JWT Decoder
Decode JSON Web Tokens to view their header and payload.
JWT (JSON Web Token) Debugger
JSON Web Tokens (JWT) are the standard for secure information exchange in modern web apps. However, they are just Base64Url encoded strings—meaning they can be decoded to view their contents.
This tool allows developers to paste a JWT and instantly view its **Header**, **Payload**, and **Signature**. You can verify:
- **Expiration:** Check the 'exp' claim to see if a token is valid.
- **Claims:** Verify user roles, permissions, or IDs inside the token.
**Security Note:** Decoding happens entirely in your browser. We never see, store, or log your tokens.
Usage
- 1
Paste your JWT string.
- 2
View the decoded JSON payload instantly.
- 3
Check the claims and header information.
FAQ
Yes. Processing is 100% client-side. Your token never leaves your device.