What is JWT Builder?
JWT Builder creates JSON Web Tokens with custom headers, payloads, and signatures. Define claims like expiration, issuer, and subject, then sign with a secret or generate example tokens.
Common Use Cases
API Testing
Create test tokens for authenticated endpoints.
Development
Generate tokens for local development.
Learning
Understand JWT structure by building tokens.
Documentation
Create example tokens for API docs.
How to Use This Tool
- Set the algorithm (HS256, RS256, etc.)
- Add payload claims (sub, iat, exp, etc.)
- Enter your signing secret
- Generate and copy the JWT
Guides & Tutorials
- How to Test JSON APIs Without Writing Code Format, validate, and read error bodies against RFC 9457 - no framework required.
Related Tools
Learn More
- RFC 7519 — JSON Web Token (JWT) The IETF specification that defines JSON Web Tokens.