JWT Token Generator

How to use

1. 1️⃣
   Choose your options above
2. 2️⃣
   Click Generate
3. 3️⃣
   Copy your result

Detailed instructions

1. Enter the subject field — a user ID or UUID that identifies who the token belongs to.
2. Select a role from the dropdown to set the access level encoded in the payload.
3. Set the expiry window in hours to control how long the token appears to be valid.
4. Click Generate to produce a three-part JWT string ready to copy.
5. Paste the token into your Authorization header, test fixture, or jwt.io to inspect the decoded payload.

Use Cases

• •Populating a Bearer token in Postman environment variables to test protected REST endpoints without touching a live IdP
• •Stubbing JWT middleware in Jest or Pytest so unit tests never spin up a real identity provider
• •Generating an admin-role token to confirm unauthorized users receive a 403 on restricted Express or FastAPI routes
• •Wiring up a Next.js frontend that reads role and expiry claims before an auth backend exists
• •Demoing a role-based dashboard to a client without requiring a working login flow or live secrets

Tips

• →Generate one admin token and one user token for the same subject ID to test both sides of a permission check in a single test suite.
• →Set expiry to 0.01 hours (about 36 seconds) to simulate an expired token and test how your app handles 401 responses.
• →Paste the generated token into jwt.io and verify the payload claims match what you configured — it confirms your parser is reading claims correctly.
• →Use a recognizable subject like `test_user_001` rather than random strings so tokens stay traceable across logs and test fixtures.
• →When seeding a test database, generate tokens with matching subject IDs for each user record so auth middleware resolves to the right account.
• →If your middleware checks multiple roles, generate a moderator token alongside admin and user tokens to cover the full access-control matrix.

FAQ