cheerio

The fast, flexible, and elegant library for parsing and manipulating HTML and XML.

const cheerio = require('cheerio');
const $ = cheerio.load('<h2 class="title">Hello world</h2>');

$('h2.title').text('Hello there!');
$('h2').addClass('welcome');

$.html();
//=> <html><head></head><body><h2 class="title welcome">Hello there!</h2></body></html>

Installation

npm install cheerio

Features

❤ Proven syntax: Cheerio implements a subset of core jQuery. Cheerio removes all the DOM inconsistencies and browser cruft from the jQuery library, revealing its truly gorgeous API.

ϟ Blazingly fast: Cheerio works with a very simple, consistent DOM model. As a result parsing, manipulating, and rendering are incredibly efficient.

❁ Incredibly flexible: Cheerio wraps around parse5 for parsing HTML and can optionally use the forgiving htmlparser2. Cheerio can parse nearly any HTML or XML document. Cheerio works in both browser and server environments.

API

Loading

First you need to load in the HTML. This step in jQuery is implicit, since jQuery operates on the one, baked-in DOM. With Cheerio, we need to pass in the HTML document.

// ES6 or TypeScript:
import * as cheerio from 'cheerio';

// In other environments:
const cheerio = require('cheerio');

const $ = cheerio.load('<ul id="fruits">...</ul>');

$.html();
//=> <html><head></head><body><ul id="fruits">...</ul></body></html>

Selectors

Once you've loaded the HTML, you can use jQuery-style selectors to find elements within the document.

$( selector, [context], [root] )

selector searches within the context scope which searches within the root scope. selector and context can be a string expression, DOM Element, array of DOM elements, or cheerio object. root, if provided, is typically the HTML document string.

This selector method is the starting point for traversing and manipulating the document. Like in jQuery, it's the primary method for selecting elements in the document.

$('.apple', '#fruits').text();
//=> Apple

$('ul .pear').attr('class');
//=> pear

$('li[class=orange]').html();
//=> Orange

Rendering

When you're ready to render the document, you can call the html method on the "root" selection:

$.root().html();
//=>  <html>
//      <head></head>
//      <body>
//        <ul id="fruits">
//          <li class="apple">Apple</li>
//          <li class="orange">Orange</li>
//          <li class="pear">Pear</li>
//        </ul>
//      </body>
//    </html>

If you want to render the outerHTML of a selection, you can use the outerHTML prop:

$('.pear').prop('outerHTML');
//=> <li class="pear">Pear</li>

You may also render the text content of a Cheerio object using the text method:

const $ = cheerio.load('This is <em>content</em>.');
$('body').text();
//=> This is content.

The "DOM Node" object

Cheerio collections are made up of objects that bear some resemblance to browser-based DOM nodes. You can expect them to define the following properties:

tagName
parentNode
previousSibling
nextSibling
nodeValue
firstChild
childNodes
lastChild

Screencasts

https://vimeo.com/31950192

This video tutorial is a follow-up to Nettut's "How to Scrape Web Pages with Node.js and jQuery", using cheerio instead of JSDOM + jQuery. This video shows how easy it is to use cheerio and how much faster cheerio is than JSDOM + jQuery.

Cheerio in the real world

Are you using cheerio in production? Add it to the wiki!

Backers

Become a backer to show your support for Cheerio and help us maintain and improve this open source project.

Special Thanks

This library stands on the shoulders of some incredible developers. A special thanks to:

• @fb55 for htmlparser2 & css-select: Felix has a knack for writing speedy parsing engines. He completely re-wrote both @tautologistic's node-htmlparser and @harry's node-soupselect from the ground up, making both of them much faster and more flexible. Cheerio would not be possible without his foundational work

• @jQuery team for jQuery: The core API is the best of its class and despite dealing with all the browser inconsistencies the code base is extremely clean and easy to follow. Much of cheerio's implementation and documentation is from jQuery. Thanks guys.

• @tj: The style, the structure, the open-source"-ness" of this library comes from studying TJ's style and using many of his libraries. This dude consistently pumps out high-quality libraries and has always been more than willing to help or answer questions. You rock TJ.

License

MIT

iamanvicc / cheerio Goto Github PK

cheerio's Introduction