Table of Contents
Enter a JWT token to decode
Paste your JWT and click Decode
How to Use the JWT Decoder
Paste your JWT token into the input area. The tool automatically decodes the header and payload sections, displaying them as formatted JSON. It shows the token's expiration time, issuer, subject, and other claims. Note that the signature is verified but the tool does not store or transmit your tokens.
Features
ToolNova JWT Decoder offers:
- Automatic JWT header and payload decoding
- Formatted JSON display with syntax highlighting
- Expiration time and remaining validity
- Issuer, subject, and audience extraction
- Signature verification status
- 100% client-side processing
Why Decode JWTs?
Debugging authentication issues often requires inspecting JWT tokens to verify claims, check expiration times, and validate signatures. ToolNova JWT Decoder makes this process transparent and secure by keeping all processing in your browser.
Frequently Asked Questions
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe token format used for authentication and information exchange between parties.
Can I verify JWT signatures?
Yes. The tool checks the signature and shows whether it is valid, but for security reasons, signature verification is basic.
Are my tokens stored?
No. All decoding happens locally in your browser - tokens are never stored or sent to any server.
What claims does the tool show?
Standard claims like iss, sub, aud, exp, nbf, iat, jti, as well as any custom claims in the payload.