JWT Generator

Create and sign JSON Web Tokens with HMAC algorithms, standard claims, custom payloads, and client-side signing.

🔐 JWT Generator

Create and sign JSON Web Tokens

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

Your secret never leaves your browser. All signing is done client-side using the Web Crypto API.

🔐

Fill in the fields above and click "Generate" to create a JWT

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What is a JWT Generator?

A JWT generator is a tool that creates and signs JSON Web Tokens (JWTs): the industry-standard format for securely transmitting claims between parties. JWTs are widely used for authentication, authorization, and API security. Each token consists of three parts: a header (algorithm and type), a payload (claims like user ID, issuer, and expiration), and a signature that verifies the token has not been tampered with.

CodeHelper's JWT Generator lets you build tokens visually with standard and custom claims, sign them with HMAC algorithms (HS256, HS384, HS512), and copy the result: all entirely in your browser using the Web Crypto API. Your secret key never leaves your machine.

Key Features

  • HMAC Signing: Sign tokens with HS256, HS384, or HS512 algorithms using the Web Crypto API.
  • Standard Claims: Set subject (sub), issuer (iss), audience (aud), expiration (exp), issued at (iat), and not before (nbf).
  • Expiration Presets: Quick presets for 1 hour, 6 hours, 24 hours, 7 days, 30 days, or 1 year.
  • Custom Claims: Add any JSON payload as custom claims (e.g., role, permissions, name).
  • Color-Coded Output: Header, payload, and signature are color-coded for easy visual inspection.

How to use the JWT Generator

  1. Select the signing algorithm (HS256, HS384, or HS512).
  2. Fill in standard claims: subject, issuer, audience, and expiration.
  3. Add custom claims as JSON if needed.
  4. Enter your secret key for signing.
  5. Click Generate to create the signed JWT.
  6. Copy the token for use in your application or API testing.

Whether you are testing API authentication, generating tokens for development, or learning how JWTs work, this free JWT generator creates properly signed tokens instantly with complete privacy.