---
title: express入門
tags: []
categories: ["Programming", "JavaScript", "Node.js", "express"]
date: 2013-04-07T12:19:33Z
updated: 2012-04-07T12:19:33Z
---

express3.1.1で入門

### インストール

    $ npm install -g express
    $ npm link express

 でローカルディレクトリにリンクを張れる。

    $ ll node_modules
    total 8
    lrwxr-xr-x  1 maki  staff    45B  4  7 21:35 express -> /usr/local/share/npm/lib/node_modules/express

### Hello Word

#### hello.js

    var express = require('express')
    var app = express();
    app.get('/', function(request, response) {
        response.send('Hello World!');
    });
    app.listen(8080);

実行

    $ node hello.js

### expressコマンドでアプリケーション雛形作成

    $ express test
    
       create : test
       create : test/package.json
       create : test/app.js
       create : test/public
       create : test/public/javascripts
       create : test/public/images
       create : test/public/stylesheets
       create : test/public/stylesheets/style.css
       create : test/routes
       create : test/routes/index.js
       create : test/routes/user.js
       create : test/views
       create : test/views/layout.jade
       create : test/views/index.jade
    
       install dependencies:
         $ cd test && npm install
    
       run the app:
         $ node app

表示されているとおり、

    $ cd test
    $ npm install
    $ node app

で3000番ポートでHTTPサーバーが立ち上がる

### JSONをさばく

    var express = require('express')
      , http = require('http')
      , path = require('path');
    
    var app = express();
    app.set('port', process.env.PORT || 3000);
    app.use(express.favicon());
    app.use(express.logger('dev'));
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.use(express.static(path.join(__dirname, 'public')));
    
    // development only                                                                                                                             
    if ('development' == app.get('env')) {
      app.use(express.errorHandler());
    }
    
    app.post('/status', function (req, res) {
        var text = req.body.text || 'OK';
        res.send({text: text});
    });
    
    http.createServer(app).listen(app.get('port'), function(){
        console.log('Express server listening on port ' + app.get('port'));
    });


curlでたたく

    $ curl -X POST -H 'Content-Type: application/json' -d '{"text":"Hello"}' -v http://localhost:3000/status
    * About to connect() to localhost port 3000 (#0)
    *   Trying ::1...
    * Connection refused
    *   Trying 127.0.0.1...
    * connected
    * Connected to localhost (127.0.0.1) port 3000 (#0)
    > POST /status HTTP/1.1
    > User-Agent: curl/7.24.0 (x86_64-apple-darwin12.0) libcurl/7.24.0 OpenSSL/0.9.8r zlib/1.2.5
    > Host: localhost:3000
    > Accept: */*
    > Content-Type: application/json
    > Content-Length: 16
    > 
    * upload completely sent off: 16 out of 16 bytes
    < HTTP/1.1 200 OK
    < X-Powered-By: Express
    < Content-Type: application/json
    < Content-Length: 16
    < Date: Tue, 09 Apr 2013 02:48:23 GMT
    < Connection: keep-alive
    < 
    * Connection #0 to host localhost left intact
    {"text":"Hello"}* Closing connection #0