Tech & Developer
Client-Side / Zero Latency
JWT Decoder & Token Inspector
Decode JSON Web Tokens (JWT) to inspect header algorithms, payload claims, expiration timestamps (exp), and issued-at dates.
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JSON Web Token (JWT) Decoder
Inspect claims, roles, scopes, and expiration dates inside encoded JWT authentication tokens without sending them over the wire.
Key Features:
- 100% in-browser token decoding: zero server logging.
- Human-readable expiration timestamps.
- Color-coded 3-part token breakdown.
How to Use:
- Paste your encoded JWT string (header.payload.signature).
- Review formatted JSON header and payload claims.
- Check token expiration countdown.
Security of In-Browser JWT Decoding
Because our decoder runs strictly client-side, your authorization tokens and private claims remain 100% confidential.
Frequently Asked Questions:
This tool decodes Base64Url claims. Signature verification requires the secret key or public certificate.