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I currently have a mobile application using Firebase for user authentication and storing data.

I would like to migrate from Firebase to AWS. Exporting the DB from Firebase is simple enough. Download the JSON export and populate AWS.

How do I migrate user authentication to Cognito?

over 4 years ago · Santiago Trujillo

You can use the User Migration Lambda Trigger.

over 4 years ago · Santiago Trujillo Relatório

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Accepted Answer · 2022-05-17T18:29:46.339Z

There are multiple ways to migrate users to AWS Cognito. A couple approaches are:

Import users as batches. This will require you to take users in to the forget password flow.
Onboard users to Cognito UserPools one at a time. This approach requires you to write some code to check against Cognito if the user exists and if not to authenticate users from the Firebase endpoint and if authenticated correctly save the credentials in Cognito UserPools using Cognito AdminAuth API.

For more details, refer the article from AWS, Migrating Users to Amazon Cognito User Pools.