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Express Helloworld for Mac OS X

install node.js

• download node.js from https://nodejs.org/en/ current version is v4.1.1 (2015/10/05)

• install the package

  Node.js was installed at
  /usr/local/bin/node
  npm was installed at
  /usr/local/bin/npm
  Make sure that /usr/local/bin is in your $PATH.

• try node command

  $ node -v
  v4.1.1
  $ node -h
  Usage: node [options] [ -e script | script.js ] [arguments]
  node debug script.js [arguments]
  …

  $ npm -v
  2.14.4
  $ npm help
  …
  $ npm -l
  …

install express

• install express

  $ sudo npm install -g express
  $ ls /usr/local/lib/nodemodules/express/
  History.md LICENSE Readme.md index.js lib nodemodules package.json

• install express-generator

  $ sudo npm install -g express-generator
  $ ls /usr/local/lib/nodemodules/express-generator/
  LICENSE README.md bin nodemodules package.json templates

create express skeleton

• use express create skeleton source code

  $ mkdir helloworld
  $ cd helloworld/
  $ express myapp
  create : myapp
  create : myapp/package.json
  create : myapp/app.js
  create : myapp/public
  create : myapp/public/javascripts
  create : myapp/public/images
  create : myapp/public/stylesheets
  create : myapp/public/stylesheets/style.css
  create : myapp/routes
  create : myapp/routes/index.js
  create : myapp/routes/users.js
  create : myapp/views
  create : myapp/views/index.jade
  create : myapp/views/layout.jade
  create : myapp/views/error.jade
  create : myapp/bin
  create : myapp/bin/www
  install dependencies:
  $ cd myapp && npm install
  run the app:
  $ DEBUG=myapp:* npm start

• install require modules with package.json file under myapp $ cd myapp
  $ nmp install
  serve-favicon@2.3.0 nodemodules/serve-favicon
  ├── etag@1.7.0
  ├── fresh@0.3.0
  ├── ms@0.7.1
  └── parseurl@1.3.0
  cookie-parser@1.3.5 nodemodules/cookie-parser
  ├── cookie@0.1.3
  └── cookie-signature@1.0.6
  … …
  $ ls node_modules/
  body-parser cookie-parser debug express jade morgan serve-favicon

run express application

• run myapp express application, and access http://127.0.0.1:3000/

  $ DEBUG=myapp:* npm start
  myapp@0.0.0 start express/helloworld/myapp
  node ./bin/www
  myapp:server Listening on port 3000 +0ms

  GET / 200 502.117 ms - 170
  GET /stylesheets/style.css 200 4.042 ms - 111
  GET /favicon.ico 404 27.750 ms - 1335

• take a look at the index.js cgi source

  $ cat routes/index.js
  var express = require(‘express’);
  var router = express.Router();

  /* GET home page. */
  router.get(‘/’, function(req, res, next) {
  res.render(‘index’, { title: ‘Express’ });
  });

  module.exports = router;

• and the template of index (jade template engine)

  $ cat views/index.jade
  extends layout

  block content
  h1= title
  p Welcome to #{title}

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