Here’s the Deal

Nightwatch.js vs WD.js

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When comparing Nightwatch.js vs WD.js, the Slant community recommends Nightwatch.js for most people. In the question“What are the best Node.JS Selenium WebDriver client libraries / bindings?” Nightwatch.js is ranked 5th while WD.js is ranked 8th. The most important reason people chose Nightwatch.js is:

Nightwatch solves the [Paradox of Choice](http://www.ted.com/talks/barry_schwartz_on_the_paradox_of_choice?language=en) among testing frameworks such as Jasmine, Cucumber or Mocha+Chai, by including its own BDD-style assertion library, based on Chai.

Ranked in these QuestionsQuestion Ranking

Common Questions

What are the best Node.JS Selenium WebDriver client libraries / bindings?

Pros

Pro
You don't have to choose a testing framework

Nightwatch solves the Paradox of Choice among testing frameworks such as Jasmine, Cucumber or Mocha+Chai, by including its own BDD-style assertion library, based on Chai.

Pro
Includes its own testing framework / assertions library

Pro
Test organization is out of the box

Supports page object model, custom commands, custom assertions, and globals.js.

Pro
3rd party integration with Cucumber

Though Cucumber is not officially supported, Nightwatch can be used with Cucumber.

Pro
Cleaner and more concise code than WebdriverJS

There is no need to pass the 'driver' instance around, and not as many parentheses.

Using WD.js

function login(username, password) {
    return this
        .waitForElementByCss('.loginForm', asserters.isDisplayed, seconds(explicit_wait))
        .elementById('emailAddress').sendKeys(username)
        .elementById('password').sendKeys(password)
        .elementById('signInButton').click()
}

Using WebDriverJS

function login(driver, username, password) {
    driver.wait(until.elementIsVisible(driver.findElement({css: '.loginForm'})),    seconds(explicit_wait));
    driver.findElement({id: 'emailAddress'}).sendKeys(username);
    driver.findElement({id: 'password'}).sendKeys(password);
    driver.findElement({id: 'signInButton'}).click();
}

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Cons

Con
No official BDD-style syntax support

Con
Includes its own testing framework / assertions library

Unlike WebdriverIO, which lets you use various test frameworks and assertion libraries (e.g. Jasmine, Cucumber, Mocha + Chai), Nightwatch comes with its own BDD-style interface for performing assertions, based on Chai.

Here's a simple test example:

module.exports = {
  'Demo test Google' : function (browser) {
    browser
      .url('http://www.google.com')
      .waitForElementVisible('body', 1000)
      .setValue('input[type=text]', 'nightwatch')
      .waitForElementVisible('button[name=btnG]', 1000)
      .click('button[name=btnG]')
      .pause(1000)
      .assert.containsText('#main', 'Night Watch')
      .end();
  }
};