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    htmlparser2
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    6.1.0 • Public • Published

    htmlparser2

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    The fast & forgiving HTML/XML parser.

    Installation

    npm install htmlparser2
    

    A live demo of htmlparser2 is available here.

    Ecosystem

    Name Description
    htmlparser2 Fast & forgiving HTML/XML parser
    domhandler Handler for htmlparser2 that turns documents into a DOM
    domutils Utilities for working with domhandler's DOM
    css-select CSS selector engine, compatible with domhandler's DOM
    cheerio The jQuery API for domhandler's DOM
    dom-serializer Serializer for domhandler's DOM

    Usage

    htmlparser2 itself provides a callback interface that allows consumption of documents with minimal allocations. For a more ergonomic experience, read Getting a DOM below.

    const htmlparser2 = require("htmlparser2");
    const parser = new htmlparser2.Parser({
        onopentag(name, attributes) {
            /*
             * This fires when a new tag is opened.
             *
             * If you don't need an aggregated `attributes` object,
             * have a look at the `onopentagname` and `onattribute` events.
             */
            if (name === "script" && attributes.type === "text/javascript") {
                console.log("JS! Hooray!");
            }
        },
        ontext(text) {
            /*
             * Fires whenever a section of text was processed.
             *
             * Note that this can fire at any point within text and you might
             * have to stich together multiple pieces.
             */
            console.log("-->", text);
        },
        onclosetag(tagname) {
            /*
             * Fires when a tag is closed.
             *
             * You can rely on this event only firing when you have received an
             * equivalent opening tag before. Closing tags without corresponding
             * opening tags will be ignored.
             */
            if (tagname === "script") {
                console.log("That's it?!");
            }
        },
    });
    parser.write(
        "Xyz <script type='text/javascript'>const foo = '<<bar>>';</ script>"
    );
    parser.end();

    Output (with multiple text events combined):

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

    This example only shows three of the possible events. Read more about the parser, its events and options in the wiki.

    Usage with streams

    While the Parser interface closely resembles Node.js streams, it's not a 100% match. Use the WritableStream interface to process a streaming input:

    const { WritableStream } = require("htmlparser2/lib/WritableStream");
    const parserStream = new WritableStream({
        ontext(text) {
            console.log("Streaming:", text);
        },
    });
    
    const htmlStream = fs.createReadStream("./my-file.html");
    htmlStream.pipe(parserStream).on("finish", () => console.log("done"));

    Getting a DOM

    The DomHandler produces a DOM (document object model) that can be manipulated using the DomUtils helper.

    const htmlparser2 = require("htmlparser2");
    
    const dom = htmlparser2.parseDocument();

    The DomHandler, while still bundled with this module, was moved to its own module. Have a look at that for further information.

    Parsing RSS/RDF/Atom Feeds

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

    Note: While the provided feed handler works for most feeds, you might want to use 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, 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 (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?

    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). 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 (originally targeted at 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. Tidelift will coordinate the fix and disclosure.

    htmlparser2 for enterprise

    Available as part of the Tidelift Subscription

    The maintainers of htmlparser2 and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. Learn more.

    Install

    npm i htmlparser2

    DownloadsWeekly Downloads

    16,671,091

    Version

    6.1.0

    License

    MIT

    Unpacked Size

    106 kB

    Total Files

    24

    Last publish

    Collaborators

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