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

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.com: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.com:10255/?ssl=true';
    
  3. Open your favorite terminal, run npm install mongodb --save, then run your app with node app.js

Next steps