# htmlparser2

[![NPM version](http://img.shields.io/npm/v/htmlparser2.svg?style=flat)](https://npmjs.org/package/htmlparser2)
[![Downloads](https://img.shields.io/npm/dm/htmlparser2.svg?style=flat)](https://npmjs.org/package/htmlparser2)
[![Build Status](http://img.shields.io/travis/fb55/htmlparser2/master.svg?style=flat)](http://travis-ci.org/fb55/htmlparser2)
[![Coverage](http://img.shields.io/coveralls/fb55/htmlparser2.svg?style=flat)](https://coveralls.io/r/fb55/htmlparser2)

A forgiving HTML/XML/RSS parser.
The parser can handle streams and provides a callback interface.

## Installation

    npm install htmlparser2

A live demo of htmlparser2 is available [here](https://astexplorer.net/#/2AmVrGuGVJ).

## Usage

```javascript
const htmlparser2 = require("htmlparser2");
const parser = new htmlparser2.Parser(
    {
        onopentag(name, attribs) {
            if (name === "script" && attribs.type === "text/javascript") {
                console.log("JS! Hooray!");
            }
        },
        ontext(text) {
            console.log("-->", text);
        },
        onclosetag(tagname) {
            if (tagname === "script") {
                console.log("That's it?!");
            }
        }
    },
    { decodeEntities: true }
);
parser.write(
    "Xyz <script type='text/javascript'>var foo = '<<bar>>';</ script>"
);
parser.end();
```

Output (simplified):

```
--> Xyz
JS! Hooray!
--> var foo = '<<bar>>';
That's it?!
```

## Documentation

Read more about the parser and its options in the [wiki](https://github.com/fb55/htmlparser2/wiki/Parser-options).

## Get a DOM

The `DomHandler` (known as `DefaultHandler` in the original `htmlparser` module) produces a DOM (document object model) that can be manipulated using the [`DomUtils`](https://github.com/fb55/DomUtils) helper.

The `DomHandler`, while still bundled with this module, was moved to its [own module](https://github.com/fb55/domhandler). Have a look at it for further information.

## Parsing RSS/RDF/Atom Feeds

```javascript
const feed = htmlparser2.parseFeed(content, options);
```

Note: While the provided feed handler works for most feeds, you might want to use [danmactough/node-feedparser](https://github.com/danmactough/node-feedparser), which is much better tested and actively maintained.

## Performance

After having some artificial benchmarks for some time, **@AndreasMadsen** published his [`htmlparser-benchmark`](https://github.com/AndreasMadsen/htmlparser-benchmark), which benchmarks HTML parses based on real-world websites.

At the time of writing, the latest versions of all supported parsers show the following performance characteristics on [Travis CI](https://travis-ci.org/AndreasMadsen/htmlparser-benchmark/builds/10805007) (please note that Travis doesn't guarantee equal conditions for all tests):

```
gumbo-parser   : 34.9208 ms/file ± 21.4238
html-parser    : 24.8224 ms/file ± 15.8703
html5          : 419.597 ms/file ± 264.265
htmlparser     : 60.0722 ms/file ± 384.844
htmlparser2-dom: 12.0749 ms/file ± 6.49474
htmlparser2    : 7.49130 ms/file ± 5.74368
hubbub         : 30.4980 ms/file ± 16.4682
libxmljs       : 14.1338 ms/file ± 18.6541
parse5         : 22.0439 ms/file ± 15.3743
sax            : 49.6513 ms/file ± 26.6032
```

## How does this module differ from [node-htmlparser](https://github.com/tautologistics/node-htmlparser)?

This module started as a fork of the `htmlparser` module.
The main difference is that `htmlparser2` is intended to be used only with node (it runs on other platforms using [browserify](https://github.com/substack/node-browserify)).
`htmlparser2` was rewritten multiple times and, while it maintains an API that's compatible with `htmlparser` in most cases, the projects don't share any code anymore.

The parser now provides a callback interface inspired by [sax.js](https://github.com/isaacs/sax-js) (originally targeted at [readabilitySAX](https://github.com/fb55/readabilitysax)).
As a result, old handlers won't work anymore.

The `DefaultHandler` and the `RssHandler` were renamed to clarify their purpose (to `DomHandler` and `FeedHandler`). The old names are still available when requiring `htmlparser2`, your code should work as expected.

## Security contact information

To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security).
Tidelift will coordinate the fix and disclosure.

[Get supported htmlparser2 with the Tidelift Subscription](https://tidelift.com/subscription/pkg/npm-htmlparser2?utm_source=npm-htmlparser2&utm_medium=referral&utm_campaign=readme)
