JWT Token Decoder
Paste JWT Token
Decoded Token
How to Use JWT Decoder
Paste Your JWT Token
Paste the full JSON Web Token (three dot-separated Base64 segments) into the input box. The tool auto-decodes as you type for an instant result.
Inspect Header and Payload
The decoder displays the header (algorithm, token type) and payload (claims such as sub, iat, exp, roles) in a formatted, readable JSON panel.
Check Expiry and Copy Claims
The validation badge shows instantly whether the token has expired. Copy individual claim values to use in debugging, documentation, or API testing tools.
Free Online JWT Token Decoder
Inspect JWT Tokens Instantly
Debugging authentication? Paste your JSON Web Token to instantly see the algorithm, claims, expiration, and all payload data. The tool auto-decodes as you paste for the fastest debugging workflow without any additional steps.
Understand Token Expiration
The decoder automatically checks the exp claim and shows a clear badge indicating whether the token is still valid or has expired, along with the exact expiration date and time in a human-readable format.
Completely Private
JWT tokens contain sensitive user information including user IDs, roles, and permissions. This tool decodes everything in your browser: your tokens are never transmitted over the network or stored anywhere on our servers.
Understanding JWT Structure
A JSON Web Token consists of three Base64URL-encoded parts separated by dots: the Header (algorithm and token type), the Payload (claims and data), and the Signature (used to verify authenticity). This tool decodes the first two parts for inspection.
Frequently Asked Questions about JWT Decoder
A JSON Web Token (JWT) is a compact, URL-safe token used for securely transmitting information between parties. It consists of three parts: Header, Payload, and Signature, separated by dots.
This tool decodes and displays the Header and Payload sections of a JWT. Signature verification requires the secret key or public key, which is not performed client-side for security reasons.
The tool automatically reads the "exp" (expiration) claim from the payload and displays whether the token is currently valid, expired, or has no expiration set.
The decoder works with all JWT algorithms (HS256, RS256, ES256, etc.) since it only decodes the Base64-encoded header and payload without performing cryptographic verification.
Yes. The decoding happens entirely in your browser. Your token is never sent to any server. However, never share JWTs containing sensitive data in untrusted environments.