JWT Builder

Build and sign JSON Web Tokens with custom payloads and algorithms.

Header (JSON)
Payload (JSON)
Generated JWT
Signature Options

Only HS256 is supported in client browser.

Secure Generation

Tokens are generated locally using the Web Crypto API. Your secret key never leaves your browser.

About this Tool

JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims to be transferred between two parties. A JWT consists of three parts: Header (algorithm and token type), Payload (claims/data), and Signature (verification). This builder allows you to create custom JWTs with various signing algorithms (HS256, HS384, HS512) for testing and development purposes.

Frequently Asked Questions

Previous
HTML Entity EncoderWeb Utilities
Next
MD5 GeneratorData & Security