JWT Generator
Create signed HS256 JSON Web Tokens directly in your browser. Build the payload, choose the header algorithm and expiration, and copy a correctly base64url-encoded token with its matching signature.
Category: Developer Tools
About this tool
What Is JWT Generator? The JWT Generator creates signed JSON Web Tokens entirely in your browser. You define the payload, choose the HS256 algorithm and an optional expiration time, and the tool assembles a three-part token — header, payload, and signature — that is base64url-encoded and ready to paste into your Authorization header. How It Works يتكوّن JWT من ثلاثة أجزاء مشفَّرة بـ base64url ومفصولة بنقاط: ترويسة تعلن الخوارزمية ({alg: HS256, typ: JWT})، وحمولة تحتوي على الادعاءات مثل iss و sub و exp، وتوقيع يُحسب على أنه HMAC-SHA256(secret, header.payload) باستخدام المفتاح السري الذي تقدمه. تعيد الأداة بناء الرمز كلما عدّلت الحمولة أو المفتاح، فيبقى الناتج مطابقًا لمدخلاته دائمًا. Worked Example Header {alg: HS256, typ: JWT}, payload {sub: 1234567890, name: Sara, admin: true, exp: 1760000000} and the secret my-secret produce a token that starts with eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9. . The signature covers the exact header and payload text, so any claim change produces a different signature. Common Use Cases test secured APIs during development generate sample tokens for documentation and demos sign JWTs for integration tests before wiring a real identity provider Important Notes Everything runs locally — the secret never leaves your browser a signature proves integrity, not identity: a weak or leaked secret is not authentication HS256 uses a shared secret; prefer RS256 or