phantomjs-prebuilt

What is phantomjs-prebuilt?

The phantomjs-prebuilt npm package provides a precompiled version of PhantomJS, a headless web browser scriptable with JavaScript. It is used for automating web page interaction, capturing screenshots, and running tests without a graphical user interface.

What are phantomjs-prebuilt's main functionalities?

Web Page Automation

This feature allows you to automate interactions with web pages, such as opening a URL and performing actions on the page.

const phantom = require('phantom');
(async function() {
  const instance = await phantom.create();
  const page = await instance.createPage();
  const status = await page.open('https://example.com');
  console.log(status);
  await instance.exit();
})();

Screenshot Capture

This feature enables you to capture screenshots of web pages, which can be useful for visual testing or archiving.

const phantom = require('phantom');
(async function() {
  const instance = await phantom.create();
  const page = await instance.createPage();
  await page.open('https://example.com');
  await page.render('screenshot.png');
  await instance.exit();
})();

PDF Generation

This feature allows you to generate PDF files from web pages, which can be useful for creating printable versions of web content.

const phantom = require('phantom');
(async function() {
  const instance = await phantom.create();
  const page = await instance.createPage();
  await page.open('https://example.com');
  await page.render('page.pdf');
  await instance.exit();
})();

Web Scraping

This feature allows you to scrape content from web pages, which can be useful for data extraction and analysis.

const phantom = require('phantom');
(async function() {
  const instance = await phantom.create();
  const page = await instance.createPage();
  await page.open('https://example.com');
  const content = await page.property('content');
  console.log(content);
  await instance.exit();
})();

Other packages similar to phantomjs-prebuilt

puppeteer

Puppeteer is a Node library which provides a high-level API to control Chrome or Chromium over the DevTools Protocol. It is more modern and actively maintained compared to PhantomJS, offering better support for modern web standards and features.

selenium-webdriver

Selenium WebDriver is a popular tool for automating web applications for testing purposes. It supports multiple browsers and is widely used in the industry. Unlike PhantomJS, Selenium WebDriver can control real browsers, providing more accurate test results.

nightmare

Nightmare is a high-level browser automation library built on Electron. It is designed for ease of use and is suitable for tasks like web scraping and UI testing. It offers a simpler API compared to PhantomJS and is more suitable for modern web applications.

README

phantomjs-prebuilt

An NPM installer for PhantomJS, headless webkit with JS API.

Building and Installing

npm install phantomjs-prebuilt

Or grab the source and

node ./install.js

What this installer is really doing is just grabbing a particular "blessed" (by this module) version of Phantom. As new versions of Phantom are released and vetted, this module will be updated accordingly.

Running

bin/phantomjs [phantom arguments]

And npm will install a link to the binary in node_modules/.bin as it is wont to do.

Running via node

The package exports a path string that contains the path to the phantomjs binary/executable.

Below is an example of using this package via node.

var path = require('path')
var childProcess = require('child_process')
var phantomjs = require('phantomjs-prebuilt')
var binPath = phantomjs.path

var childArgs = [
  path.join(__dirname, 'phantomjs-script.js'),
  'some other argument (passed to phantomjs script)'
]

childProcess.execFile(binPath, childArgs, function(err, stdout, stderr) {
  // handle results
})

Or exec() method is also provided for convenience:

var phantomjs = require('phantomjs-prebuilt')
var program = phantomjs.exec('phantomjs-script.js', 'arg1', 'arg2')
program.stdout.pipe(process.stdout)
program.stderr.pipe(process.stderr)
program.on('exit', code => {
  // do something on end
})

Note: childProcess.spawn() is called inside exec().

Running with WebDriver

run() method detects when PhantomJS gets ready. It's handy to use with WebDriver (Selenium).

var phantomjs = require('phantomjs-prebuilt')
var webdriverio = require('webdriverio')
var wdOpts = { desiredCapabilities: { browserName: 'phantomjs' } }

phantomjs.run('--webdriver=4444').then(program => {
  webdriverio.remote(wdOpts).init()
    .url('https://developer.mozilla.org/en-US/')
    .getTitle().then(title => {
      console.log(title) // 'Mozilla Developer Network'
      program.kill() // quits PhantomJS
    })
})

Versioning

The major and minor number tracks the version of PhantomJS that will be installed. The patch number is incremented when there is either an installer update or a patch build of the phantom binary.

Pre-2.0, this package was published to NPM as phantomjs. We changed the name to phantomjs-prebuilt at the request of PhantomJS team.

Continuous Integration

Please do not download PhantomJS for every CI job because it can quickly overload our CDNs. Instead take advantage of CI caching.

In Travis-CI add the following to your .travis.yml to enable caching & avoid repeated downloads of PhantomJS.

.travis.yml

cache:
  directories:
    - travis_phantomjs

before_install:
  # Upgrade PhantomJS to v2.1.1.
  - "export PHANTOMJS_VERSION=2.1.1"
  - "export PATH=$PWD/travis_phantomjs/phantomjs-$PHANTOMJS_VERSION-linux-x86_64/bin:$PATH"
  - "if [ $(phantomjs --version) != $PHANTOMJS_VERSION ]; then rm -rf $PWD/travis_phantomjs; mkdir -p $PWD/travis_phantomjs; fi"
  - "if [ $(phantomjs --version) != $PHANTOMJS_VERSION ]; then wget https://github.com/Medium/phantomjs/releases/download/v$PHANTOMJS_VERSION/phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2 -O $PWD/travis_phantomjs/phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2; fi"
  - "if [ $(phantomjs --version) != $PHANTOMJS_VERSION ]; then tar -xvf $PWD/travis_phantomjs/phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2 -C $PWD/travis_phantomjs; fi"
  - "phantomjs --version"

Deciding Where To Get PhantomJS

By default, this package will download phantomjs from our releases. This should work fine for most people.

