How to complete the challenge PUT /api/challenger/guid RESTORE

By Alan Richardson · Published 2026-07-31

First retrieve your progress with GET /api/challenger/{guid}.

Then send that JSON back to PUT /api/challenger/{guid} with Content-Type: application/json. When the URL GUID and payload challenger id match, the API restores the progress and returns 200.

Try it now

If you want to inspect the challenger payload first, get it with GET /api/challenger/{guid}. See the solution.

GET /api/challenger/{guid} to get the challenger payload

PUT /api/challenger/{guid} to restore challenger progress

Lessons Learned

• PUT /api/challenger/{guid} restores progress for an existing challenger from a saved JSON snapshot.
• A 200 OK restore should leave the guid stable while replacing progress data.
• Restoring progress is separate from restoring the todo database.

Suggested Experiments

• Complete a challenge, restore an older progress snapshot, then inspect /api/challenges for rollback.
• Try restoring progress data to the right guid but with stale todo database data and compare what changes.

Experiment with this endpoint