JWT Builder
Create and sign JSON Web Tokens with custom payloads, or decode and verify existing tokens. All processing happens in your browser.
Input
Output
Result appears here
About JWT
- iat - Issued At: When the token was created
- exp - Expiration: When the token expires
- nbf - Not Before: Token not valid before this time
- sub - Subject: Who the token is about
- jti - JWT ID: Unique identifier for the token
JSON Web Tokens - Technical Details
JWTs are compact, URL-safe tokens for securely transmitting information between parties. They consist of three parts: header, payload, and signature. JWTs are commonly used for authentication and information exchange.
Command-line Alternative
# Decode JWT (without verification)\necho 'eyJ...' | cut -d'.' -f2 | base64 -d\n\n# Or use jwt-cli\nnpm install -g jwt-cli\njwt decode eyJ...