server.js

var express = require("express");
var bodyParser = require("body-parser");
var mongoose = require("mongoose");

var config = require("./config");
var Item = require("./models/item");

var app = express();

app.use(bodyParser.json());
app.use(express.static("public"));

app.get("/items", function(req, res) {
  Item.find(function(err, items) {
    if (err) {
      return res.status(500).json({
        message: "Internal Server Error"
      });
    }

    res.json(items);
  });
});

app.post("/items", function(req, res) {
  Item.create({
    name: req.body.name
  }, function(err, item) {
    if (err) {
      return res.status(500).json({
        message: "Internal Server Error"
      });
    }

    res.status(201).json(item);
  });
});

app.put("/items/:id", function(req, res) {
  Item.findOneAndUpdate({id: req.params.id}, {name: req.body.name},
    function(err, item) {
      if (err) {
        return res.status(500).json({
          message: "Internal Server Error"
        });
      }

      res.status(200).json(item);
    }
  );
});

app.delete("/items/:id", function(req, res) {
  if (!req.body) {
    return res.status(400).json({
      message: "Invalid body"
    });
  }

  Item.findOneAndRemove({
      id: req.params.id
    }, function(err, item) {
      if (err) {
        return res.status(500).json({
          message: "Internal Server Error"
        });
      }

      res.status(200).json(item); //storage.items
    }
  );
});

app.use("*", function(req, res) {
  res.status(404).json({
    message: "Not Found"
  });
});

var runServer = function(callback) {
  mongoose.connect(config.DATABASE_URL, function(err) {
    if (err && callback) {
      return callback(err);
    }

    app.listen(config.PORT, function() {
      console.log("Listening on localhost:" + config.PORT);
      if (callback) {
        callback();
      }
    });
  });
};

// Make this file both an executable script and a module.
if (require.main === module) {
  runServer(function(err) {
    if (err) {
      console.error(err);
    }
  });
};

exports.app = app;
exports.runServer = runServer;