JWT Builder Tool
Create and sign JSON Web Tokens (JWT) directly in your browser. Select an algorithm, configure the header and payload, enter your secret key, and generate a valid signed JWT. Perfect for testing OAuth 2.0 APIs, generating test tokens, and learning JWT structure.
Quick Guide
- Select signing algorithm (HS256, HS384, HS512)
- Edit the payload JSON with your desired claims
- Enter your HMAC secret key
- Click “Build JWT” to generate a signed token
| Claim | Description | Example |
|---|---|---|
sub | Subject (user ID) | "1234567890" |
iss | Issuer | "https://auth.example.com" |
aud | Audience | "my-api" |
exp | Expiration (Unix timestamp) | 1735689600 |
iat | Issued At (Unix timestamp) | 1735603200 |
Click "Build JWT" to generate your token...
Privacy & Security
This JWT builder runs 100% in your browser using the Web Crypto API. Your secret key and payload data are never sent to any server. Safe for creating test tokens — but never use production secrets in any online tool.
