JWT Generator

JWT Generator is a developer-focused tool that creates signed JSON Web Tokens (JWTs) for API testing and Postman workflows. It accepts a header, a payload, and a signing key, then produces a compact token ready to paste into Authorization headers or test scripts. By standardizing the token structure, it helps teams reproduce authentication scenarios consistently.
It follows the JWT standard: header and payload are encoded using Base64URL, then signed with the selected algorithm (HS*, RS*). The output is a three-part string: header.payload.signature. The tool validates inputs, supports common claims (iss, sub, aud, exp, iat, nbf), and allows custom claims for tests. It runs locally, with no network requests, so tokens remain in your browser or environment.
Who benefits: API developers, QA engineers, security analysts, and DevOps teams who rely on Postman for API testing. Unique value: Postman-friendly workflow, algorithm flexibility, local generation, and easy import/export of header/payload; supports PEM keys; provides deterministic tokens for test reproducibility. Typical use cases include short-lived tokens for staging, tokens with specific audience claims, and tokens designed to exercise permission boundaries.