{"id":105016,"date":"2021-12-22T09:00:23","date_gmt":"2021-12-22T03:30:23","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=105016"},"modified":"2021-12-22T12:41:31","modified_gmt":"2021-12-22T07:11:31","slug":"nodejs-mongodb-tutorial","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/nodejs-mongodb-tutorial\/","title":{"rendered":"Node.js MongoDB Tutorial"},"content":{"rendered":"

In this article, we will see how we can use the mongo db database with node js. We will look at how to create a database, connect databases, create a collection and other methods with code and examples.<\/p>\n

Install MongoDB:<\/h3>\n

To install MongoDB on your device run the below command:<\/p>\n

Npm install mongodb.<\/pre>\n
Connecting to mongodb?<\/h3>\n
To connect with mongo db we will use the connect method.<\/p>\n
Code for connecting to mongodb:<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/dataflair\";\r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n});\r\n<\/pre>\n
Creating database:<\/h3>\n
To create a database, we will use a MongoClient object. We will pass a connection URL and the name of the database. If it does not exist, MongoDB will create the database, and connect to it.<\/p>\n
Code for Creating database:<\/h4>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/dataflair\";\r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    console.log(\"Database created!\");\r\n    db.close();\r\n});\r\n<\/pre>\n
Output<\/strong>:<\/p>\n
\"nodejs<\/a><\/p>\n
Creating collection:<\/h3>\n
We will use the create collection method to create a collection.<\/p>\n
Code for Creating collection:<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n    dbo.createCollection(\"students\", function (err, res) {\r\n        if (err) throw err;\r\n        console.log(\"Collection created!\");\r\n        db.close();\r\n    });\r\n});\r\n<\/pre>\n
Output<\/strong>:<\/p>\n
\"nodejs<\/a><\/p>\n
Inserting into collection:<\/h3>\n
We will use the insert one method to insert into the collection.<\/p>\n
Code for inserting:<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n    var obj = { name: \"abc\", address: \"India\" };\r\n    dbo.collection(\"students\").insertOne(obj, function (err, res) {\r\n        if (err) throw err;\r\n        console.log(\"1 document inserted!\");\r\n        db.close();\r\n    });\r\n});\r\n<\/pre>\n
Output<\/strong>:<\/p>\n
\"nodejs<\/a><\/p>\n
MongoDB Find query:<\/h3>\n
To find a particular document in mongodb, we use the find method.<\/p>\n
Code for find()<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\n \r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n \r\n \r\n    dbo.collection(\"students\").findOne({}, function (err, res) {\r\n        if (err) throw err;\r\n        console.log(res);\r\n        db.close();\r\n    });\r\n});<\/pre>\n
Output<\/strong>:<\/p>\n
{
\n_id: new ObjectId(“616d7984ab589958610e0257”),
\nname: ‘abc’,
\naddress: ‘India’
\n}<\/div>\n
MongoDB Filter result :<\/h3>\n
We will use the find method and pass the query as the first argument to it.<\/p>\n
Code for filtering the result:<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\n \r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n    var query = { address: \"India\" };\r\n    dbo.collection(\"students\").find(query).toArray(function (err, res) {\r\n        if (err) throw err;\r\n        console.log(res);\r\n        db.close();\r\n    });\r\n});\r\n<\/pre>\n
Output<\/strong><\/p>\n
\"nodejs<\/a><\/p>\n
MongoDB Sort Function:<\/h3>\n
To sort the data in some order, use the sort function.<\/p>\n
Code for sorting<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\n \r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n    dbo.collection(\"students\").find().sort({ name: 1 }).toArray(function (err, res) {\r\n        if (err) throw err;\r\n        console.log(res);\r\n        db.close();\r\n    });\r\n});<\/pre>\n
