JWT Decoder — Free Online Tool
Decode and inspect JSON Web Tokens (JWT) instantly. View header, payload, and expiration status.
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Use JWT DecoderQuick Facts
- 100% free — no signups
- Client-side processing
- No file size limits
- Works on all devices
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What is a JWT Token?
JSON Web Tokens (JWT) are compact, URL-safe tokens used for authentication and information exchange. They contain three parts: header, payload, and signature.
JWT Structure
A JWT has three Base64-encoded parts separated by dots: HEADER.PAYLOAD.SIGNATURE
- Header: Token type and signing algorithm (e.g., HS256)
- Payload: Claims — user data, expiration, issuer
- Signature: Verifies token integrity (requires secret key)
Common JWT Claims
- sub: Subject (user ID)
- exp: Expiration time (Unix timestamp)
- iat: Issued at time
- iss: Issuer
- aud: Audience
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