JWT Decoder
Decode and inspect JSON Web Tokens instantly. View the header, payload claims, and signature in a clean, readable format.
{
"alg": "HS256",
"typ": "JWT"
}{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022,
"exp": 1735258800,
"role": "admin",
"email": "john@example.com"
}SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5cThe signature is used to verify the token's authenticity. This tool does not perform signature verification.
What this tool does
Decodes JWT tokens into their three parts: header (algorithm info), payload (claims and data), and signature (verification data). Perfect for debugging authentication issues.
How to use it
Paste your JWT token in the input field. The tool automatically decodes it and displays the header and payload as formatted JSON. Use the tabs to toggle between formatted and raw views.
Privacy note
Your tokens never leave your browser. All decoding happens locally on your device. We don't store, log, or transmit any data you enter.
Important notice
This tool only decodes JWTs to inspect their contents. It does not verify signatures or validate token authenticity. Never trust a token solely based on decoded content.
What this tool is used for
A JWT decoder is useful when you need to inspect token claims during authentication and API debugging. It helps you read the header and payload quickly without writing a script or switching to another tool.
Developers commonly use a JWT decoder to check expiration times, issuer values, subject identifiers, roles, and custom claims. This is especially helpful when debugging login flows, authorization issues, or bearer token problems in staging and production.
Common use cases
- Inspect token payloads during authentication debugging
- Check standard claims like exp, iss, aud, and sub
- Understand the structure of a JWT returned by an API or identity provider