Node.js - Insert Document(s) to MongoDB Collection - Examples

Node.js ¨C Insert Document(s) to MongoDB Collection ¨C Examples

Node.js ¨C Insert Document(s) to MongoDB Collection

In this Node.js Tutorial, we shall learn to insert one or more documents to MongoDB Collection from Node.js

Application, using insertOne() and insertMany() method respectively, with examples.

Following is a step by step guide with an example to insert documents to MongoDB Collection from Node.js

Application.

1. Start MongoDB Service. Run the following command to start MongoDB Service

sudo service

mongod start

sudo service mongod start

2. Get the base URL to MongoDB Service. A simple hack to know the base url of MongoDB Service is to Open a Terminal and

run Mongo Shell.

Terminal - Mongo Shell

arjun@nodejs:~$

mongo

MongoDB shell version

v3.4.9

connecting

to: mongo

arjun@nodejs:~$

mongodb://127.0.0.1:2

MongoDB shell version v3.4.9

7017

MongoDB

connectingserver

to: mongodb://127.0.0.1:27017

version: 3.4.9

MongoDB

Server

has server

startupversion: 3.4.9

warnings:

Server has startup warnings:

2017-1029T18:15:36.110+0530

2017-10-29T18:15:36.110+0530 I STORAGE [initandlisten]

I STORAGE

[initandlisten]

While the Mongo Shell starts up, it echoes back the base url of MongoDB.

mongodb://127.0.0.1:2

7017

mongodb://127.0.0.1:27017

3. Prepare the complete URL. Append the Database name you want to connect to (say newdb), to the base URL.

mongodb://127.0.0.1:2

7017/newdb

mongodb://127.0.0.1:27017/newdb

4. Create a MongoClient.

var MongoClient =

require('mongodb').Mon

goClient;

var MongoClient = require('mongodb').MongoClient;

5. Make connection from MongoClient to the MongoDB Server with the help of URL.

MongoClient.connect(u

rl,

);

MongoClient.connect(url, );

Once the MongoClient is done trying to make a connection, the callback function receives error and db object as arguments.

If the connection is successful, the db object points to the database, newdb.

6. Insert documents to specified MongoDB Collection. Following is the syntax of insertOne() and insertMay() methods used to

insert documents to collection in MongoDB from Node.js. insertOne()

db.collection().insertOne(<

document>,

)

db.collection().insertOne(, )

insertMany()

db.collection().insertMany(

,

)

db.collection().insertMany(, )

Name of the new MongoDB Collection, that we would like to create

Single document that has to be inserted to MongoDB Collection

Array of documents to be inserted to MongoDB Collection

This Node.js Callback Function is called after Node has tried creating a collection, and ready

with the result. The callback function receives error and result object as arguments.

insertOne() ¨C Example Node.js program

node-js-mongodb-insert-document.js

// we create 'users'

collection in newdb

database

var url =

"mongodb://localhost:2

7017/newdb";

// we create 'users' collection in newdb database

var url = "mongodb://localhost:27017/newdb";

// create a client to mongodb

var MongoClient = require('mongodb').MongoClient;

// make client connect to mongo service

MongoClient.connect(url, function(err, db) {

if (err) throw err;

// db pointing to newdb

console.log("Switched to "+db.databaseName+" database");

// document to be inserted

var doc = { name: "Roshan", age: "22" };

// insert document to 'users' collection using insertOne

db.collection("users").insertOne(doc, function(err, res) {

if (err) throw err;

console.log("Document inserted");

// close the connection to db when you are done with it

db.close();

});

});

Output

$ node node-jsmongodb-insertdocument.js

Switched to newdb

database

$ node node-js-mongodb-insert-document.js

Document inserted

Switched to newdb database

Document inserted

Mongo Shell

> use newdb

switched to db newdb

> show collections

users

>>db.users.find({});

use newdb

{ "_id" :

switched to db newdb

ObjectId("5a127729a41

5612642e3d6ad"),

> show collections

"name" : "Roshan",

users : "22" }

"age"

>

> db.users.find({});

{ "_id" : ObjectId("5a127729a415612642e3d6ad"), "name" : "Roshan", "age" : "22" }

>

insertMany() ¨C Example Node.js program

node-js-mongodb-insert-many-documents.js

// we create 'users'

collection in newdb

database

var url =

"mongodb://localhost:2

// we create 'users' collection in newdb database

7017/newdb";

var url = "mongodb://localhost:27017/newdb";

// create a client to

mongodb

// create

a client=to mongodb

var

MongoClient

require('mongodb').Mon

var MongoClient = require('mongodb').MongoClient;

goClient;

// make client connect

// mongo

make client

connect to mongo service

to

service

MongoClient.connect(u

MongoClient.connect(url, function(err, db) {

rl, function(err, db) {

if (err)

throw

if (err)

throw

err;err;

// db

pointing

to to newdb

// db pointing

newdb

console.log("Switched

console.log("Switched to "+db.databaseName+" database");

to

"+db.databaseName+"

database");

// documents to be inserted

var docs = [{

"Udat", age: "21" },

// documents

to name:

be

inserted

{ name: "Karthik", age: "24" },

var docs = [{ name:

name:

"Udat", age: {"21"

}, "Anil", age: "23" }];

{ name: "Karthik",

age: "24" },

{//name:

age:

insert "Anil",

multiple

documents to 'users' collection using insertOne

"23" }];

db.collection("users").insertMany(docs, function(err, res) {

// insert

multiple

if (err)

throw err;

documents to 'users'

console.log(res.insertedCount+"

documents inserted");

collection

using

insertOne

// close the connection to db when you are done with it

db.collection("users").i

nsertMany(docs,

db.close();

function(err, res) {

if });

(err) throw err;

});

console.log(res.inserte

dCount+" documents

inserted");

// close the

Output

connection to db when

you are done with it

$ db.close();

node node-jsmongodb-insert-many});

documents.js

});

Switched to newdb

database

$ node node-js-mongodb-insert-many-documents.js

3 documents inserted

Switched to newdb database

3 documents inserted

Mongo Shell

> db.users.find({});

{ "_id" :

ObjectId("5a127729a41

5612642e3d6ad"),

"name" : "Roshan",

"age" : "22" }

{ "_id" :

ObjectId("5a1278efecc

5062794f4ed8d"),

> db.users.find({});

{ "_id" : ObjectId("5a127729a415612642e3d6ad"), "name" : "Roshan", "age" : "22" }

{ "_id" : ObjectId("5a1278efecc5062794f4ed8d"), "name" : "Udat", "age" : "21" }

{ "_id" : ObjectId("5a1278efecc5062794f4ed8e"), "name" : "Karthik", "age" : "24" }

{ "_id" : ObjectId("5a1278efecc5062794f4ed8f"), "name" : "Anil", "age" : "23" }

The first entry was from first example, and the rest three have been inserted with this example.

Reference

MongoDB Tutorial ¨C Learn MongoDB from basics with Examples.

Conclusion :

In this Node.js MongoDB tutorial : Node.js ¨C Insert Document(s) to MongoDB Collection, we have learnt to

insert one or more documents to MongoDB Collection using insertOne() and insertMany() methods, from

Node.js Application using mongodb package. In our next tutorial ¨C Node.js MongoDB Find, we shall learn to

query documents from MongoDB Collection.

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Node.js - Add new functions to Module

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Node.js - Override functions of Module

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Node.js - Callback Function

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Node.js - forEach

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