Node.js with Express
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Express: web application framework for node Includes: getting started (install), configuration, middlewares, session management, routing and rendering
![What is Express?
get '/' do
redirect to('/hello/World' )
end
get '/hello/:name' do
"Hello #{params[:name]}!"
end
Gergely Nemeth
● Node.js web framework
● Sinatra-inspired](https://image.slidesharecdn.com/node-130807014614-phpapp02/85/Node-js-with-Express-2-320.jpg)
![Routing
Gergely Nemeth
app.VERB(path, [callback...], callback)
● GET, POST, PUT, DELETE, PATCH
● [callback...] are middlewares
app.get(/^/commits/(w+)(?:..(w+))?$/, function(req, res){
var from = req.params[0];
var to = req.params[1] || 'HEAD';
res.send('commit range ' + from + '..' + to);
});](https://image.slidesharecdn.com/node-130807014614-phpapp02/85/Node-js-with-Express-7-320.jpg)
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Node.js with Express
- 1. Node.js with Express web application framework for node Gergely Nemeth
- 2. What is Express? get '/' do redirect to('/hello/World' ) end get '/hello/:name' do "Hello #{params[:name]}!" end Gergely Nemeth ● Node.js web framework ● Sinatra-inspired
- 3. Getting started Gergely Nemeth ● npm install express var express = require('express'); var app = express(); app.get('/hello', function(req, res){ res.send('Hello World'); }); app.listen(3000); console.log('Listening on port 3000');
- 4. Getting started #2 Gergely Nemeth ● npm install -g express ● express --sessions --css stylus --ejs 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.styl create : myapp/routes create : myapp/routes/index.js create : myapp/views create : myapp/views/index.ejs
- 5. Configuration Gergely Nemeth Used to separate production/development/etc... configurations (based on NODE_ENV) // all environments app.configure(function(){ app.set('title', 'Rescue'); }) // development only app.configure('development', function(){ app.set('mongoUrl', 'localhost/dev'); }) // production only app.configure('production', function(){ app.set('mongoUrl', 'n.n.n.n/prod'); })
- 6. Middlewares Gergely Nemeth ● logging, auth, gzip, csrf protection, session management, etc... ● called sequentially, next() callback can trigger the next middleware //built-in middlewares app.use(express.logger()); app.use(express.compress()); app.use(express.methodOverride()); app.use(express.bodyParser()); //custom error handling app.use(function onError(err, req, res, next) { //do something with the error next(err); });
- 7. Routing Gergely Nemeth app.VERB(path, [callback...], callback) ● GET, POST, PUT, DELETE, PATCH ● [callback...] are middlewares app.get(/^/commits/(w+)(?:..(w+))?$/, function(req, res){ var from = req.params[0]; var to = req.params[1] || 'HEAD'; res.send('commit range ' + from + '..' + to); });
- 8. Sessions Gergely Nemeth ● With middlewares app.use(express.cookieParser()); app. use(express.cookieParser('some secret')); ● For authentication use: ○ Passportjs ○ Everyauth
- 9. Rendering Gergely Nemeth ● With template engines: Mustache(hogan), Jade, EJS... ● Layout, views, partials ● Variables are passed to the render engine app.get('/', function(req, res) { res.locals = { title: 'Title', }; return res.render( 'index', { partials: { part: 'part', } } ); });
- 10. Rendering #2 Gergely Nemeth ● part.html <h1>{{ title }}</h1> ● index.html {{> part}} Hello world!