App Token Decoder
Securely decode and read your login tokens (JWT). View exactly what data is stored inside them instantly in your browser, keeping your information 100% private.
JWT_LAB_PRO_v3
VERIFICATION_GATE
RECENT_FRAMES
History_Buffer_Empty
AUDIT_METRICS
PRO_TIP: STANDARD_CLAIMS
sub: Subject // iss: Issuer // aud: Audience // exp: Expiry // nbf: Not Before
Token Architecture
Local Decoding
Most online debuggers log your tokens. Ours runs 100% on your device, ensuring your secrets remain private and your sessions secure.
Structure Validation
Instantly identify malformed tokens, expired `exp` claims, or incorrect algorithm types that might be causing authentication failures.
Privacy Warning
Security Protocol: JWTs often contain sensitive user data. Always use local auditing tools like VaporLink instead of public web-based inspectors for production tokens.
What is the App Token Decoder?
The App Token Decoder (formerly known as a JWT Debugger) helps you translate hidden website login tokens into readable text. Websites use these tokens to securely log you in, and this tool lets you see exactly what information is stored inside them without sending your private data across the internet.
How to use it
- Paste your coded login token into the input box.
- The tool will instantly translate the token into readable text.
- Review the decoded 'Header' to see the security settings.
- Review the 'Payload' to see the actual user information (like your email or ID).
- If you have the secret password, you can verify if the token is authentic.
Common Use Cases
- >Checking what data a website knows about your session.
- >Verifying that your secure login token hasn't expired.
- >Finding out your unique user ID from a downloaded app token.