A node.js client for webdriver/selenium 2.
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node.js Webdriver/Selenium 2 client

Build Status Selenium Test Status

Selenium Test Status


npm install wd



0.2.x Release


  • New wrapper: promise chain.
  • Old chain api is deprecated (It is still available, but you will see a depreciation message).
  • There are some changes in the way the element and webdriver classes are passed around which may affect external wrappers. External wrappers should now subclass those 2 classes.


  • New test suite using the promise chain api.
  • browser.Q was moved to wd.Q.


  • chai-as-promised v4 compatible.
  • Promise wrappers can now be monkey patched directly.
  • New saucelabs helpers.


  • There is a new method to call, wd.rewrap(), to propagate async monkey patching to promise. (see here and the monkey patch section below)
  • The chai-as-promised setup has changed in v4, look out for the transferPromiseness (Requires chai-as-promised 4.1.0 or greater) line in the examples. (see here)

0.2.3 (In progress)

  • http retry functionality.


Q promises + chaining


    .should.become('WD Tests')
  .elementById('i am a link')
  .fin(function() { return browser.quit(); })

full code here

Pure async


browser.init({browserName:'chrome'}, function() {
  browser.get("http://admc.io/wd/test-pages/guinea-pig.html", function() {
    browser.title(function(err, title) {
      browser.elementById('i am a link', function(err, el) {
        browser.clickElement(el, function() {
          /* jshint evil: true */
          browser.eval("window.location.href", function(err, href) {

full code here

Q promises without chaining

See example here.

Generators Api


Yiewd is a wrapper around Wd.js that uses generators in order to avoid nested callbacks, like so:

wd.remote(function*() {
  yield this.init(desiredCaps);
  yield this.get("http://mysite.com");
  el = yield this.elementById("someId");
  yield el.click();
  el2 = yield this.elementById("anotherThing")
  text = yield el2.text();
  text.should.equal("What the text should be");
  yield this.quit();

Mocha integration


describe("using mocha-as-promised and chai-as-promised", function() {
  var browser;

  before(function() {
    browser = wd.promiseChainRemote();

    return browser.init({browserName:'chrome'});

  beforeEach(function() {
    return browser.get("http://admc.io/wd/test-pages/guinea-pig.html");

  after(function() {
    return browser.quit();

  it("should retrieve the page title", function() {
    return browser.title().should.become("WD Tests");

  it("submit element should be clicked", function() {
    return browser.elementById("submit").click().eval("window.location.href")

example here


./node_modules/.bin/wd shell
): wd shell
> x = wd.remote() or wd.remote("ondemand.saucelabs.com", 80, "username", "apikey")

> x.init() or x.init({desired capabilities override})
> x.get("http://www.url.com")
> x.eval("window.location.href", function(e, o) { console.log(o) })
> x.quit()




full json wire mapping


WD is simply implementing the Selenium JsonWireProtocol, for more details see the official docs:

Browser initialization

Indexed parameters

var browser = wd.remote();
// or
var browser = wd.remote('localhost');
// or
var browser = wd.remote('localhost', 8888);
// or
var browser = wd.remote("ondemand.saucelabs.com", 80, "username", "apikey");

Named parameters

The parameters used are similar to those in the url module.

var browser = wd.remote()
// or
var browser = wd.remote({
  hostname: '',
  port: 4444,
  user: 'username',
  pwd: 'password',
// or
var browser = wd.remote({
  hostname: '',
  port: 4444,
  auth: 'username:password',

The following parameters may also be used (as in earlier versions):

var browser = wd.remote({
  host: '',
  port: 4444,
  username: 'username',
  accessKey: 'password',

Url string

var browser = wd.remote('http://localhost:4444/wd/hub');
// or
var browser = wd.remote('http://user:apiKey@ondemand.saucelabs.com/wd/hub');

