# 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/node_modules/express/
History.md LICENSE Readme.md index.js lib node_modules package.json
* install express-generator
>$ sudo npm install -g express-generator
$ ls /usr/local/lib/node_modules/express-generator/
LICENSE README.md bin node_modules 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
[email protected] node_modules/serve-favicon
├── [email protected]
├── [email protected]
├── [email protected]
└── [email protected]
[email protected] node_modules/cookie-parser
├── [email protected]
└── [email protected]
... ...
$ 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
> [email protected] 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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