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htmlparser2

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htmlparser2

Fast & forgiving HTML/XML/RSS parser

  • 3.9.0
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
27M
decreased by-15.86%
Maintainers
1
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Created

What is htmlparser2?

The htmlparser2 npm package is a fast and forgiving HTML and XML parser. It can parse HTML or XML into a DOM-like structure, which can then be manipulated or serialized. It is stream-based, which means it can handle large documents in a memory-efficient manner.

What are htmlparser2's main functionalities?

Parsing HTML to DOM

This feature allows you to parse HTML and handle different parts of the document as they are parsed. The example code sets up event handlers for opening tags, text content, and closing tags, and then parses a simple HTML string.

const htmlparser2 = require('htmlparser2');
const parser = new htmlparser2.Parser({
  onopentag(name, attributes) {
    console.log(name, attributes);
  },
  ontext(text) {
    console.log(text);
  },
  onclosetag(tagname) {
    console.log(tagname);
  }
}, { decodeEntities: true });
parser.write('<div class="test">Hello World</div>');
parser.end();

Streaming Interface

This feature allows you to parse HTML from a stream, such as a file or network response. The example code creates a readable stream from a file and pipes it to the htmlparser2 stream, which logs tag openings, text content, and tag closings.

const htmlparser2 = require('htmlparser2');
const fs = require('fs');
const parser = new htmlparser2.WritableStream({
  onopentag(name) {
    console.log('Opened tag:', name);
  },
  ontext(text) {
    console.log('Text:', text);
  },
  onclosetag(name) {
    console.log('Closed tag:', name);
  }
});
fs.createReadStream('example.html').pipe(parser);

DOM Tree Manipulation

This feature allows you to manipulate the DOM tree after parsing. The example code parses an HTML string into a DOM tree, changes the class attribute of the first element, and then serializes the modified element back to an HTML string.

const htmlparser2 = require('htmlparser2');
const dom = htmlparser2.parseDocument('<div class="test">Hello World</div>');
const divElement = dom.children[0];
divElement.attribs.class = 'new-class';
const serialized = htmlparser2.DomUtils.getOuterHTML(divElement);
console.log(serialized);

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Package last updated on 01 Dec 2015

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