The document provides a comprehensive guide on building a web application using MongoDB and Node.js, covering installation, setup, and key operations such as create, read, update, and delete (CRUD). It discusses event-driven architecture, connection management, and demonstrates various examples including data insertion, updates, and aggregations. It also addresses compatibility and highlights the flexible schema model of MongoDB.

2. MongoDB + Node.js
Building first app with MongoDB and Node.js

3. 3
Agenda
MongoDB + Node.js
Driver
ODM's
MEAN Stack
Meteor

4. 4
Ola, I'm Norberto!
Norberto Leite
Technical Evangelist
Madrid, Spain
@nleite
norberto@mongodb.com
http://www.mongodb.com/norberto

5. MongoDB Node.js

6. INFACT

7. MongoDB JavaScript

8. 8
Few reasons why
Flexible Agile
Web
Language

9. 9
MongoDB + Javascript
• MongoDB Shell
– JS interperter
• MongoDB MapReduce
– Runs on top of V8
– Map and Reduce functions are JS functions
• Native support for Node.js
– One of the most used Drivers out there!
– https://www.npmjs.com/package/mongodb

10. Node.js

11. 11
2 Foundations
Events Streams

12. 12
2 Foundations
• Events / Event Loop
– Single Thread Applications
– No threads
– Events Emitter
– Event Queue
– Known Events
• Streams
– Read, Write, Both
– Unix Pipes
– We use it extensively!

13. Install

14. npm package
$ npm install mongodb

15. Compatibility
http://docs.mongodb.org/ecosystem/drivers/node-js/#compatibility

16. 16
Compatibility w/ MongoDB

17. Initialize Project

18. package.json file
$ mkdir firstappnodejs
$ cd firstappnodejs
$ npm init

19. package.json file
$ mkdir firstappnodejs
$ cd firstappnodejs
$ npm init
...
{
"name": "firstappnodejs",
"version": "0.0.1",
"description": "Small demo webinar application",
"main": "index.js",
"scripts": {
"test": "workitout"
},
"repository": {
"type": "git",
"url": "git://github.com/nleite/firstappnodejs"
},
"dependencies": {
"mongodb": "~2.0"
},
"keywords": [http://docs.mongodb.org/ecosystem/drivers/node-js/#compatibility
"demo",
"nodejs",
"mongodb"
],
"author": "Norberto Leite",
"license": "Apache 2.0",
"bugs": {
"url": "https://github.com/nleite/firstappnodejs/issues"
},
"homepage": "https://github.com/nleite/firstappnodejs"

20. package.json file
$ mkdir firstappnodejs
$ cd firstappnodejs
$ npm init
...
{
"name": "firstappnodejs",
"version": "0.0.1",
"description": "Small demo webinar application",
"main": "index.js",
"scripts": {
"test": "workitout"
},
"repository": {
"type": "git",
"url": "git://github.com/nleite/firstappnodejs"
},
"dependencies": {
"mongodb": "~2.0"
},
"keywords": [
"demo",
"nodejs",
"mongodb"
],
"author": "Norberto Leite",
"license": "Apache 2.0",
"bugs": {
"url": "https://github.com/nleite/firstappnodejs/issues"
},
"homepage": "https://github.com/nleite/firstappnodejs"

21. Install our new firstappnodejs app!
$ npm install
> kerberos@0.0.10 install …
…
> bson@0.3.1 install
> mongodb@2.0.28 node_modules/mongodb
├── readable-stream@1.0.31 (isarray@0.0.1, inherits@2.0.1,
string_decoder@0.10.31, core-util-is@1.0.1)
└── mongodb-core@1.1.25 (kerberos@0.0.10, bson@0.3.1)
firstappnodejs/ $ ls
node_modules package.json

22. Connect

23. boot up MongoDB Server
$ mkdir ~/firstappdb
$ mongod --dbpath ~/firstappdb

24. boot up MongoDB Server
$ mkdir ~/firstappdb
$ mongod --dbpath ~/firstappdb --auth
--keyfile ~/n.pem
https://www.mongodb.com/products/mongodb-enterprise-advanced

