JWT Token Debugger
Decode and inspect JSON Web Tokens — view header, payload, and expiry. Free, fast, and runs 100% in your browser.
When OAuth flows break or API authentication fails, inspecting the JWT token reveals the problem. This debugger decodes any JWT into its three components — header (algorithm), payload (claims), and signature — with human-readable timestamps for expiration checking.
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JWT Decoder
Decode and inspect JSON Web Tokens — view header, payload, expiry, and claims.
Feature Overview
| Feature | Details |
|---|---|
| Header decode | ✓ |
| Payload inspect | ✓ |
| Expiry check | ✓ |
| Privacy | 100% client-side |
Frequently Asked Questions
Can I debug expired tokens?
Yes. The debugger decodes any valid JWT regardless of expiration status and clearly shows the expiry timestamp.
Is it safe for production tokens?
Yes. Decoding happens entirely in your browser. Your tokens never leave your device.