1st

.gitignore

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+node_modules
+bower_components
+
+/.settings
+/.classpath
+/.project
+
+/.idea
+*.iml
+*.log

dao.js

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+'use strict';
+
+const mongodb = require('mongodb');
+const ObjectID = require('mongodb').ObjectID;
+const COLLECTION = 'test-collection';
+
+class Dao {
+
+    connect(url) {
+        return mongodb.MongoClient.connect(url)
+            .then(db => this.db = db);
+    }
+
+    findAll() {
+        return this.db.collection(COLLECTION).find().toArray();
+    }
+
+    close() {
+        if (this.db) {
+            this.db.close();
+        }
+    }
+}
+
+module.exports=Dao;

mongo.js

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+'use strict';
+
+const mongodb = require('mongodb');
+const ObjectID = mongodb.ObjectID;
+
+var url = 'mongodb://...';
+
+// insert({ key: 'value1' });
+// findAll().then(data => console.log(JSON.stringify(data)));
+
+function insert(data) {
+    mongodb.MongoClient.connect(url).then(db => {
+        var c = db.collection('test-collection');
+        c.insertOne(data).then(() => db.close());
+    });
+}
+
+function findAll() {
+    return mongodb.MongoClient.connect(url).then(db => {
+        var c = db.collection('test-collection');
+        return c.find().toArray().then(data => {
+            db.close();
+            return data;
+        });
+    });
+}

package.json

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+{
+  "name": "exback",
+  "version": "1.0.0",
+  "scripts": {
+    "start": "nodemon server.js"
+  },
+  "devDependencies": {
+    "body-parser": "^1.17.1",
+    "express": "^4.15.2",
+    "mongodb": "^2.2.25",
+    "nodemon": "^1.11.0"
+  }
+}

server.js

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+'use strict';
+
+const express = require('express');
+const app = express();
+
+app.get('/api/contacts', getContacts);
+app.get('/api/contacts/:id', getContact);
+
+app.listen(3000);
+
+function getContacts(request, response) {
+    response.set('Content-Type', 'application/json');
+    response.end(JSON.stringify([{ id: 1 }, { id: 2 }]));
+}
+
+function getContact(request, response) {
+    var id = request.params.id;
+    response.set('Content-Type', 'application/json');
+    response.end(JSON.stringify({ id: id }));
+}