#1.3 Node.js Basics - using npm and angular cli

Prerequisites: node.js, npm

1. Create a directory for the project e.g.:
$ mkdir /Projects/meanapp
$ cd  /Projects/meanapp



2. Start generating the package.json using app.js as entry point:
$ npm init
This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See `npm help json` for definitive documentation on these fields
and exactly what they do.

Use `npm install <pkg> --save` afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.
name: (meanapp) 
version: (1.0.0) 
description: MEAN app
entry point: (index.js) app.js
test command: 
git repository: 
keywords: 
author: Author
license: (ISC) 
About to write to /home/admin/Projects/meanapp/package.json:

{
  "name": "meanapp",
  "version": "1.0.0",
  "description": "MEAN app",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Author",
  "license": "ISC"
}


Is this ok? (yes)

3. Below is the package.json generated in the previous step; below in bold is the line added manually in order to allow using the npm start command:

{
  "name": "meanapp",
  "version": "1.0.0",
  "description": "MEAN app",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node app"
  },
  "author": "Author",
  "license": "ISC"
}

4. Install the necessary node modules; using --save the package.json is automatically updated
$ npm install --save express mongoose bcryptjs cors jsonwebtoken body-parser passport passport-jwt
meanapp@1.0.0 /home/admin/Projects/meanapp
├── bcryptjs@2.4.3 
├─┬ body-parser@1.16.1 
│ ├── bytes@2.4.0 
│ ├── content-type@1.0.2 
│ ├── debug@2.6.1 
│ ├── depd@1.1.0 
│ ├─┬ http-errors@1.5.1 
│ │ ├── inherits@2.0.3 
│ │ ├── setprototypeof@1.0.2 
│ │ └── statuses@1.3.1 
│ ├── iconv-lite@0.4.15 
│ ├─┬ on-finished@2.3.0 
│ │ └── ee-first@1.1.1 
│ ├── qs@6.2.1 
│ ├─┬ raw-body@2.2.0 
│ │ └── unpipe@1.0.0 
│ └─┬ type-is@1.6.14 
│   ├── media-typer@0.3.0 
│   └─┬ mime-types@2.1.14 
│     └── mime-db@1.26.0 
├─┬ cors@2.8.1 
│ └── vary@1.1.0 
├─┬ express@4.14.1 
│ ├─┬ accepts@1.3.3 
│ │ └── negotiator@0.6.1 
│ ├── array-flatten@1.1.1 
│ ├── content-disposition@0.5.2 
│ ├── cookie@0.3.1 
│ ├── cookie-signature@1.0.6 
│ ├─┬ debug@2.2.0 
│ │ └── ms@0.7.1 
│ ├── encodeurl@1.0.1 
│ ├── escape-html@1.0.3 
│ ├── etag@1.7.0 
│ ├─┬ finalhandler@0.5.1 
│ │ └─┬ debug@2.2.0 
│ │   └── ms@0.7.1 
│ ├── fresh@0.3.0 
│ ├── merge-descriptors@1.0.1 
│ ├── methods@1.1.2 
│ ├── parseurl@1.3.1 
│ ├── path-to-regexp@0.1.7 
│ ├─┬ proxy-addr@1.1.3 
│ │ ├── forwarded@0.1.0 
│ │ └── ipaddr.js@1.2.0 
│ ├── qs@6.2.0 
│ ├── range-parser@1.2.0 
│ ├─┬ send@0.14.2 
│ │ ├─┬ debug@2.2.0 
│ │ │ └── ms@0.7.1 
│ │ ├── destroy@1.0.4 
│ │ └── mime@1.3.4 
│ ├── serve-static@1.11.2 
│ └── utils-merge@1.0.0 
├─┬ jsonwebtoken@7.3.0 
│ ├─┬ joi@6.10.1 
│ │ ├── hoek@2.16.3 
│ │ ├── isemail@1.2.0 
│ │ ├── moment@2.17.1 
│ │ └── topo@1.1.0 
│ ├─┬ jws@3.1.4 
│ │ ├── base64url@2.0.0 
│ │ ├─┬ jwa@1.1.5 
│ │ │ ├── buffer-equal-constant-time@1.0.1 
│ │ │ └── ecdsa-sig-formatter@1.0.9 
│ │ └── safe-buffer@5.0.1 
│ ├── lodash.once@4.1.1 
│ ├── ms@0.7.2 
│ └── xtend@4.0.1 
├─┬ mongoose@4.8.5 
│ ├─┬ async@2.1.4 
│ │ └── lodash@4.17.4 
│ ├── bson@1.0.4 
│ ├── hooks-fixed@1.2.0 
│ ├── kareem@1.2.1 
│ ├─┬ mongodb@2.2.24 
│ │ ├── es6-promise@3.2.1 
│ │ ├─┬ mongodb-core@2.1.8 
│ │ │ └─┬ require_optional@1.0.0 
│ │ │   ├── resolve-from@2.0.0 
│ │ │   └── semver@5.3.0 
│ │ └─┬ readable-stream@2.1.5 
│ │   ├── buffer-shims@1.0.0 
│ │   ├── core-util-is@1.0.2 
│ │   ├── isarray@1.0.0 
│ │   ├── process-nextick-args@1.0.7 
│ │   ├── string_decoder@0.10.31 
│ │   └── util-deprecate@1.0.2 
│ ├── mpath@0.2.1 
│ ├── mpromise@0.5.5 
│ ├─┬ mquery@2.2.3 
│ │ ├── bluebird@2.10.2 
│ │ ├─┬ debug@2.2.0 
│ │ │ └── ms@0.7.1 
│ │ └── sliced@0.0.5 
│ ├── muri@1.2.1 
│ ├── regexp-clone@0.0.1 
│ └── sliced@1.0.1 
├─┬ passport@0.3.2 
│ ├── passport-strategy@1.0.0 
│ └── pause@0.0.1 
└── passport-jwt@2.2.1 

