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Debugging Context: Supabase JWT 401 Auth Error

This document captures the exact, current state of our debugging efforts for the 401 Unauthorized API errors.

The Problem

All API requests (Garden, Weather, Tasks, Chat) are failing with a 401 Unauthorized. The FastAPI backend on Render is rejecting the Supabase JWT tokens sent by the frontend's Axios interceptor.

What we've discovered so far:

  1. The Secret Format: The SUPABASE_JWT_SECRET string from the Supabase dashboard (3OpM...4Q==) is a Base64 encoded string.
  2. The First Error: When PyJWT tried to use the raw SUPABASE_JWT_SECRET string, the signatures did not match (jwt.InvalidSignatureError).
  3. The Second Error: We added base64.b64decode() to decode the secret string in backend/utils/auth_utils.py. This resulted in a new error in the Render logs:

    [Auth ERROR] InvalidTokenError: InvalidAlgorithmError: The specified alg value is not allowed This implies PyJWT cannot use the decoded byte string for symmetric HMAC verification, likely because it misidentifies the key type.

The Current Fix (Commit 2f740f2)

In our latest push backend/utils/auth_utils.py does the following:

  1. It reads the raw (non-decoded) Secret string.
  2. It attempts to decode the token sequentially using multiple algorithms: HS256, HS384, and HS512.
  3. If all these symmetric algorithms fail, it uses jwt.get_unverified_header() to log the exact algorithm the token requires.

Next Steps on the New Laptop

1. Pull the Code Ensure you have the latest commit 2f740f2 where auth_utils.py has the multi-algorithm fallback logic.

2. Test the API again Open the Next.js app on the new laptop, log in, and try to view the Dashboard or send a Chat message.

3. Check Render Logs Go to your Render dashboard and look at the application logs for ourmind. You should see an output similar to this:

[Auth ERROR] All algorithms failed. Token header: alg=XXXXX, typ=JWT. Last error: ...

Give me that exact alg=XXXXX value.

Knowing the exact algorithm the token was signed with is the final piece of the puzzle to configure PyJWT correctly.