Url object created via url.parse

URL module documentation

var url = require('url');
var browser = wd.remote(url.parse('http://localhost:4444/wd/hub'));
// or
var browser = wd.remote(url.parse('http://user:apiKey@ondemand.saucelabs.com:80/wd/hub'));


    protocol: 'http:'
    hostname: '',
    port: '4444'
    path: '/wd/hub'

Element function chaining (using promise chains)

With the promise chain api the method from the browser prototype and the element prototype are all available within the browser instance, so it might be confusing at first. However we tried to keep the logic as simple as possible using the principles below:

  • There is no state passed between calls, except for what the method returns.
  • If the method returns an element the element scope is propagated.
  • If the method returns nothing (click, type etc...) we make the method return the current element, so the element scope is propagated.
  • If the method returns something (text, getAttribute...), the element scope is lost.
  • You may use "<" as the first parameter to get out of the element scope.
  • You may use ">" as the first parameter to force the call to be done within the current context (mainly used to retrieve subelements).

If you need to do something more complicated, like reusing an element for 2 calls, then can either Q promise functionnality (like then, Q.all or Q sequences), or retrieve your element twice (since the promise chain api is very terse, this is usually acceptable).

Element function chaining example here

Monkey patching

You may want to monkey patch the webdriver class in order to add custom functionalities. Please refer to the following examples:

Caveat: You now need to call wd.rewrap() to propagate async monkey patching to the promise wrapper. This will ovewrite the promise wrapper prototype, so you need to do your monkey patching in order, async first, call wd.rewrap() , and only then promise.

Promise helpers

This is a clean alternative to monkey patching. See example here.

Http configuration

Http behaviour may be configured via the browser configureHttp method as in the code below:

  timeout: 60000,
  retries: 3,
  retryDelay: 100
  • timeout: http timeout in ms, default is undefined (uses the server timeout, usually 60 seconds). Use 'default' or undefined for server default.
  • retries: Number of reconnection attempts in case the connection is dropped. Default is 3. Pass 0 or always to keep trying. Pass -1 or never to disable.
  • retryDelay: the number of ms to wait before reconnecting. Default is 15.
  • If a field is not specified, the current configuration for this field is unchanged.

Environment variables for Saucelabs

When connecting to Saucelabs, the user and pwd fields can also be set through the SAUCE_USERNAME and SAUCE_ACCESS_KEY environment variables.

The following helper are also available to update sauce jobs: sauceJobUpdate and sauceJobStatus.

Safe Methods

The safeExecute and safeEval methods are equivalent to execute and eval but the code is executed within a eval block. They are safe in the sense that eventual code syntax issues are tackled earlier returning as syntax error and avoiding browser hanging in some cases.

An example below of expression hanging Chrome:

browser.eval("wrong!!!", function(err, res) { // hangs
browser.safeEval("wrong!!!", function(err, res) { // returns
browser.execute("wrong!!!", function(err, res) { //hangs
browser.safeExecute("wrong!!!", function(err, res) { //returns

Run the tests!

# Install the Selenium server, Chromedriver connect

#Run the selenium server with chromedriver:

cd wd
npm install
make test

# look at the results!

Run the tests on Sauce Labs cloud!

# Install Sauce Connect

# Set the following env variales: SAUCE_USERNAME and SAUCE_ACCESS_KEY 

# Start Sauce Sonnect:

cd wd
npm install
make test_e2e_sauce # may be run without sauce connect
make test_midway_sauce_connect

# look at the results on Saucelabs site!

Adding new method / Contributing

If the method you want to use is not yet implemented, that should be easy to add it to lib/webdriver.js. You can use the doubleclick method as a template for methods not returning data, and getOrientation for methods which returns data. No need to modify README as the doc generation is automated. Other contributions are welcomed.

Generating doc

The JsonWire mappings in the README and mapping files are generated from code comments using dox.

To update the mappings run the following commands:

make mapping > doc/jsonwire-mapping.md
make full_mapping > doc/jsonwire-full-mapping.md
make unsupported_mapping > doc/jsonwire-unsupported-mapping.md


npm version [patch|minor|major]
git push --tags
npm publish

Test Coverage

test coverage