Generate JWT tokens online using HS256 signing. Create header, payload, expiry claims, issuer, subject, audience, secret-based signature, and copy the token instantly.
Useful for API testing, authentication demos, backend debugging, OAuth learning, and development environments.
Enter JWT claims, add a secret key, and generate a signed HS256 JSON Web Token in your browser.
Header JSON will appear here.
Payload JSON will appear here.
| Claim | Value | Meaning |
|---|---|---|
| JWT claims will appear here after generating. | ||
A JWT Generator helps you create test tokens for API authentication, backend debugging, and development workflows.
Generate HS256 signed JWT tokens using a custom secret key and readable payload claims.
Include iat, exp, issuer, subject, audience, role, permissions, and custom claims.
Copy the raw JWT or Authorization Bearer format for API testing tools and backend requests.
JWT generation creates a JSON Web Token from a header, payload, and signature. The header usually contains the algorithm and token type, while the payload contains claims such as user ID, role, expiry, and issuer.
JWT tokens are commonly used for API authentication, session handling, authorization, OAuth flows, mobile apps, single-page apps, and backend service communication.
| Claim | Purpose | Example |
|---|---|---|
| sub | Subject or user ID | 1001 |
| iss | Token issuer | example.com |
| aud | Token audience | api-users |
| iat | Issued at time | Unix timestamp |
| exp | Expiration time | Unix timestamp |
Generate a JWT token in three simple steps.
Enter subject, issuer, audience, name, role, expiry time, and optional custom JSON payload.
Add a secret key and the tool signs the token using HS256 with browser Web Crypto.
Copy the token, copy Bearer format, download JSON output, or use it in API testing tools.
Common questions about JWT generation, HS256 signing, claims, expiry, and token security.