00:00Z

Content type: tutorial

Language: en

Sources: [Serverless Blog](<https://devfeed.tech/sources/serverless-blog.md>)

Topics: [Amazon S3](<https://devfeed.tech/topics/amazon-s3.md>), [Serverless](<https://devfeed.tech/topics/serverless.md>)

Tags: [aws](<https://devfeed.tech/tags/aws.md>), [aws-lambda](<https://devfeed.tech/tags/aws-lambda.md>), [cloud-computing](<https://devfeed.tech/tags/cloud-computing.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [faas](<https://devfeed.tech/tags/faas.md>), [function-as-a-service](<https://devfeed.tech/tags/function-as-a-service.md>), [infrastructure-as-code](<https://devfeed.tech/tags/infrastructure-as-code.md>), [s3](<https://devfeed.tech/tags/s3.md>), [serverless](<https://devfeed.tech/tags/serverless.md>), [serverless-architecture](<https://devfeed.tech/tags/serverless-architecture.md>), [serverless-framework](<https://devfeed.tech/tags/serverless-framework.md>)

## AI overview

The article explains that existing Amazon S3 buckets and Amazon Cognito User Pools can be included in a Serverless service.

## Source excerpt

Its very likely your organisation has had an S3 bucket or Cognito User Pool in use for a while. Now you can just include them in your Serverless service.