Output CSV in Express

app.js

/**
 * Module dependencies.
 */

var express = require('express')
  , app = module.exports = express.createServer();

// Configuration

app.use(app.router);
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));

// Routes

app.get('/', function(req, res) {
  var data = [
      ['ID', 'Name', 'Age', 'Gender']
    , [1, 'Taro Yamada', 25, 'Male']
    , [2, 'Hanako Yamada', 24, 'Female']
    , [3, 'John Doe', 30, 'Male']
    , [4, 'Jane Doe', 30, 'Female']
  ];

  // CSV Specification
  // http://www.ietf.org/rfc/rfc4180.txt

  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/csv');

  data.forEach(function(item) {
    res.write(item.map(function(field) {
      return '"' + field.toString().replace(/\"/g, '""') + '"';
    }).toString() + '\r\n');
  });
  
  res.end();
});

// Listen

app.listen(3000);

app2.js

/**
 * Module dependencies.
 */

var express = require('express')
  , Iconv = require('iconv').Iconv
  , sjis = new Iconv('UTF-8', 'Shift_JIS')
  , app = module.exports = express.createServer();

// Configuration

app.use(app.router);
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));

// Routes

app.get('/', function(req, res) {
  var csv = ''
    , data = [
      ['ID', 'お名前', '年齢', '性別']
    , [1, '山田　太郎', 25, '男性']
    , [2, '山田　花子', 24, '女性']
    ];

  // CSV Specification
  // http://www.ietf.org/rfc/rfc4180.txt

  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/csv; charset=Shift_JIS');

  data.forEach(function(item) {
    csv += item.map(function(field) {
      return '"="' + field.toString().replace(/\"/g, '""') + '""';
    }).toString() + '\r\n';
  });
  
  res.write(sjis.convert(csv));
  res.end();
});

// Listen

app.listen(3000);

node-iconv-usage.js

/**
 * Module dependencies.
 */

var Iconv = require('iconv').Iconv
  , sjis = new Iconv('UTF-8', 'Shift_JIS');

console.log(sjis.convert('世界の皆さん、こんにちは。'));