JWT Decoder & Inspector
Free online JWT decoder. Decode JSON Web Tokens, inspect header and payload, check expiration. No signup required.
What is JWT Decoder?
JWT (JSON Web Token) is an open standard for securely transmitting information between parties as a JSON object. JWTs consist of three parts: header, payload, and signature. This decoder lets you inspect JWT contents without verification.
How to Use This JWT Decoder
1. Paste your JWT token. 2. Click 'Decode JWT'. 3. View the decoded header, payload, and signature. 4. Check token expiry status.
Common Errors
Common JWT issues include expired tokens, missing required claims, incorrect algorithms, and improper signature verification. Always validate signatures server-side.
Frequently Asked Questions
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