”;
A MongoDB database is made up of one or more Collections. A Collection is a group of document objects. Once a database is created on the MongoDB server (a standalone server or a on a shared cluster in MongoDB Atlas), you can then create Collections in it. The mongodb driver for Node.js has a cerateCollection() method, that returns a Collection object.
Collection in MongoDB is similar to the table in a relational database. However, it doesn”t have a predefined schema. Each document in a collection may consist of variable number of k-v pairs not necessarily with same keys in each document.
To create a collection, get the database object from the database connection and call the createCollection() method.
db.createCollection(name: string, options)
The name of the collection to create is passed as the argument. The method returns a Promise. Collection namespace validation is performed server-side.
const dbobj = await client.db(dbname); const collection = await dbobj.createCollection("MyCollection");
Note that the collection is implicitly created when you insert a document in it even if it is not created before insertion.
const result = await client.db("mydatabase").collection("newcollection").insertOne({k1:v1, k2:v2});
Example
The following Node.js code creates a Collection named MyCollection in a MongoDB database named mydatabase.
const {MongoClient} = require(''mongodb''); async function main(){ const uri = "mongodb://localhost:27017/"; const client = new MongoClient(uri); try { // Connect to the MongoDB cluster await client.connect(); await newcollection(client, "mydatabase"); } finally { // Close the connection to the MongoDB cluster await client.close(); } } main().catch(console.error); async function newcollection (client, dbname){ const dbobj = await client.db(dbname); const collection = await dbobj.createCollection("MyCollection"); console.log("Collection created"); console.log(collection); }
The MongoDB Compass shows that the MyCollection is created in mydatabase.
You can also verify the same in MongoDB shell.
> use mydatabase < switched to db mydatabase > show collections < MyCollection
”;