how to use node in html code example

Example 1: node.js html

const express = require('express');
const app = new express();

app.get('/', function(request, response){
    response.sendFile('absolutePathToYour/htmlPage.html');
});

Example 2: node using html

var http = require('http'),
    fs = require('fs');


fs.readFile('./index.html', function (err, html) {
    if (err) {
        throw err; 
    }       
    http.createServer(function(request, response) {  
        response.writeHeader(200, {"Content-Type": "text/html"});  
        response.write(html);  
        response.end();  
    }).listen(8000);
});