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JWT Decoding vs Cryptographic Signature Verification: What Developers Can and Cannot Learn from a Token
Last Tuesday, a staging auth bug had three devs stumped for half an afternoon. Nginx was spitting 401 Unauthorized . But the tester dumped their Bearer token into Chrome's DevTools console, ran JSON.parse(atob(token.split('.')[1])) , and saw: { "sub" : "usr_9912" , "role" : "admin" , "exp"…