Security Tool
JWT Decoder
Decode JWT header and payload without verification. 100% client-side — no data is sent to any server.
🔒 All processing happens in your browser. No data is sent to any server.
How to use this JWT Decoder
Decoding JWT tokens is simple with our free online tool. Paste your JWT token into the input field above. The decoding happens automatically as you type.
The tool will display the decoded Header and Payload sections of your JWT. You can Copy each section individually or Download the complete decoded data as a JSON file.
What this JWT decoder does
- ✓Decode JWT header — View the algorithm and type claims.
- ✓Decode JWT payload — View the data claims stored in the token.
- ✓Extract claims — Automatically extract and display common claims.
- ✓Copy to clipboard — Copy header or payload individually.
- ✓Download as JSON — Download the complete decoded data.
- ✓100% client-side — All processing happens in your browser. No data is sent to servers.
Common use cases
- •Debug JWT tokens during API development and testing
- •Inspect authentication tokens for troubleshooting
- •Extract user information from JWT payloads
- •Verify the structure and content of JWT tokens
- •Analyze JWT claims for security auditing
- •Quickly check token expiration and issuance times
⚠️ Security Note
- •This tool does NOT verify signatures — use it for inspection only
- •Never share your JWTs — they may contain sensitive information
- •JWTs are base64 encoded — anyone can decode them without a key
- •Always use HTTPS when transmitting JWTs in production