25. boot up MongoDB Server
$ mkdir ~/firstappdb
$ mongod --dbpath ~/firstappdb --auth
--keyfile ~/n.pem
https://www.mongodb.com/products/mongodb-enterprise-advanced

26. var MongoClient = require('mongodb').MongoClient,
assert = require('assert');
Connect

27. var MongoClient = require('mongodb').MongoClient,
assert = require('assert');
//connection uri
var uri = "mongodb://localhost:27017/firstapp"
Connect

28. var MongoClient = require('mongodb').MongoClient,
assert = require('assert');
//connection uri
var uri = "mongodb://localhost:27017/firstapp"
//connect to MongoDB
MongoClient.connect(uri, function(err, db){
assert.equal(null, err);
console.log("Connected correctly to server");
db.close();
});
Connect

29. 29
Connection Pooling
• No traditional Pooling mechanism
– Single thread process
• Sockets to pipeline operations
• Failover
– Buffering up operations
– bufferMaxEntries
– numberOfRetries
– retryMiliSeconds
http://mongodb.github.io/node-mongodb-native/2.0/api/Db.html

30. CRUD

31. var insertDocuments = function(db, cb){
//we don't need to explicitly create a collection
var collection = db.collection('myCollection');
collection.insertMany([
{"mongodb": "is just awesome"},
{"nodejs": "so awesome"}
], function(err, result){
assert.equal(null, err);
//inserted 2 documents
assert.equal(2, result.insertedCount);
//invoke callback
cb(result);
});
}
Insert
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

32. var insertDocuments = function(db, cb){
//we don't need to explicitly create a collection
var collection = db.collection('myCollection');
collection.insertMany([
{"mongodb": "is just awesome"},
{"nodejs": "so awesome"}
], function(err, result){
assert.equal(null, err);
//inserted 2 documents
assert.equal(2, result.insertedCount);
//invoke callback
cb(result);
});
}
Insert
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

33. var insertDocuments = function(db, cb){
//we don't need to explicitly create a collection
var collection = db.collection('myCollection');
collection.insertMany([
{"mongodb": "is just awesome"},
{"nodejs": "so awesome"}
], function(err, result){
assert.equal(null, err);
//inserted 2 documents
assert.equal(2, result.insertedCount);
//invoke callback
cb(result);
});
}
Insert
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

34. var insertDocuments = function(db, cb){
//we don't need to explicitly create a collection
var collection = db.collection('myCollection');
collection.insertMany([
{"mongodb": "is just awesome"},
{"nodejs": "so awesome"}
], function(err, result){
assert.equal(null, err);
//inserted 2 documents
assert.equal(2, result.insertedCount);
//invoke callback
cb(result);
});
}
Insert
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

35. MongoClient.connect(uri, function(err, db) {
assert.equal(null, err);
console.log("Sweet! Talking to Server");
insertDocuments(db, function() {
db.close();
});
});
Insert
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

36. MongoClient.connect(uri, function(err, db) {
assert.equal(null, err);
console.log("Sweet! Talking to Server");
insertDocuments(db, function() {
db.close();
});
});
Insert
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

37. var updateDocument = function(db, cb){
var collection = db.collection("myCollection");
collection.updateOne( {"mongodb": "is just awesome"},
{$set: {"users": ["nleite"]}}, function( err, result){
assert.equal(null, err);
assert.equal(1, result.modifiedCount);
console.log("Cool, just updated");
cb(result);
});
}
Update
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#update

38. var updateDocument = function(db, cb){
var collection = db.collection("myCollection");
collection.updateOne( {"mongodb": "is just awesome"},
{$set: {"users": ["nleite"]}}, function( err, result){
assert.equal(null, err);
assert.equal(1, result.modifiedCount);
console.log("Cool, just updated");
cb(result);
});
}
Update
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#update

39. var updateDocument = function(db, cb){
var collection = db.collection("myCollection");
collection.updateOne( {"mongodb": "is just awesome"},
{$set: {"users": ["nleite"]}}, function( err, result){
assert.equal(null, err);
assert.equal(1, result.modifiedCount);
console.log("Cool, just updated");
cb(result);
});
}
Update
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#update

