JWT Decoded Shows "signature invalid" / Verification Failed — Is That Normal?

JWT decoded but shows signature invalid or verification failed? Learn the difference between decode and verify, why it fails, and when you should just read the payload vs. actually verify.

API Testing: How to Send a Token and Fix CORS Errors

How to add an Authorization token when testing APIs online, and what to do about CORS / 405 / timeout errors? A step-by-step troubleshooting guide with our API tester.