JWT Generator

Generate debug-friendly JWTs in your browser. Create `alg=none` or `HS256` tokens and inspect the header, payload, and signature segments together.

Sample templates

Everything runs locally in the browser, and the generated JWTs are intended for debugging or demo workflows.

Do not paste production secrets into a browser-based generator. This tool is convenient for local testing, sample responses, and QA flows, but it does not provide the same security guarantees as a real token issuing service.
Enter header and payload JSON to generate a JWT automatically with the current settings.

JWT generator guide

A JWT generator is useful when you need disposable tokens for API testing, local auth flows, mocked responses, demos, or QA scenarios. In frontend and backend integration work, it is common to tweak `iss`, `aud`, `sub`, `scope`, and expiry claims many times before the final auth system is wired up. This tool focuses on making that loop fast by letting you edit JSON, generate a token, and copy the result immediately in the browser.

When this tool is especially useful

  • Creating access-token-shaped sample values for local development
  • Preparing debug JWT examples for API documentation or Postman collections
  • Tweaking exp, nbf, and iat claims to reproduce auth timing edge cases
  • Showing the difference between unsigned `alg=none` tokens and HS256 tokens

Important limits

  • This is a developer convenience tool, not a replacement for a production issuer.
  • Entering HS256 secrets in the browser is fine for local testing but not for real production secrets.
  • A generated token still needs to match your real server rules for issuer, audience, secret, and algorithm policy.

Related developer tools

JWT Decoder

Useful for immediately decoding the token you generated and verifying the header and payload.

Timestamp Converter

Helpful when checking exp, iat, and nbf claims as readable dates.

JSON Formatter

A good companion when you want to clean up or validate more complex payload JSON.

Frequently Asked Questions

The current version supports `alg=none` and `HS256`, which covers common debug and demo workflows. HS256 signing is performed with the browser's Web Crypto API.
Not necessarily. Your real service may require specific issuer, audience, kid, secret, expiration, or algorithm settings, so final verification should still happen against the real environment.
Browsers are great for convenience, not for long-term secret handling. Production secrets should stay in trusted server-side environments or secure secret management systems.
No. JSON parsing and HS256 signing happen locally in your browser only.