JWT Generator
Build and generate JSON Web Tokens (JWT) for development and testing. Choose algorithm, custom header and payload. Free, private, browser-based.
No sign-up • No server uploads • 100% browser-based
How It Works
1 Configure
Select the signing algorithm, edit the header and payload JSON, and provide a secret key for HMAC algorithms.
2 Generate
The tool base64url-encodes the header and payload, computes the HMAC signature using the Web Crypto API, and assembles the final JWT.
3 Copy & Use
Copy the generated token with one click. Use it in your API tests, development environment, or JWT debugging workflow.
Frequently Asked Questions
What algorithms are supported for JWT signing?
This tool supports HS256 (HMAC-SHA256), HS384 (HMAC-SHA384), HS512 (HMAC-SHA512), and unsigned tokens (alg: none). All signing is done locally using the Web Crypto API.
Can I use this for production JWTs?
This tool is intended for development and testing purposes. For production use, always use a proper server-side library with secure key management.
Is my secret key uploaded to a server?
No. All JWT generation and signing happens entirely in your browser. Your secret key never leaves your device.
What is the 'none' algorithm?
The 'none' algorithm produces an unsigned JWT with an empty signature. This is useful for testing but should never be used in production as it provides no integrity verification.
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