Free troubleshooting guides

Start with the problem and check the assumptions before applying a fix.

Debug an API response before retrying

Separate transport failures, HTTP errors and decoding errors, then choose a safe recovery path.

Trace CORS from preflight to readable response

Find which response fails, grant only trusted origins and distinguish CORS from cookie or transport failures.

Repair an npm dependency tree without hiding conflicts

Identify range, peer, lockfile and runtime mismatches before making a reviewed dependency change.