The **postman‑sandbox** library provides a unified runtime that safely executes third‑party JavaScript—such as Pre‑request and Test scripts used in Postman collections—within both Node.js and browser environments. It supplies the full `pm` API (tests, globals, environment, visualizer, request sending, etc.) and emits detailed execution events, but is intended to be used as a component of Postman’s own runtime (e.g., via Newman) rather than as a standalone tool. This project is aimed at developers building or extending Postman‑compatible tooling that needs to run collection scripts programmatically.