Fast HTML Parser is a very fast HTML parser. Which will generate a simplified DOM tree, with element query support.
Per the design, it intends to parse massive HTML files in lowest price, thus the
performance is the top priority. For this reason, some malformatted HTML may not
be able to parse correctly, but most usual errors are covered (eg. HTML4 style
no closing <li>, <td> etc).
npm install --save node-html-parserNote: when using Fast HTML Parser in a Typescript project the minimum Typescript version supported is
^4.1.2.
-- 2022-08-10
html-parser :24.1595 ms/file ± 18.7667
htmljs-parser :4.72064 ms/file ± 5.67689
html-dom-parser :2.18055 ms/file ± 2.96136
html5parser :1.69639 ms/file ± 2.17111
cheerio :12.2122 ms/file ± 8.10916
parse5 :6.50626 ms/file ± 4.02352
htmlparser2 :2.38179 ms/file ± 3.42389
htmlparser :17.4820 ms/file ± 128.041
high5 :3.95188 ms/file ± 2.52313
node-html-parser:2.04288 ms/file ± 1.25203
node-html-parser (last release):2.00527 ms/file ± 1.21317Tested with htmlparser-benchmark.
import { parse } from 'node-html-parser';
const root = parse('<ul id="list"><li>Hello World</li></ul>');
console.log(root.firstChild.structure);
// ul#list
// li
// #text
console.log(root.querySelector('#list'));
// { tagName: 'ul',
// rawAttrs: 'id="list"',
// childNodes:
// [ { tagName: 'li',
// rawAttrs: '',
// childNodes: [Object],
// classNames: [] } ],
// id: 'list',
// classNames: [] }
console.log(root.toString());
// <ul id="list"><li>Hello World</li></ul>
root.set_content('<li>Hello World</li>');
root.toString(); // <li>Hello World</li>var HTMLParser = require('node-html-parser');
var root = HTMLParser.parse('<ul id="list"><li>Hello World</li></ul>');Parse the data provided, and return the root of the generated DOM.
-
data, data to parse
-
options, parse options
{ lowerCaseTagName: false, // convert tag name to lower case (hurts performance heavily) comment: false, // retrieve comments (hurts performance slightly) fixNestedATags: false, // fix invalid nested <a> HTML tags parseNoneClosedTags: false, // close none closed HTML tags instead of removing them voidTag: { tags: ['area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source', 'track', 'wbr'], // optional and case insensitive, default value is ['area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source', 'track', 'wbr'] closingSlash: true // optional, default false. void tag serialisation, add a final slash <br/> }, blockTextElements: { script: true, // keep text content when parsing noscript: true, // keep text content when parsing style: true, // keep text content when parsing pre: true // keep text content when parsing } }
Parse the data provided, return true if the given data is valid, and return false if not.
classDiagram
direction TB
class HTMLElement{
this trimRight()
this removeWhitespace()
Node[] querySelectorAll(string selector)
Node querySelector(string selector)
HTMLElement[] getElementsByTagName(string tagName)
Node closest(string selector)
Node appendChild(Node node)
this insertAdjacentHTML('beforebegin' | 'afterbegin' | 'beforeend' | 'afterend' where, string html)
this setAttribute(string key, string value)
this setAttributes(Record string, string attrs)
this removeAttribute(string key)
string getAttribute(string key)
this exchangeChild(Node oldNode, Node newNode)
this removeChild(Node node)
string toString()
this set_content(string content)
this set_content(Node content)
this set_content(Node[] content)
this remove()
this replaceWith((string | Node)[] ...nodes)
ClassList classList
HTMLElement clone()
HTMLElement getElementById(string id)
string text
string rawText
string tagName
string structuredText
string structure
Node firstChild
Node lastChild
Node nextSibling
HTMLElement nextElementSibling
Node previousSibling
HTMLElement previousElementSibling
string innerHTML
string outerHTML
string textContent
Record<string, string> attributes
[number, number] range
}
class Node{
<<abstract>>
string toString()
Node clone()
this remove()
number nodeType
string innerText
string textContent
}
class ClassList{
add(string c)
replace(string c1, string c2)
remove(string c)
toggle(string c)
boolean contains(string c)
number length
string[] value
string toString()
}
class CommentNode{
CommentNode clone()
string toString()
}
class TextNode{
TextNode clone()
string toString()
string rawText
string trimmedRawText
string trimmedText
string text
boolean isWhitespace
}
Node --|> HTMLElement
Node --|> CommentNode
Node --|> TextNode
Node ..> ClassList
Trim element from right (in block) after seeing pattern in a TextNode.
Remove whitespaces in this sub tree.
Query CSS selector to find matching nodes.
Note: Full range of CSS3 selectors supported since v3.0.0.
Query CSS Selector to find matching node. null if not found.
Get all elements with the specified tagName.
Note: Use * for all elements.
Query closest element by css selector. null if not found.
Insert one or multiple nodes or text before the current element. Does not work on root.
Insert one or multiple nodes or text after the current element. Does not work on root.
Insert one or multiple nodes or text to the first position of an element's child nodes.
Insert one or multiple nodes or text to the last position of an element's child nodes. This is similar to appendChild, but accepts arbitrarily many nodes and converts strings to text nodes.
Append a node to an element's child nodes.
Parses the specified text as HTML and inserts the resulting nodes into the DOM tree at a specified position.
Set value to key attribute.
Set attributes of the element.
Remove key attribute.
Get key attribute. undefined if not set.
Exchanges given child with new child.
Remove child node.
Same as outerHTML
Set content. Notice: Do not set content of the root node.
Remove current element.
Replace current element with other node(s).
Add class name.
Replace class name with another one.
Remove class name.
Toggle class. Remove it if it is already included, otherwise add.
Returns true if the classname is already in the classList.
Get class names.
Clone a node.
Get element by it's ID.
Get unescaped text value of current node and its children. Like innerText.
(slow for the first time)
Get escaped (as-is) text value of current node and its children. May have
& in it. (fast)
Get or Set tag name of HTMLElement. Note that the returned value is an uppercase string.
Get structured Text.
Get DOM structure.
Get all child nodes. A child node can be a TextNode, a CommentNode and a HTMLElement.
Get all child elements, so all child nodes of type HTMLELement.
Get first child node. undefined if the node has no children.
Get last child node. undefined if the node has no children.
Get the first child of type HTMLElement. undefined if none exists.
Get the first child of type HTMLElement. undefined if none exists.
Get the number of children that are of type HTMLElement.
Set or Get innerHTML.
Get outerHTML.
Returns a reference to the next child node of the current element's parent. null if not found.
Returns a reference to the next child element of the current element's parent. null if not found.
Returns a reference to the previous child node of the current element's parent. null if not found.
Returns a reference to the previous child element of the current element's parent. null if not found.
Get or Set textContent of current element, more efficient than set_content.
Get all attributes of current element. Notice: do not try to change the returned value.
Corresponding source code start and end indexes (ie [ 0, 40 ])