40. var updateDocument = function(db, cb){
var collection = db.collection("myCollection");
collection.updateOne( {"mongodb": "is just awesome"},
{$set: {"users": ["nleite"]}}, function( err, result){
assert.equal(null, err);
assert.equal(1, result.modifiedCount);
console.log("Cool, just updated");
cb(result);
});
}
Update
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#update

41. MongoClient.connect(uri, function(err, db) {
assert.equal(null, err);
console.log("Ok, I can now update!");
updateDocuments(db, function() {
db.close();
});
});
Update
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#update

42. Remove
var removeDocument = function(db, cb){
var collection = db.collection("myCollection");
collection.deleteOne( {"users": "nleite"},
function( err, result){
assert.equal(null, err);
assert.equal(1, result.deletedCount);
console.log("purged the @nleite contaminated
data!");
cb(result);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#remove

43. Remove
var removeDocument = function(db, cb){
var collection = db.collection("myCollection");
collection.deleteOne( {"users": "nleite"},
function( err, result){
assert.equal(null, err);
assert.equal(1, result.deletedCount);
console.log("purged the @nleite contaminated
data!");
cb(result);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#remove

44. Remove
var removeDocument = function(db, cb){
var collection = db.collection("myCollection");
collection.deleteOne( {"users": "nleite"},
function( err, result){
assert.equal(null, err);
assert.equal(1, result.deletedCount);
console.log("purged the @nleite contaminated
data!");
cb(result);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#remove

45. Remove
MongoClient.connect(uri, function(err, db) {
assert.equal(null, err);
console.log("Ok, I can now delete!");
removeDocuments(db, function() {
db.close();
});
});
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#remove

46. Find
var findAllDocuments = function(db, cb){
var collection = db.collection('myDocuments');
//or collection.find()
collection.find({}).toArray(function(err, docs){
assert.equal(err, null);
assert.equal(1, docs.length);
console.log("Gotcha! found "+ docs.length);
console.dir(docs);
cb(docs);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#find

47. Find
var findAllDocuments = function(db, cb){
var collection = db.collection('myDocuments');
//or collection.find()
collection.find({}).toArray(function(err, docs){
assert.equal(err, null);
assert.equal(1, docs.length);
console.log("Gotcha! found "+ docs.length);
console.dir(docs);
cb(docs);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#find

48. Find
var findAllDocuments = function(db, cb){
var collection = db.collection('myDocuments');
//or collection.find()
collection.find({}).toArray(function(err, docs){
assert.equal(err, null);
assert.equal(1, docs.length);
console.log("Gotcha! found "+ docs.length);
console.dir(docs);
cb(docs);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#find

49. Flexibility

50. Schema Flexibility

51. Different Schemas
var insertDifferentShapes = function(db, cb){
var doc1 = {"name": "Norberto", "talks": [
{"nodejs":10}, {"java":15}, "python":11]};
var doc2 = {"name": "Bryan", "webinars": 30};
var coll = db.collection("content")
coll.insertMany( [doc1, doc2], function(err, result){
assert.equal(err, null);
assert.equal(2, result.insertedCount);
console.log("Sweet, inserted "+ result.insertedCount);
cb(result);
});
}
http://docs.mongodb.org/manual/data-modeling/

52. Different Schemas
var insertDifferentShapes = function(db, cb){
var doc1 = {"name": "Norberto", "talks": [
{"nodejs":10}, {"java":15}, "python":11]};
var doc2 = {"name": "Bryan", "webinars": 30};
var coll = db.collection("content")
coll.insertMany( [doc1, doc2], function(err, result){
assert.equal(err, null);
assert.equal(2, result.insertedCount);
console.log("Sweet, inserted "+ result.insertedCount);
cb(result);
});
}
http://docs.mongodb.org/manual/data-modeling/

53. WriteConcerns

54. WriteConcern w:1

55. WriteConcern w:2

56. WriteConcern j:true

57. Different WriteConcerns
var insertSuperImportant = function(db, cb){
var customer = {"name": "Manny Delgado", "age": 14};
var coll = db.collection("customers");
var writeConcern = {"w": "majority"};
col.insertOne( customer, writeConcern, function(err, result){
assert.equal(err, null);
assert.equal(1, result.insertedCount);
console.log("Inserted super important record");
cb(result);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/WriteConcernError.html

