html-dom-parser

HTML to DOM parser that works on both the server (Node.js) and the client (browser):

HTMLDOMParser(string[, options])

The parser converts an HTML string to a JavaScript object that describes the DOM tree.

Example

const parse = require('html-dom-parser');
parse('<p>Hello, World!</p>');

Output

[
  Element {
    type: 'tag',
    parent: null,
    prev: null,
    next: null,
    startIndex: null,
    endIndex: null,
    children: [
      Text {
        type: 'text',
        parent: [Circular],
        prev: null,
        next: null,
        startIndex: null,
        endIndex: null,
        data: 'Hello, World!'
      }
    ],
    name: 'p',
    attribs: {}
  }
]

Replit | JSFiddle | Examples

Install

NPM:

npm install html-dom-parser --save

Yarn:

yarn add html-dom-parser

CDN:

<script src="https://unpkg.com/html-dom-parser@latest/dist/html-dom-parser.min.js"></script>
<script>
  window.HTMLDOMParser(/* string */);
</script>

Usage

Import the module with ES Modules:

import parse from 'html-dom-parser';

Or require the module with CommonJS:

const parse = require('html-dom-parser');

Parse empty string:

parse('');

Output:

[]

Parse string:

parse('Hello, World!');

Output

[
  Text {
    type: 'text',
    parent: null,
    prev: null,
    next: null,
    startIndex: null,
    endIndex: null,
    data: 'Hello, World!'
  }
]

Parse element with attributes:

parse('<p class="foo" style="color: #bada55">Hello, <em>world</em>!</p>');

Output

[
  Element {
    type: 'tag',
    parent: null,
    prev: null,
    next: null,
    startIndex: null,
    endIndex: null,
    children: [ [Text], [Element], [Text] ],
    name: 'p',
    attribs: { class: 'foo', style: 'color: #bada55' }
  }
]

The server parser is a wrapper of htmlparser2 parseDOM but with the root parent node excluded. The next section shows the available options you can use with the server parse.

The client parser mimics the server parser by using the DOM API to parse the HTML string.

Options (server only)

Because the server parser is a wrapper of htmlparser2, which implements domhandler, you can alter how the server parser parses your code with the following options:

/**
 * These are the default options being used if you omit the optional options object.
 * htmlparser2 will use the same options object for its domhandler so the options
 * should be combined into a single object like so:
 */
const options = {
    /**
     * Options for the domhandler class.
     * https://github.com/fb55/domhandler/blob/master/src/index.ts#L16
     */
    withStartIndices: false,
    withEndIndices: false,
    xmlMode: false,
    /**
     * Options for the htmlparser2 class.
     * https://github.com/fb55/htmlparser2/blob/master/src/Parser.ts#L104
     */ 
    xmlMode: false, // Will overwrite what is used for the domhandler, otherwise inherited.
    decodeEntities: true,
    lowerCaseTags: true, // !xmlMode by default
    lowerCaseAttributeNames: true, // !xmlMode by default
    recognizeCDATA: false, // xmlMode by default
    recognizeSelfClosing: false, // xmlMode by default
    Tokenizer: Tokenizer
};

If you are parsing HTML with SVG code you can set lowerCaseTags to true without having to enable xmlMode. Keep in mind this will return all tag names in camel-case and not the HTML standard of lowercase.

Note: If you are parsing code client-side (in-browser), you can not control the parsing options. Client-side parsing automatically handles returning some HTML tags in camel-case, such as specific SVG elements, but returns all other tags lowercased according to the HTML standard.

Testing

Run server and client tests:

npm test

Generate HTML coverage report for server tests:

npx nyc report --reporter=html

Lint files:

npm run lint
npm run lint:fix

Test TypeScript declaration file for style and correctness:

npm run lint:dts

Migration

v4.0.0

htmlparser2 has been upgraded to v9.

v3.0.0

domhandler has been upgraded to v5 so some parser options like normalizeWhitespace have been removed.

Release

Release and publish are automated by Release Please.

Special Thanks

License

MIT

License

NimmiW/html-dom-parser

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