Contextify is a Node.js native addon that creates a full V8 execution context from a plain JavaScript object, letting that object serve as the global `this` for scripts run inside it. It adds `run`, `getGlobal`, and `dispose` methods, enabling synchronous and asynchronous code (e.g., `setTimeout`) to interact with the sandbox without the copy‑in/copy‑out overhead of Node’s built‑in `vm` module. The library is intended for developers needing isolated JavaScript environments on older Node versions (< 0.12); newer Node releases incorporate its functionality directly.