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joplin notion extension/Web Development/nodejs/HTML parser.md

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+HTML parser 
+
+- jsdom
+  It's an npm library that can take html as input and let you do things like document.querySelector on it inside of NodeJS without running a sandboxed browser instance
+- node-html-parser : like jsdom
+  https://www.npmjs.com/package/node-html-parser
+  eg
+  ```js
+	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>
+	```