Does this JWT generator sign tokens securely?

For HS256 tokens, signing is done locally in your browser using Web Crypto. The tool is appropriate for generating test and development tokens, but you should still keep real signing keys under your own application security controls.

What algorithms are supported?

This version supports HS256 for HMAC-signed tokens and `alg: none` for unsigned local test tokens. It does not generate RSA or ECDSA-signed JWTs.

Can I generate custom claims?

Yes. The payload editor accepts any JSON object, so you can include standard claims like `iss`, `sub`, `aud`, `iat`, and `exp` along with your own custom claims.

Is my token data uploaded anywhere?

No. Header parsing, payload serialization, and HS256 signing all happen locally in your browser.

Why offer `alg: none`?

Unsigned tokens can be useful for local mock flows, UI previews, and educational testing where signature verification is not part of the scenario. They should not be used as a substitute for signed tokens in real authentication systems.

JWT Generator

Generate JWT tokens locally with JSON header and payload editors, HS256 signing, and unsigned test-token support. Perfect for authentication mocks, API integration testing, and local development workflows without external services.

jwt

token

security

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Quick Presets

Load common signed and unsigned JWT examples, then adjust the header, payload, and signing secret.

Input & Settings

Generate test JWTs locally from JSON header and payload objects using either `alg: none` or HS256 signing.

Algorithm

Secret Key

JWT Header JSON

JWT Payload JSON

How it works: The generator serializes your header and payload JSON, base64url-encodes both segments, then optionally signs the token with HS256 using Web Crypto. Everything happens locally in your browser.

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