Downloading from a custom URL

If github is down, or the Great Firewall is blocking github, you may need to use a different download mirror. To set a mirror, set npm config property phantomjs_cdnurl.

Alternatives include https://bitbucket.org/ariya/phantomjs/downloads (the official download site) and http://cnpmjs.org/downloads.

npm install phantomjs-prebuilt --phantomjs_cdnurl=https://bitbucket.org/ariya/phantomjs/downloads

Or add property into your .npmrc file (https://www.npmjs.org/doc/files/npmrc.html)

phantomjs_cdnurl=https://bitbucket.org/ariya/phantomjs/downloads

Another option is to use PATH variable PHANTOMJS_CDNURL.

PHANTOMJS_CDNURL=https://bitbucket.org/ariya/phantomjs/downloads npm install phantomjs

Using PhantomJS from disk

If you plan to install phantomjs many times on a single machine, you can install the phantomjs binary on PATH. The installer will automatically detect and use that for non-global installs.

Cross-Platform Repositories

PhantomJS needs to be compiled separately for each platform. This installer finds a prebuilt binary for your operating system, and downloads it.

If you check your dependencies into git, and work on a cross-platform team, then you need to tell NPM to rebuild any platform-specific dependencies. Run

npm rebuild

as part of your build process. This problem is not specific to PhantomJS, and this solution will work for any NodeJS package with native or platform-specific code.

If you know in advance that you want to install PhantomJS for a specific architecture, you can set the environment variables: PHANTOMJS_PLATFORM (to set target platform) and PHANTOMJS_ARCH (to set target arch), where platform and arch are valid values for process.platform and process.arch.

A Note on PhantomJS

PhantomJS is not a library for NodeJS. It's a separate environment and code written for node is unlikely to be compatible. In particular PhantomJS does not expose a Common JS package loader.

This is an NPM wrapper and can be used to conveniently make Phantom available. It is not a Node JS wrapper.

I have had reasonable experiences writing standalone Phantom scripts which I then drive from within a node program by spawning phantom in a child process.

Read the PhantomJS FAQ for more details: http://phantomjs.org/faq.html

Linux Note

An extra note on Linux usage, from the PhantomJS download page:

There is no requirement to install Qt, WebKit, or any other libraries. It however still relies on Fontconfig (the package fontconfig or libfontconfig, depending on the distribution).

Troubleshooting

Installation fails with spawn ENOENT

This is NPM's way of telling you that it was not able to start a process. It usually means:

• node is not on your PATH, or otherwise not correctly installed.
• tar is not on your PATH. This package expects tar on your PATH on Linux-based platforms.
• bzip2 is not on your PATH.

Check your specific error message for more information.

Installation fails with Error: EPERM or operation not permitted or permission denied

This error means that NPM was not able to install phantomjs to the file system. There are three major reasons why this could happen:

• You don't have write access to the installation directory.
• The permissions in the NPM cache got messed up, and you need to run npm cache clean to fix them.
• You have over-zealous anti-virus software installed, and it's blocking file system writes.

Installation fails with Error: read ECONNRESET or Error: connect ETIMEDOUT

This error means that something went wrong with your internet connection, and the installer was not able to download the PhantomJS binary for your platform. Please try again.

I tried again, but I get ECONNRESET or ETIMEDOUT consistently.

Do you live in China, or a country with an authoritarian government? We've seen problems where the GFW or local ISP blocks github, preventing the installer from downloading the binary.

Try visiting the download page manually. If that page is blocked, you can try using a different CDN with the PHANTOMJS_CDNURL env variable described above.

I am behind a corporate proxy that uses self-signed SSL certificates to intercept encrypted traffic.

You can tell NPM and the PhantomJS installer to skip validation of ssl keys with NPM's strict-ssl setting:

npm set strict-ssl false

WARNING: Turning off strict-ssl leaves you vulnerable to attackers reading your encrypted traffic, so run this at your own risk!

I tried everything, but my network is b0rked. What do I do?

If you install PhantomJS manually, and put it on PATH, the installer will try to use the manually-installed binaries.

I'm on Debian or Ubuntu, and the installer failed because it couldn't find node

Some Linux distros tried to rename node to nodejs due to a package conflict. This is a non-portable change, and we do not try to support this. The official documentation recommends that you run apt-get install nodejs-legacy to symlink node to nodejs on those platforms, or many NodeJS programs won't work properly.

I'm using an unsupported version of Linux or an ARM processor. I get errors about "Unexpected platform or architecture". What do I do?

We only have binaries available for common OS / processor configurations. Sorry.

You may be able to get a PhantomJS binary from your operating system's package manager. Or you can build your own from source. If you put that binary on PATH, this installer will use it (see "Deciding Where to Get PhantomJS" above).

Contributing

Questions, comments, bug reports, and pull requests are all welcome. Submit them at the project on GitHub. If you haven't contributed to an Medium project before please head over to the Open Source Project and fill out an OCLA (it should be pretty painless).

Bug reports that include steps-to-reproduce (including code) are the best. Even better, make them in the form of pull requests.

Author

Dan Pupius (personal website) and Nick Santos, supported by A Medium Corporation.

License

Copyright 2012 A Medium Corporation.

Licensed under the Apache License, Version 2.0. See the top-level file LICENSE.txt and (http://www.apache.org/licenses/LICENSE-2.0).