🔧 Troubleshooting JWT Decoding & Signature Errors

Diagnose malformed token strings, expired timestamps, and invalid signature exceptions.

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Example Error & Fix

❌ Malformed Payload

eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0

✅ Corrected Payload

eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.signature_hash

💡 Explanation: A valid JWT must contain three dot-separated Base64URL parts: header, payload, and signature.

Common Root Causes

  • Token missing one of the three dot-separated segments.
  • Token payload contains invalid Base64URL characters.
  • Token expiration time ('exp') has passed.

Recommended Solutions

  • Ensure the full JWT string with all two dot separators is pasted.
  • Check that your authentication server issued a valid RFC 7519 token.

Frequently Asked Questions

Resolve debugging issues faster with these common answers.