gistfile1.js

var vm = require('vm');

var context = {
    data: 123,
    run: function () {
        return this.data;
    }
}, result;

result = vm.runInNewContext('this.data', context);

console.log(result); // => 123

result = vm.runInNewContext('this.run()', context);

console.log(result); // => undefined