express.md

   1 ---
   2 title: Express.js
   3 category: JavaScript libraries
   4 ---
   5
   6 ### Settings
   7
   8 ```js
   9 app.set('x', 'yyy')
  10 app.get('x') //=> 'yyy'
  11
  12 app.enable('trust proxy')
  13 app.disable('trust proxy')
  14
  15 app.enabled('trust proxy') //=> true
  16 ```
  17
  18 ### Env
  19
  20 ```js
  21 app.get('env')
  22 ```
  23
  24 ### Config
  25
  26 ```js
  27 app.configure('production', function() {
  28   app.set...
  29 })
  30 ```
  31
  32 ### Wares
  33
  34 ```js
  35 app.use(express.static(__dirname + '/public'))
  36 app.use(express.logger())
  37 ```
  38
  39 ### Helpers
  40
  41 ```js
  42 app.locals({
  43   title: "MyApp",
  44 })
  45 ```
  46
  47 ## Request & response
  48
  49 ### Request
  50
  51 ```js
  52 // GET  /user/tj
  53 req.path         //=> "/user/tj"
  54 req.url          //=> "/user/tj"
  55 req.xhr          //=> true|false
  56 req.method       //=> "GET"
  57 req.params
  58 req.params.name  //=> "tj"
  59 req.params[0]
  60 ```
  61
  62 ```js
  63 // GET /search?q=tobi+ferret
  64 req.query.q // => "tobi ferret"
  65 ```
  66
  67 ```js
  68 req.cookies
  69 ```
  70
  71 ```js
  72 req.accepted
  73 // [ { value: 'application/json', quality: 1, type: 'application', subtype: 'json' },
  74 //   { value: 'text/html', quality: 0.5, type: 'text',subtype: 'html' } ]
  75 ```
  76
  77 ```js
  78 req.is('html')
  79 req.is('text/html')
  80 ```
  81
  82 ```js
  83 req.headers
  84 req.headers['host']
  85 req.headers['user-agent']
  86 req.headers['accept-encoding']
  87 req.headers['accept-language']
  88 ```
  89
  90 ### Response
  91
  92 ```js
  93 res.redirect('/')
  94 res.redirect(301, '/')
  95 ```
  96
  97 ```js
  98 res.set('Content-Type', 'text/html')
  99 ```
 100
 101 ```js
 102 res.send('hi')
 103 res.send(200, 'hi')
 104 ```
 105
 106 ```js
 107 res.json({ a: 2 })
 108 ```