JWT Debugger & Inspector
Decode JSON Web Tokens (JWT) instantly, inspect Header & Payload claims, and check expiration status.
HEADER: Algorithm & Token Type
{}SIGNATUREHMACSHA256( base64UrlEncode(header) + "." + base64UrlEncode(payload), secret )
The signature verifies token integrity. Since your secret key remains private on your backend, decoding claims in browser is completely safe. 🔒 Privacy & Security: The token you paste is never sent to any server. Decoding happens 100% locally in your browser. How to Decode a JWT Token?
1
Paste your JWT into the input field.
2
The debugger splits the token into Header (Pink), Payload (Purple), and Signature (Blue).
3
Inspect claims, user IDs, roles, and scopes formatted in clean JSON.
4
Check the expiration timer to verify whether the token has expired.
Are my sensitive credentials safe?
Yes, 100% safe. Processing is entirely client-side with zero network requests.
How is expiration computed?
The 'exp' field contains Unix epoch seconds, which our tool compares in real-time to your local system clock.