server.js

var express = require('express');
var fs      = require('fs');
var app     = express();

app.get('/page', function (req, res) {
    res.setHeader('content-type', 'text/html');
    res.send(fs.readFileSync('./index.html'));
});

app.get('/', function (req, res) {
    res.setHeader('content-type', 'application/json');
    res.send(fs.readFileSync('./user.json'));
});

app.listen(3000, function () {
    console.log('open http://localhost:3000/page');
});