Html-parser on Node.js

javascript

headless-browser

parsing-speed

html-parser

byAlex Kataev·Oct 25, 2024

To get started quickly, cheerio is your best bet for HTML parsing in Node.js. It's easy to use and feels just like jQuery. To install:

npm install cheerio

With cheerio, simply load your HTML content and use jQuery-like selectors:

const cheerio = require('cheerio');
const $ = cheerio.load('<h1>Title</h1>');

const title = $('h1').text();  // "Title", just like magic... without the wand!
console.log(title);

Fast, simple, and elegant. It's like bringing the jQuery experience to the server-side.

Terminators vs Transformers: choosing the right tool

Fast and Furious: htmlparser2 for speed

Your parsing job is the size of Optimus Prime and you need speed? htmlparser2 offers a streaming interface, reducing memory usage and boosting parsing speed:

const htmlparser2 = require('htmlparser2');
const parser = new htmlparser2.Parser({
    onopentag(name) {
        console.log(name); // "div", no autobot detected!
    },
});
parser.write("Your HTML here");
parser.end();

Web standard Cop: parse5 for compliance

You're more of a rules person? The parse5 parser walks the line, implementing the WHATWG HTML parsing algorithm like a dedicated patrolman:

const parse5 = require('parse5');
const document = parse5.parse('<div class="block">Content</div>'); // Your HTML block just got parsed!

Battling dynamic content: Summon your headless browsers

Dealing with dynamic content loaded via JavaScript? Swap that simple parser for a headless browser:

PhantomJS: The old guard, even though it's not actively maintained, can still ride into battle:
```
npm install phantomjs-prebuilt
```
Puppeteer: Backing from Google and a modern alternative for rescuing damsel-in-distress webpages:
```
npm install puppeteer
```