Build an app using Node.js and Azure Cosmos DB's API for MongoDB

  • Article

APPLIES TO: MongoDB

This example shows you how to build a console app using Node.js and Azure Cosmos DB's API for MongoDB.

To use this example, you must:

  • Create an Azure Cosmos DB account configured to use Azure Cosmos DB's API for MongoDB.
  • Retrieve your connection string information.

Create the app

  1. Create a app.js file and copy & paste the code below.

    var MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
var ObjectId = require('mongodb').ObjectID;
var url = 'mongodb://<username>:<password>@<endpoint>.documents.azure.cn:10255/?ssl=true';

var insertDocument = function(db, callback) {
db.collection('families').insertOne( {
        "id": "AndersenFamily",
        "lastName": "Andersen",
        "parents": [
            { "firstName": "Thomas" },
            { "firstName": "Mary Kay" }
        ],
        "children": [
            { "firstName": "John", "gender": "male", "grade": 7 }
        ],
        "pets": [
            { "givenName": "Fluffy" }
        ],
        "address": { "country": "USA", "state": "WA", "city": "Seattle" }
    }, function(err, result) {
    assert.equal(err, null);
    console.log("Inserted a document into the families collection.");
    callback();
});
};

var findFamilies = function(db, callback) {
var cursor =db.collection('families').find( );
cursor.each(function(err, doc) {
    assert.equal(err, null);
    if (doc != null) {
        console.dir(doc);
    } else {
        callback();
    }
});
};

var updateFamilies = function(db, callback) {
db.collection('families').updateOne(
    { "lastName" : "Andersen" },
    {
        $set: { "pets": [
            { "givenName": "Fluffy" },
            { "givenName": "Rocky"}
        ] },
        $currentDate: { "lastModified": true }
    }, function(err, results) {
    console.log(results);
    callback();
});
};

var removeFamilies = function(db, callback) {
db.collection('families').deleteMany(
    { "lastName": "Andersen" },
    function(err, results) {
        console.log(results);
        callback();
    }
);
};

MongoClient.connect(url, function(err, client) {
assert.equal(null, err);
var db = client.db('familiesdb');
insertDocument(db, function() {
    findFamilies(db, function() {
    updateFamilies(db, function() {
        removeFamilies(db, function() {
            client.close();
        });
    });
    });
});
});

    Optional: If you are using the MongoDB Node.js 2.2 driver, please replace the following code snippet:

    Original:

    MongoClient.connect(url, function(err, client) {
assert.equal(null, err);
var db = client.db('familiesdb');
insertDocument(db, function() {
    findFamilies(db, function() {
    updateFamilies(db, function() {
        removeFamilies(db, function() {
            client.close();
        });
    });
    });
});
});

    Should be replaced with:

    MongoClient.connect(url, function(err, db) {
assert.equal(null, err);
insertDocument(db, function() {
    findFamilies(db, function() {
    updateFamilies(db, function() {
        removeFamilies(db, function() {
            db.close();
        });
    });
    });
});
});

  2. Modify the following variables in the app.js file per your account settings (Learn how to find your connection string):

    Important

    The MongoDB Node.js 3.0 driver requires encoding special characters in the Azure Cosmos DB password. Make sure to encode '=' characters as %3D

    Example: The password jm1HbNdLg5zxEuyD86ajvINRFrFCUX0bIWP15ATK3BvSv== encodes to jm1HbNdLg5zxEuyD86ajvINRFrFCUX0bIWP15ATK3BvSv%3D%3D

    The MongoDB Node.js 2.2 driver does not require encoding special characters in the Azure Cosmos DB password.

    var url = 'mongodb://<endpoint>:<password>@<endpoint>.documents.azure.cn:10255/?ssl=true';

  3. Open your favorite terminal, run npm install mongodb --save, then run your app with node app.js

Next steps