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err:unkey:data:project_already_exists
Another in your workspace already uses that slug. Nothing was created or changed. You get HTTP 409.
Example response

Likely causes

  • You called projects.createProject, or changed a slug with projects.updateProject, and the slug is taken.
  • 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 project.
In automation, treat a 409 as “already there” and read the project with projects.getProject.
Last modified on October 22, 2026