JWT Decoder
Decode and inspect JWT (JSON Web Tokens) instantly with our free online tool.
All conversions happen in your browser. No data is sent to our servers. Press Cmd/Ctrl + Enter to convert.
How to Decode a JWT
Paste your JWT token into the input panel and click Convert. The decoder will parse and display the header, payload (claims), and signature separately with human-readable timestamps.
What is a JWT?
JSON Web Tokens (JWTs) are an open standard (RFC 7519) for securely transmitting information as a JSON object. They're commonly used for authentication and authorization in web applications and APIs.
JWT Structure
A JWT has three parts separated by dots: the header (algorithm and token type), the payload (claims/data), and the signature. The header and payload are Base64URL encoded JSON objects.
Common Use Cases
Decode JWTs when debugging authentication issues, inspecting token claims, checking expiration times, or understanding what data is being passed in API requests.
Frequently Asked Questions
What is a JWT?
JWT (JSON Web Token) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: header, payload, and signature.
Does this verify the signature?
No, this tool only decodes the token to show its contents. It does NOT verify the signature. Never trust a token's contents without server-side verification.
Is it safe to paste my JWT here?
Yes, all processing happens in your browser. The token is never sent to any server. However, treat JWTs like passwords - don't share production tokens publicly.
What claims are shown?
The decoder shows all claims in the payload including standard claims (iss, sub, aud, exp, nbf, iat, jti) with human-readable timestamps and expiration status.