JWT Decoder
Decode and inspect JWT tokens — view header, payload, and signature details.
All processing happens in your browser. Your data never leaves your device.
How to Use
- 1Paste your JWT token into the input field.
- 2Click "Decode JWT" to inspect the token.
- 3View the decoded header and payload, plus expiration status.
What is JWT Decoder?
JWT Decoder decodes JSON Web Tokens (JWT) to inspect their header and payload. JWTs are commonly used for authentication and information exchange. The header contains the algorithm type, and the payload contains the claims (data).
Key Features
- Decodes header and payload instantly
- Shows token expiration status
- Supports URL-safe Base64
- Detects invalid token structure
- 100% client-side — token never sent to server
JWT Decoder vs Other Tools
| Feature | JWT Decoder | Other Tools |
|---|---|---|
| Client-side processing | Yes | Varies |
| No signup required | Yes | Often required |
| Privacy-first (no data sent) | Yes | Rarely |
| Free & unlimited | Yes | Often limited |
| No ads interruption | Yes | Often no |
FAQ
What is a JWT?
JWT (JSON Web Token) is a compact, URL-safe token format for representing claims between parties. It consists of three parts: header, payload, and signature, each Base64URL encoded.
Is it safe to decode JWT tokens?
Yes, decoding a JWT is safe since it's just Base64URL decoding. However, you should never trust the payload data without verifying the signature. JWT decoding is not the same as JWT validation.