58. Different WriteConcerns
var insertSuperImportant = function(db, cb){
var customer = {"name": "Manny Delgado", "age": 14};
var coll = db.collection("customers");
var writeConcern = {"w": "majority"};
col.insertOne( customer, writeConcern, function(err, result){
assert.equal(err, null);
assert.equal(1, result.insertedCount);
console.log("Inserted super important record");
cb(result);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/WriteConcernError.html

59. Read Preference

60. 60
Read Preference
• Read from Primary (default)
ReadPreference.PRIMARY
• Read from Primary Preferably
ReadPreference.PRIMARY_PREFERRED
• Read from Secondary
ReadPreference.SECONDARY
• Read from Secondary Preferably
ReadPreference.SECONDARY_PREFERRED
• Read from Nearest Node
ReadPreference.NEAREST
http://mongodb.github.io/node-mongodb-native/2.0/api/ReadPreference.html

61. Read From Nearest
var readNearestWaterMelonColor = function(db, cb){
var rp = ReadPreference.NEAREST;
var coll = db.collection("products", {ReadPreference:rp});
var query = {"color": "water melon green"};
collection.find(query).toArray(function(err, docs){
assert.equal(err, null);
assert.equal(1, docs.length);
console.log("So many products: "+ docs.length);
console.dir(docs);
cb(docs);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/ReadPreference.html

62. Read From Nearest
var readNearestWaterMelonColor = function(db, cb){
var rp = ReadPreference.NEAREST;
var coll = db.collection("products", {ReadPreference:rp});
var query = {"color": "water melon green"};
collection.find(query).toArray(function(err, docs){
assert.equal(err, null);
assert.equal(1, docs.length);
console.log("So many products: "+ docs.length);
console.dir(docs);
cb(docs);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/ReadPreference.html

63. Read From Nearest
var readNearestWaterMelonColor = function(db, cb){
var rp = ReadPreference.NEAREST;
var coll = db.collection("products", {readPreference:rp});
var query = {"color": "water melon green"};
collection.find(query).toArray(function(err, docs){
assert.equal(err, null);
assert.equal(1, docs.length);
console.log("So many products: "+ docs.length);
console.dir(docs);
cb(docs);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/ReadPreference.html

64. Aggregation

65. Aggregation
var aggregateAvgAgeGender = function( db, cb){
//{age:XX, name:"user name", gender: "M/F"}
var pipeline = [
{$group: { "_id": "$gender", avg_age: {$avg: "$age"}}},
];
var coll = db.collection("users");
var cursor = coll.aggregate(pipeline);
cursor.forEach( function(x){
console.log("Gender " + x._id + " age average " + x.avg_age)
}, function(x) {
cb(cursor);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#aggregate

66. Aggregation
var aggregateAvgAgeGender = function( db, cb){
//{age:XX, name:"user name", gender: "M/F"}
var pipeline = [
{$group: { "_id": "$gender", avg_age: {$avg: "$age"}}},
];
var coll = db.collection("users");
var cursor = coll.aggregate(pipeline);
cursor.forEach( function(x){
console.log("Gender " + x._id + " age average " + x.avg_age)
}, function(x) {
cb(cursor);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#aggregate

67. Aggregation
var aggregateAvgAgeGender = function( db, cb){
//{age:XX, name:"user name", gender: "M/F"}
var pipeline = [
{$group: { "_id": "$gender", avg_age: {$avg: "$age"}}},
];
var coll = db.collection("users");
var cursor = coll.aggregate(pipeline);
cursor.forEach( function(x){
console.log("Gender " + x._id + " age average " + x.avg_age)
}, function(x) {
cb(cursor);
});
}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#aggregate