npm WARN meanapp@1.0.0 No repository field.

5. Install nodemon, an excellent development tool that monitor for any changes in node.js application and automatically restart the server. Use -g to install globally:
$ sudo npm install -g nodemon
/usr/bin/nodemon -> /usr/lib/node_modules/nodemon/bin/nodemon.js
/usr/lib
└─┬ nodemon@1.11.0 
  ├─┬ chokidar@1.6.1
  │ ├─┬ anymatch@1.3.0
  │ │ └─┬ micromatch@2.3.11
  │ │   └─┬ object.omit@2.0.1
  │ │     └─┬ for-own@0.1.5 
  │ │       └── for-in@1.0.1 
  │ └─┬ readdirp@2.1.0
  │   └── readable-stream@2.2.3 
  └─┬ update-notifier@0.5.0
    └─┬ latest-version@1.0.1
      └─┬ package-json@1.2.0
        └─┬ registry-url@3.1.0
          └─┬ rc@1.1.7 
            └── strip-json-comments@2.0.1 

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules/nodemon/node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.1: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

6. Create app.js file in the project root directory:
const express    = require('express');
const path       = require('path');
const bodyParser = require('body-parser');
const cors       = require('cors');
const passport   = require('passport');
const mongoose   = require('mongoose');

const users      = require('./routes/users');
const dbconfig   = require('./config/database');

/* Connect to database */
mongoose.connect(dbconfig.database, (err) => {
    if(err){
        console.log('Database connection error: ', err); 
    }
});
mongoose.connection.on('connected', () => {
    console.log('Connected to database ' + dbconfig.database);
});

/* Express initialization */
const app = express();

/* Server port number */
const port = 3000;

/* Middleware - CORS */
app.use(cors());

/* Set static folder */
app.use(express.static(path.join(__dirname, 'public')));

/* Middleware - Body parser */
app.use(bodyParser.json());

/* Middleware - Routes */
app.use('/users', users);

/* Root */
app.get('/', (req, res) => {
    res.send('Invalid endpoint');
})

/* Start server */
app.listen(port, () => {
    console.log('Server started on port '+port);
})

7. The file ./routes/users refers to routes:
const express = require('express');
const router  = express.Router();

router.post('/register', (req, res) => {
    res.send('REGISTER');
})

router.post('/authenticate', (req, res) => {
    res.send('AUTHENTICATE');
})

router.get('/profile', (req, res) => {
    res.send('PROFILE');
})

module.exports = router;

8. The file ./config/database refers to the database connection parameters:
module.exports = {
    database: 'mongodb://localhost:27017/meanapp',
    secret: 'mysecret'
}


References:
- https://youtu.be/DQ9pZ2NKXRo?list=PLillGF-RfqbZMNtaOXJQiDebNXjVapWPZ
- https://github.com/remy/nodemon
- https://www.npmjs.com/package/cors
- https://www.npmjs.com/package/body-parser