Node vm.runInContext function | API Reference

code: string,

contextifiedObject: Context,

): any;

The vm.runInContext() method compiles code, runs it within the context of the contextifiedObject, then returns the result. Running code does not have access to the local scope. The contextifiedObject object must have been previously contextified using the createContext method.

If options is a string, then it specifies the filename.

The following example compiles and executes different scripts using a single contextified object:

import vm from 'node:vm';

const contextObject = { globalVar: 1 };
vm.createContext(contextObject);

for (let i = 0; i < 10; ++i) {
  vm.runInContext('globalVar *= 2;', contextObject);
}
console.log(contextObject);
// Prints: { globalVar: 1024 }

@param code

The JavaScript code to compile and run.

@param contextifiedObject

The contextified object that will be used as the global when the code is compiled and run.

@returns

the result of the very last statement executed in the script.