68. Aggregation
var aggregateAvgAgeGender = function( db, cb){
//{age:XX, name:"user name", gender: "M/F"}
var pipeline = [
{$match:{"age": $gt: 18}},
{$group: { "_id": "$gender", avg_age: {$avg: "$age"}}},
{$project:{"ID": "$_id", "average": "$avg_age" }}
];
var cursor = coll.aggregate(pipeline);
var coll = db.collection("users");
cursor.forEach( function(x){
console.log("Gender " + x._id + " age average " + x.avg_age)
}, function(x) {
cb(cursor);
});}
http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#aggregate

69. ODM's

70. Mongoose

71. 71
Mongoose
• Schema Validation
• Casting
• Business Logic Wrapper
• http://mongoosejs.com/

72. Simple Mongoose
var mongoose = require('mongoose'), assert =
require('assert')
var Schema = mongoose.Schema;
//define a schema
var userSchema = new Schema({ name: String, age:
Number})
//create static members
userSchema.statics.findByName = function( name, cb){
return this.find( {"name": name}, cb);
}
…

73. Simple Mongoose
…
//generate a model
var User = mongoose.model('User', userSchema);
//initiate the new user, validates the given arguments
var u1 = User({name:"Many Delgado", age:14});
//just save it
u1.save(function(err){
assert.equal(null, err);
});

74. 74
Other Projects
Project Repository
MongoSkin https://github.com/kissjs/node-mongoskin
Mongolia https://github.com/masylum/mongolia
Mongojs https://github.com/mafintosh/mongojs
MongoSmash https://github.com/bengl/mongosmash

75. MEAN Stack

76. 76
MEAN Stack
• MongoDB
• Express.js
• Angular JS
• Node.js

77. Express is a minimal and flexible Node.js web
application framework that provides a robust
set of features for web and mobile
applications.

78. AngularJS lets you extend HTML vocabulary
for your application. The resulting
environment is extraordinarily expressive,
readable, and quick to develop

79. Building your first app with MongoDB: Creating
a RESTAPI using the MEAN Stack
https://www.mongodb.com/blog/post/building-
your-first-application-mongodb-creating-rest-
api-using-mean-stack-part-1

80. Meteor

81. Meteor is a complete open source platform
for building web and mobile apps in pure
JavaScript.

82. 82
Meteor
• Responsiveness
• Reactiveness
• Multiplatform
• Unified Package System
• Hot Deploys
https://www.meteor.com/try

83. METEOR: Build IOS andAndroidApps
that are a delight to use
http://www.mongodb.com/blog/post/meteor-
build-ios-and-android-apps-are-delight-use

84. Recap

85. 85
What we talked about today…
• Node.js is a very productive language
– Our driver is highly adopted
– Updated
– Fully compatible
• CRUD Operations
– Insert, Update, Remove, Delete
• Write Concerns
– Flexible to write
• Read Preferences
– Flexible to read
• Aggregation Framework
– Analytics at your fingertips

86. 86
Large Ecosystem
• Mongoose
• Mean Stack
• Meteor
• Many other projects

87. 87
Where to next?
• Questions on the driver:
– https://groups.google.com/forum/#!forum/node-mongodb-native
• Issues:
– https://jira.mongodb.org/browse/NODE/?selectedTab=com.atlass
ian.jira.jira-projects-plugin:summary-panel
• Tutorial:
– http://mongodb.github.io/node-mongodb-native/2.0/
• Todays code:
– https://github.com/nleite/firstappnodejs
• Other:
– http://www.mongodb.com/norberto

88. http://www.mongodb.com/webinar/managing-
mission-critical-app-downtime

89. 89
For More Information
Resource Location
Case Studies mongodb.com/customers
Presentations mongodb.com/presentations
Free Online Training education.mongodb.com
Webinars and Events mongodb.com/events
Documentation docs.mongodb.org
MongoDB Downloads mongodb.com/download
Additional Info info@mongodb.com
Blog blog.mongodb.com

90. 90
Register now: mongodbworld.com
Use Code NorbertoLeite for additional 25% Off
*Come as a group of 3 or more – Save another 25%

91. http://cl.jroo.me/z3/v/D/C/e/a.baa-Too-many-bicycles-on-the-van.jpg
Questions?
@nleite
norberto@mongodb.com
http://www.mongodb.com/norberto