<![CDATA[Importing users over time]]>I have a large number of users. I want to import them into FusionAuth with their password hashes and the accompanying data like the factor.

But my cutover is going to be slow, so I expect some percentage of people to change their password hashes after the import.

So I'd like synchronize any password hashes that changed in the meantime, and then roll out FusionAuth.

I can't re-import password hashes for an existing user, and the User API doesn't let me update passwords hashes, per this closed issue: https://github.com/FusionAuth/fusionauth-issues/issues/348

What would you recommend?

]]>https://fusionauth.io/community/forum/topic/3100/importing-users-over-timeRSS for NodeSun, 14 Jun 2026 19:22:45 GMTWed, 11 Mar 2026 17:19:14 GMT60<![CDATA[Reply to Importing users over time on Wed, 11 Mar 2026 17:20:38 GMT]]>I think the way I'd approach this is:

  • import all users into FusionAuth

At cutover time:

  • look at local database to see which password hashes had changed
  • pull the user data from FusionAuth for each of these users
  • delete the user
  • re-import the user with the new password hash and the FusionAuth data, maintaining the same userId (if you provide the UUID, we'll use that)

I get that is an additional complexity, but hopefully that helps.

]]>https://fusionauth.io/community/forum/post/8524https://fusionauth.io/community/forum/post/8524Wed, 11 Mar 2026 17:20:38 GMT