The original title is "JWT Malformed, Invalid Signature, or Expired? A Practical Debugging Checklist"

Short summary

A practical debugging checklist for common JWT errors covering malformed tokens, invalid signatures, and expiration. The guide separates token shape validation, signature verification, and claim validation into distinct steps with code examples. It also covers issuer/audience validation and includes a browser-based JWT error decoder tool.

• •Structured checklist for debugging malformed, invalid signature, and expired JWT errors
• •Covers algorithm mismatches, key encoding issues, and Unix time vs milliseconds for exp
• •Includes links to a browser-based JWT error decoder reference tool

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