JWT Debugger
Decode, inspect, and debug JWT tokens. Free API tool.
All processing happens in your browser. Your data never leaves your device.
How to Use
- 1Paste a JWT token.
- 2See decoded header and payload.
- 3Check token info and expiration.
What is JWT Debugger?
JWT Debugger is a free online API development tool that helps with request building, testing, and debugging.
Key Features
- Instant decode
- Header & payload view
- Expiration check
- Claims listing
- Error handling
- 100% client-side
JWT Debugger vs Other Tools
| Feature | JWT Debugger | 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 are API tools?
API tools help developers work with web APIs. They include request builders, cURL converters, HTTP status code references, and CORS header generators.
Do API tools send actual requests?
The API Request Builder generates request code (cURL, fetch, axios) but doesn't send requests directly. The Webhook Tester does send actual HTTP requests for testing purposes.