Générateur JWT
Create and sign JSON Web Tokens with HS256/384/512
100 % gratuit. Fonctionne entièrement dans votre navigateur : vos fichiers et données ne quittent jamais votre appareil et rien n'est envoyé à un serveur.
À propos de cet outil
Create and signs JSON Web Tokens (JWTs) using HS256/384/512 algorithms - useful for testing an API that expects a JWT, learning how JWT structure works, or generating a token for a development/testing environment without setting up a full authentication server.
Comment utiliser cet outil
- Define payload claimsSet subject, issuer, expiry, roles, and custom claims as needed.
- Choose signing algorithmSelect HS256/384/512 matching target API verification expectations.
- Sign token with secretGenerate JWT string and inspect decoded header/payload output.
- Test and verifyUse token in dev API requests and confirm auth behavior.
Pourquoi l’utiliser
- Speeds up API auth testing without full identity stack setup.
- Helps visualize JWT structure and claim behavior.
- Useful for QA, integration tests, and local debugging.
- Supports common HMAC JWT signing variants.
Usages courants
- Testing protected API endpoints in development.
- Simulating role-based tokens for frontend QA.
- Debugging claim parsing and expiry handling logic.
- Building auth test fixtures for automated integration suites.
Conseils pour de meilleurs résultats
- Use short expirations for testing security-sensitive flows.
- Never use production signing secrets in browser tools.
- Include only required claims to keep tokens minimal.
- Validate algorithm expectations on server to prevent misuse.
Erreurs à éviter
- Using generated dev tokens directly in production systems.
- Forgetting expiry claim and creating long-lived insecure tokens.
- Sharing JWTs publicly in logs or screenshots.
- Assuming unsigned/weakly signed tokens are safe for auth.
Questions fréquentes
This tool is best suited for testing, learning, and development purposes - for real production authentication, tokens should be generated and signed server-side using your application's actual secret keys and infrastructure, not a third-party browser tool.
They're the same HMAC-based signing approach using different hash functions (SHA-256, SHA-384, SHA-512) - higher numbers mean a longer, more computationally intensive signature, though HS256 is the most commonly used default across most systems.
Signing happens in your browser, but as a general precaution, use a test/throwaway secret key here rather than a real production secret, especially since JWTs are often used for actual authentication.
Yes. JWT Generator is free for normal use with no account required, and ToolBox does not add a watermark to your result.
Most tools in this category run in your browser so the file stays on your device. If a tool needs a temporary server job, files are handled for that job only and are not kept as a lasting archive.
No install needed. Open JWT Generator in your browser, add your file or paste your input, then download or copy the result.
Yes on modern mobile browsers. For large files, a desktop browser is usually faster and more reliable.
Try a different quality or format setting, use a smaller input, or open a related tool (for example compress before convert). Keep a copy of the original file before replacing it.
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