How to serve an angular2 app in a node.js server

1. Use ng build to build your app into build directory.
2. Create nodejs app to server the build directory as static content, then create route for api.

Following is an example of nodejs app using express that will serve the Angular2 app:

/*
Put content of angular2 build into 'public' folder.
*/
const html = __dirname + '/public';

const port = 4000;
const apiUrl = '/api';

// Express
const bodyParser = require('body-parser');
const compression = require('compression');
const express = require('express');
var app = express();

app
    .use(compression())
    .use(bodyParser.json())
    // Static content
    .use(express.static(html))
    // Default route
    .use(function(req, res) {
      res.sendFile(html + 'index.html');
    })
    // Start server
    .listen(port, function () {
        console.log('Port: ' + port);
        console.log('Html: ' + html);
    });

// continue with api code below ...

None of the answers worked properly for me. And if it worked, the Angular routing did not work on reload.
So this is how I solved it. Angular routing works even on full page reload.

function getRoot(request, response) {
   response.sendFile(path.resolve('./public/angular/index.html'));
}

function getUndefined(request, response) {
   response.sendFile(path.resolve('./public/angular/index.html'));
}

// Note the dot at the beginning of the path
app.use(express.static('./public/angular'));

app.get('/', getRoot);
app.get('/*', getUndefined);

NO angular base-href rewrite is required! Just use ng build or ng build --prod.

Here is full back end code which is working

const express = require('express');
var app = express();
var port = 9999;

function getRoot(request, response) {
    response.sendFile(path.resolve('./public/angular/index.html'));
 }

 function getUndefined(request, response) {
     response.sendFile(path.resolve('./public/angular/index.html'));
 }


 app.use(express.static('./public/angular'));

 app.get('/', getRoot);
 app.get('/*', getUndefined);

 // Start server
 app.listen(port, function () {
    console.log('server running at port: ' + port);
}); 

Based on @NTN-JAVA answer, here's a solution to serve an Angular app from NodeJS server.

Here's the summary from beginning:

1. npm install -g @angular/cli

2. ng new PROJECT_NAME

3. cd PROJECT_NAME

4. npm install nodemon express cookie-parser body-parser morgan method-override --save

5.Create app.js:

var express = require('express');
var app = express();
var morgan = require('morgan');
var bodyParser = require('body-parser');
var port = process.env.PORT || 3000;
var methodOverride = require('method-override'); // simulate DELETE and PUT (express4)
var router = express.Router();

console.log('——————————- Run on port '+ port);

/****************************** Router ***************************/
router.get('*', function(req, res){
    res.sendFile('index.html', { root: __dirname + '/' });
});

/****************************** /Router ***************************/

//app.use(morgan('dev')); // log every request to the console
app.use(express.static(__dirname + '/')); // Static (public) folder

app.use(bodyParser.urlencoded({extended:true}));// get information from html forms
app.use(bodyParser.json());
app.use(bodyParser.json({ type: 'application/vnd.api+json' }));
app.use(methodOverride());
app.use('/', router); // app.use('/parent', router); call all from localhost:port/parent/*

app.listen(port);

6. Edit package.json file:

{
   ...
    "scripts": {
        "start": "ng build; cp app.js dist/app.js; node dist/app.js",
    }
   ...
}

7. Run npm start

This answer also offers a solution for calling direct URLs from browser and resolving them correctly in your app.

Follow the Express node server with Angular 2 CLI document to serve your application through Node.js server. The application is being served Through Node.js and a REST full API. You can design this REST as your requirements.

E.g.

Serve application with http://localhost:5000/app

app.get('/app/*', function(req, res) {
    res.sendFile(path.join(__dirname, 'index.html'))
});

or

Serve data from REST calls with http://localhost:5000/rest/contacts

app.get('/rest/user', function(req, res) {
    res.send({
        "id": 2,
        "name": "Jhon",
    })
});

Step 1: In order to get static content, run this command in your angular app directory -

ng build --prod

Step 2: The first step will create a dist folder in your current directory, move all files in the dist folder to public folder of your node app -

Step 3: Create a node server. App.js -

var path = require('path');
var express = require('express');
var cookieParser = require('cookie-parser');
var cookieParser = require('cookie-parser');

const allowedExt = [
    '.js',
    '.ico',
    '.css',
    '.png',
    '.jpg',
    '.woff2',
    '.woff',
    '.ttf',
    '.svg',
];

var app = express();
app.use(cookieParser());

function getAngularApp(request, response) {
  response.sendFile(path.resolve('./public/index.html'));
}

function defaultHandler(request, response) {
  if (allowedExt.filter(ext => req.url.indexOf(ext) > 0).length > 0) {
    response.sendFile(path.resolve(`public/${req.url}`));
  } else {
    response.sendFile(path.resolve('./public/index.html'));
  }
}

app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.get('/', getAngularApp);
app.get('/*', defaultHandler);

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};
  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;