expressで静的なJSONを返すだけのサーバを極力小さいコードで書いた感じ $ npm init $ npm install express --save-dev $ npm start

index.js

var express = require('express'),
    port    = 48172,
    ret     = { name:'hello', value:'world' };

express().get('/', function(req, res) {
    res.contentType('application/json').send(JSON.stringify(ret));
}).listen(port, function() {
    console.log("express server on localhost:%d", this.address().port);
});