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require('vm') like in node but for the browser

branch: master


latest commit bfd7c5f59e
James Halliday authored January 28, 2014
Octocat-spinner-32 example runInNewContext example February 26, 2012
Octocat-spinner-32 test another test works fine January 28, 2014
Octocat-spinner-32 LICENSE license file, modernize the readme December 28, 2013
Octocat-spinner-32 index.js move win.eval creating logic up January 28, 2014
Octocat-spinner-32 package.json 0.0.4 January 28, 2014
Octocat-spinner-32 readme.markdown testling badge December 28, 2013


emulate node's vm module for the browser

testling badge


Just write some client-side javascript:

var vm = require('vm');

$(function () {
    var res = vm.runInNewContext('a + 5', { a : 100 });

compile it with browserify:

browserify entry.js -o bundle.js

then whip up some html:

    <script src=""></script>
    <script src="/bundle.js"></script>
    result = <span id="res"></span>

and when you load the page you should see:

result = 105


vm.runInNewContext(code, context={})

Evaluate some code in a new iframe with a context.

Contexts are like wrapping your code in a with() except slightly less terrible because the code is sandboxed into a new iframe.


This module is depended upon by browserify, so you should just be able to require('vm') and it will just work. However if you want to use this module directly you can install it with npm:

npm install vm-browserify



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