Node.js VM Module
Example
Run some JavaScript code in a "virtual machine":
var vm = require('vm');
var myObj = { name: 'John', age: 38 };
vm.createContext(myObj);
vm.runInContext('age += 1;', myObj);
console.log(myObj);
Run example »
Definition and Usage
The VM module provides a way of executing JavaScript on a virtual machine, almost like eval() in JavaScript.
Syntax
The syntax for including the VM module in your application:
var vm = require('vm');
VM Properties and Methods
| Method | Description |
|---|---|
| createContext() | Prepares a virtual machine, or sandbox, where you can execute scripts |
| isContext() | Returns true if the specified sandbox has been created by the createContext() method |
| runInContext() | Executes JavaScript code in the specified context, and returns the result |
| runInDebug() | Executes JavaScript inside the debug context |
| runInNewContext() | Executes JavaScript code in a new context, and returns the result |
| runInThisContext() | Executes JavaScript code in the global context, and returns the result |
