express load a page

const express = require('express');
const app = express();
const path = require('path');
const router = express.Router();

router.get('/',function(req,res){
  res.sendFile(path.join(__dirname, '/index.html'));
  //__dirname : It will resolve to your project folder.
});

// To go back a folder from __dirname
router.get('/about',function(req,res){
  res.sendFile(path.join(__dirname, '../somefolder/about.html'));
});