JWT Generator

Generate JSON Web Tokens (JWT) online for free. Set payload, expiry, and algorithm — sign with a secret key. For testing and development.

Runs entirely in your browser — files never uploaded

Subject (sub)

Name

Issued At (iat)

Expires (exp)

Custom fields (JSON, without outer braces)

Secret Key

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1778695114,
  "exp": 1778698714
}

How to use JWT Generator

1. Set claims. Enter subject, name, issued-at, expiry, and any custom fields.
2. Enter secret. Type a secret key for HMAC-SHA256 signing.
3. Generate. Click Generate to create a signed JWT token.

Which algorithm is used?

HS256 (HMAC-SHA256). This is suitable for testing and development.

Should I use this in production?

This tool is for development and testing. In production, use a proper JWT library with secure key management.

Is my secret uploaded?

No. All signing happens in your browser using the Web Crypto API.