Output<\/strong>:<\/p>\n
[
\n{
\n_id: new ObjectId(“616d7984ab589958610e0257”),
\nname: ‘abc’,
\naddress: ‘India’
\n},<\/div>\n
\u00a0 \u00a0 {
\n_id: new ObjectId(“616d7ac3895eb21861a35ad0”),
\nname: ‘xyz’,
\naddress: ‘delhi’
\n}
\n]<\/div>\n
MongoDB Limit Function:<\/h3>\n
To get a fixed amount of information, we limit the result by using the limit function.<\/p>\n
Code for limit:<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\n \r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n    dbo.collection(\"students\").find().limit(1).toArray(function (err, res) {\r\n        if (err) throw err;\r\n        console.log(res);\r\n        db.close();\r\n    });\r\n});\r\n<\/pre>\n
Output<\/strong>:<\/p>\n
[
\n{
\n_id: new ObjectId(“616d7984ab589958610e0257”),
\nname: ‘abc’,
\naddress: ‘India’
\n}
\n]<\/div>\n
MongoDB Deleting document:<\/h3>\n
We will use the delete one method to delete a single document. To delete multiple documents, use the delete many method.<\/p>\n
Code for deleting documents:<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\n \r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n    var query = { address: \"India\" };\r\n    dbo.collection(\"students\").deleteOne(query, function (err, res) {\r\n        if (err) throw err;\r\n        console.log(\"1 item deleted\");\r\n        db.close();\r\n    });\r\n});\r\n<\/pre>\n
Output<\/strong>:<\/p>\n
\"nodejs<\/a><\/p>\n
MongoDB Join Method:<\/h3>\n
In order to join two collections, we use the join method.<\/p>\n
Code for join<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\n \r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n    dbo.collection(\"schools\").aggregate([\r\n        {\r\n            $lookup:\r\n            {\r\n                from: 'students',\r\n                localField: '_id',\r\n                foreignField: '_id',\r\n                as: 'studentdetails'\r\n            }\r\n        }\r\n    ]).toArray(function (err, res) {\r\n        if (err) throw err;\r\n        console.log(res);\r\n        db.close();\r\n    });\r\n});\r\n<\/pre>\n
Output<\/strong>:<\/p>\n
[
\n{
\n_id:1,
\nSchoolname:Abc delhi,studentdetails:
\n{
\n_id: new ObjectId(“616d7984ab589958610e0257”),
\nname: ‘abc’,
\naddress: ‘India’,
\n}
\n}
\n]<\/div>\n
MongoDB Dropping collection:<\/h3>\n
We will use the drop() method to delete a collection;<\/p>\n
Code for dropping collection:<\/strong><\/p>\n
var MongoClient = require('mongodb').MongoClient;\r\nvar url = \"mongodb:\/\/localhost:27017\/\";\r\n \r\nMongoClient.connect(url, function (err, db) {\r\n    if (err) throw err;\r\n    var dbo = db.db(\"dataflair\");\r\n    var query = { address: \"India\" };\r\n    dbo.collection(\"students\").drop(function (err, res) {\r\n        if (err) throw err;\r\n        console.log(\"collection deleted\");\r\n        db.close();\r\n    });\r\n});\r\n<\/pre>\n
Output<\/strong>:<\/p>\n
\"nodejs<\/a><\/p>\n
Conclusion:<\/h3>\n
We hope you were able to learn using mongodb with node js. Do check the DataFlair website for other amazing articles.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this article, we will see how we can use the mongo db database with node js. We will look at how to create a database, connect databases, create a collection and other methods...<\/p>\n","protected":false},"author":5,"featured_media":105049,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25259],"tags":[25995,8815,25994,25993],"class_list":["post-105016","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-node-js-tutorials","tag-mongodb-delete-documnet","tag-mongodb-drop-collection","tag-mongodb-join-method","tag-node-js-mongodb"],"yoast_head":"\nNode.js MongoDB Tutorial - DataFlair<\/title>\n<meta name=\"description\" content=\"Learn about Nodejs MongoDB. 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