TinyToolHub
JWT Decoder
Decode and analyze JSON Web Tokens (JWT) instantly. View header, payload, and signature information with detailed token validation.
Enter a JWT token to see status information
Enter a JWT token to see timestamp information
Our free JWT decoder tool allows you to decode and analyze JSON Web Tokens (JWT) instantly. Perfect for developers, security professionals, and anyone working with JWT authentication systems.
Key Features:
- Real-time decoding: See decoded information as you paste your token
- Header analysis: View algorithm, token type, and other header information
- Payload inspection: Examine claims, user data, and token metadata
- Token validation: Check expiration and validity status
- Timestamp conversion: Human-readable date/time display
- Copy functionality: Easy copying of header and payload data
- Client-side processing: No data sent to servers for security
Common Use Cases:
- Debugging authentication issues
- Inspecting JWT tokens during development
- Verifying token claims and expiration
- Understanding JWT structure and format
- Security analysis and token validation
- API integration and testing
What is a JWT token?
JWT (JSON Web Token) is a compact, URL-safe means of representing claims between two parties. It consists of three parts: header, payload, and signature, separated by dots (.).
Is it safe to decode JWT tokens here?
Yes, all decoding happens in your browser using JavaScript. No data is sent to our servers. However, avoid pasting production tokens with sensitive information in public environments.
What information can I see in a JWT?
You can see the header (algorithm and token type), payload (claims like user info, expiration), and signature. Common claims include iss (issuer), sub (subject), aud (audience), exp (expiration), and iat (issued at).
Why does my token show as invalid?
A token may be invalid if it's expired (past the 'exp' claim), not yet valid (before 'nbf' claim), or has an invalid format. This tool only checks basic validity, not cryptographic signature verification.
Can this tool verify JWT signatures?
No, this tool only decodes the JWT structure. Signature verification requires the secret key or public key used to sign the token, which should never be shared publicly for security reasons.
What JWT algorithms are supported?
This decoder can display any JWT regardless of the algorithm used (HS256, RS256, ES256, etc.). The algorithm information is shown in the header section and token status panel.