JWT Generator | Create Signed Test Tokens
Create signed JWTs from custom header JSON, payload JSON, secret key, and algorithm settings for testing.
Create JWTs for Testing
Build a JSON Web Token from a header, payload, secret, and signing algorithm. It is useful for local API tests, documentation examples, mock authentication flows, and learning token structure.
Use Safe Test Secrets
Choose non-production secrets and sample claims when generating tokens. A token created in a browser tool should not replace server-side authentication or a secure identity provider.
Check Claims Before Copying
Review exp, iat, iss, aud, sub, roles, and custom claims before using the token in a test request. Incorrect timestamps or audience values are common causes of authentication failures.
About This Tool
JWT Generator builds a signed JSON Web Token from a payload you define and a secret key you provide. It is used by developers to create test tokens for API development, to build authentication flows, or to understand how JWT signing works.
When to Use It
Use this during API development to generate a test token with specific claims, when building a JWT integration and you need example tokens with known payloads, or when learning how the JWT format works.
How to Use
- Enter the header algorithm, typically HS256.
- Add the claims you need in the payload editor as JSON.
- Enter your secret key or paste a private key.
- Click Generate to produce the signed token.
- Copy the JWT and use it in your API requests.
Frequently Asked Questions
Is it safe to generate real production tokens here?
Do not use real production secrets in browser-based tools. Use this for test tokens and development work only.
What algorithm should I use for signing?
HS256 is the most common choice for symmetric signing with a shared secret. RS256 uses asymmetric keys and is preferred when the token will be verified by a service that should not hold the signing key.
What claims should I include in a JWT?
Standard claims include iss (issuer), sub (subject), aud (audience), exp (expiry), and iat (issued at). Add custom claims based on what your application needs.