Free JWT Decoder Online - Decode & Inspect JSON Web Tokens
Decode and inspect JSON Web Tokens (JWT) instantly in your browser. View Header and Payload sections with syntax highlighting. Check token expiration time and validity status. Perfect for debugging authentication issues, understanding token claims, and learning JWT structure. All decoding happens locally—your tokens are never sent to any server. Note: This tool does not verify signatures.
1When to use this tool?
💡Checking login token expiration time
💡Debugging user permission info in tokens
💡Learning JWT structure
2Features
- Decodes Header and Payload
- Syntax highlighting for JSON
- 100% client-side (No server upload)
- Error detection for invalid tokens
3How to Use
- Paste your JWT string into the input box.
- The token will be automatically decoded.
- Inspect the Header and Payload JSON data.
FAQ
Q. Does this verify the signature?
A. No, this tool only decodes the base64url encoded parts of the token. It does not verify the cryptographic signature.