JWT Generator
Generate signed JWT tokens with custom payloads and HMAC secret.
About this tool
JSON Web Tokens (JWT) are used for authentication, API authorization, and secure data exchange. This generator lets you create a signed JWT token by providing a secret key and a JSON payload. It uses HMAC-SHA256 to sign the token entirely in your browser.
How to use the JWT Generator
- Enter your HMAC secret key in the Secret Key field
- Edit the JSON payload or replace it with your own claims
- Click Generate to create the signed JWT token
- Copy the token to your clipboard for testing or development
Features
- Create HS256 signed JWT tokens
- Fully customizable JSON payload
- Client-side signing with Web Crypto API
- One-click copy to clipboard
- No server — your secret stays private
Frequently asked questions
Is this JWT generator free?
Yes. Generate signed JWT tokens instantly with no registration or cost.
Does my secret key leave my browser?
No. The HMAC signing is performed locally using the Web Crypto API. Your secret never leaves your device.
Which algorithm does it use?
It uses HMAC-SHA256 (HS256), the most common algorithm for JWT signing in development and testing.
Can I use the generated token in production?
For testing and development yes. For production, always rotate secrets and follow your identity provider's best practices.