implementing-jwt-signing-and-verification

The code appears to be a legitimate JWT utility and contains no evident malware, data theft, or backdoor behavior. It has several security weaknesses: a hardcoded default HMAC secret, plaintext private-key output, unsafe unverified decoding, missing algorithm enforcement, uncaught parsing errors, and arbitrary report-file overwriting. These issues warrant remediation before production use. The fragment is also syntactically incomplete at the end.