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err:unkey:data:app_already_exists
Another in the same project already uses that slug. Nothing was created or changed. You get HTTP 409.
Example response

Likely causes

  • You called apps.createApp, or changed an app’s slug with apps.updateApp, and the slug is taken in this project.
  • Two requests created the same slug at the same time, and this one lost.

How to fix

  1. Choose a different slug, or use the existing app.
Slugs only need to be unique within a project, so you can use the same slug in another project.
Last modified on October 6, 2026