JWT Generator
Generate JWT tokens with custom header, payload, and secret. Supports HS256 algorithm. Free online JWT token generator.
Header
Payload (Claims)
Secret Key
Frequently Asked Questions
What is a JWT token?
JWT (JSON Web Token) is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three parts separated by dots: header.payload.signature. JWTs are commonly used for authentication and authorization in web applications.
What algorithms are supported?
This tool supports HMAC algorithms: HS256 (HMAC-SHA256), HS384 (HMAC-SHA384), and HS512 (HMAC-SHA512). These use a shared secret key to sign the token. The "none" algorithm skips signing and should only be used for testing.
What are standard JWT claims?
Standard claims include: iss (issuer), sub (subject), aud (audience), exp (expiration time), nbf (not before), iat (issued at), and jti (unique JWT ID). You can also add any custom claims you need.
Is it safe to use tokens generated here?
Tokens generated here are suitable for testing and development. For production, use a proper backend library in your programming language. Never share your secret key, and always use HTTPS in production environments.
Is this tool free and private?
Yes, completely free with no sign-up required. All signing happens in your browser using the Web Crypto API. Your secret key and payload never leave your device.