server.js

const path = require('path');
const express = require('express');
const webpack = require('webpack');
const config = require('./webpack.config.dev');

const app = express();
const compiler = webpack(config);

app.use(require('webpack-dev-middleware')(compiler, {
  noInfo: true,
  publicPath: config.output.publicPath
}));

app.use(require('webpack-hot-middleware')(compiler));

app.get('*', function(req, res, next) {
  const filename = path.join(compiler.outputPath, 'index.html');
  compiler.outputFileSystem.readFile(filename, function(err, result) {
    if (err) {
      return next(err);
    }
    res.set('content-type','text/html');
    res.send(result);
  });
});

app.listen(3000, 'localhost', function(err) {
  if(err) {
    return console.log(err);
  }

  console.log('Listening at http://localhost:3000');
});