Node.js – Create Collection in MongoDB
In this Node.js Tutorial, we shall learn to Create Collection in MongoDB Database from Node.js Application, using db.createCollection() method, with an example.
Following is a step by step guide with an example to create a collection in MongoDB from Node.js Application.
- Start MongoDB Service. Run the following command to start MongoDB Service sudo service mongod start
- 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. While the Mongo Shell starts up, it echoes back the base url of MongoDB.arjun@nodejs:~$ mongoMongoDB shell version v3.4.9connecting to: mongodb://127.0.0.1:27017MongoDB server version: 3.4.9Server has startup warnings:2017-10-29T18:15:36.110+0530 I STORAGE [initandlisten]mongodb://127.0.0.1:27017
- Prepare the complete URL. Append the Database name you want to connect to (say newdb), to the base URL. mongodb://127.0.0.1:27017/newdb
- Create a MongoClient. var MongoClient = require('mongodb').MongoClient;
- Make connection from MongoClient to the MongoDB Server with the help of URL. Once the MongoClient is done trying to make a connection, the callback function receives error and db object as arguments.MongoClient.connect(url, <callback_function>);
If the connection is successful, the db object points to the database, newdb.
- Create a MongoDB Collection in the database. Following is the syntax of createCollection() method used to create collection in MongoDB from Node.js. db.createCollection(<collection_name>, <callback_function>)
collection_name Name of the new MongoDB Collection, that we would like to create callback_function 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.
Example Node.js program
// 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"); // create 'users' collection in newdb database db.createCollection("users", function(err, result) { if (err) throw err; console.log("Collection is created!"); // close the connection to db when you are done with it db.close(); }); }); |
arjun@tutorialkart:~/workspace/nodejs/mongodb$ node node-js-mongodb-create-collection.js Switched to newdb database Collection is created! |
Reference
MongoDB Tutorial – Learn MongoDB from basics with Examples.
Conclusion :
In this Node.js MongoDB tutorial : Node.js – Create Collection in MongoDB, we have learnt to create a collection in a database from Node.js Application using mongodb package. In our next tutorial – Node.js MongoDB Delete Collection, we shall learn to delete the collection, or you may skip to Node.js Insert Document(s) to MongoDB Collection.