Himalaya

Parse HTML into JSON

Usage

Node

npm install himalaya

import fs from 'fs'
import { parse } from 'himalaya'
const html = fs.readFileSync('/webpage.html', { encoding: 'utf8' })
const json = parse(html)
console.log('👉', json)

Browser

Download himalaya.js and put it in a <script> tag. Himalaya will be accessible from window.himalaya.

const html = '<div>Hello world</div>'
const json = window.himalaya.parse(html)
console.log('👉', json)

Himalaya bundles well with Browersify and Webpack.

Example Input/Output

<div class="post post-featured">
  <p>Himalaya parsed me...</p>
  <!-- ...and I liked it. -->
</div>

;[
  {
    type: 'element',
    tagName: 'div',
    attributes: [
      {
        key: 'class',
        value: 'post post-featured',
      },
    ],
    children: [
      {
        type: 'element',
        tagName: 'p',
        attributes: [],
        children: [
          {
            type: 'text',
            content: 'Himalaya parsed me...',
          },
        ],
      },
      {
        type: 'comment',
        content: ' ...and I liked it. ',
      },
    ],
  },
]

Note: In this example, text nodes consisting of whitespace are not shown for readability.

Features

Synchronous

Himalaya transforms HTML into JSON, that's it. Himalaya is synchronous and does not require any complicated callbacks.

Handles Weirdness

Himalaya handles a lot of HTML's fringe cases, like:

Closes unclosed tags <p><b>...</p>
Ignores extra closing tags <span>...</b></span>
Properly handles void tags like <meta> and <img>
Properly handles self-closing tags like <input/>
Handles <!doctype> and <-- comments -->
Does not parse the contents of <script>, <style>, and HTML5 <template> tags

Preserves Whitespace

Himalaya does not cut corners and returns an accurate representation of the HTML supplied. To remove whitespace, post-process the JSON; check out an example script.

Line, column, and index positions

Himalaya can include the start and end positions of nodes in the parse output. To enable this, you can pass parse the parseDefaults extended with includePositions: true:

import { parse, parseDefaults } from 'himalaya'
parse('<img>', { ...parseDefaults, includePositions: true })
/* =>
[
  {
    "type": "element",
    "tagName": "img",
    "attributes": [],
    "children": [],
    "position": {
      "start": {
        "index": 0,
        "line": 0,
        "column": 0
      },
      "end": {
        "index": 5,
        "line": 0,
        "column": 5
      }
    }
  }
]
*/

Going back to HTML

Himalaya provides a stringify method. The following example parses the HTML to JSON then parses the JSON back into HTML.

import fs from 'fs'
import { parse, stringify } from 'himalaya'

const html = fs.readFileSync('/webpage.html', { encoding: 'utf8' })
const json = parse(html)
fs.writeFileSync('/webpage.html', stringify(json))

Why "Himalaya"?

First, my friends weren't helpful. Except Josh, Josh had my back.

While I was testing the parser, I threw a download of my Twitter homepage in and got a giant JSON blob out. My code editor Sublime Text has a mini-map and looking at it sideways the data looked like a never-ending mountain range. Also, "himalaya" has H, M, L in it.

andrejewski / himalaya

readme