Node.js MongoDB Create Collection

Node.js MongoDB Create Collection

MongoDB stores data in collections, which are similar to tables in traditional databases. When working with MongoDB in Node.js, you can create a new collection using the official MongoDB driver and the createCollection() method.

In this tutorial, we will learn how to create a MongoDB collection using Node.js, install the MongoDB driver, and use the modern async/await approach with practical examples.

Install the MongoDB Driver

To connect a Node.js application with MongoDB, first install the official MongoDB driver using npm:

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npm install mongodb

Node.js MongoDB Create Collection Example

In this example, we will create an employees collection inside the MongoDatabase database.

// employees.js

const { MongoClient } = require('mongodb');

const url = "mongodb://localhost:27017";
const dbName = "MongoDatabase";

MongoClient.connect(url, function(err, client) {
  if (err) throw err;

  const db = client.db(dbName);

  db.createCollection("employees", function(err) {
    if (err) throw err;

    console.log("Collection is created!");
    client.close();
  });
});

How the Example Works

• MongoClient is imported from the MongoDB driver.
• mongodb://localhost:27017 is the connection URL for the local MongoDB server.
• client.db() selects the database.
• createCollection("employees") creates the employees collection.
• client.close() closes the MongoDB connection after the operation is completed.

Run the Node.js Script

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Save the code in a file named employees.js and run the following command in your terminal:

node employees.js

If the collection is created successfully, you will see the following output:

Collection is created!

Modern Async/Await Version

Modern Node.js applications commonly use async/await because it makes asynchronous code easier to read and maintain.

const { MongoClient } = require('mongodb');

async function run() {
  const client = new MongoClient("mongodb://localhost:27017");

  await client.connect();

  const db = client.db("MongoDatabase");

  await db.createCollection("employees");

  console.log("Collection created!");

  await client.close();
}

run().catch(console.error);

Why Use Async/Await?

The async/await syntax provides a clean way to handle asynchronous MongoDB operations. It also makes the code easier to understand compared to older callback-based approaches.

MongoDB Automatically Creates Collections

You do not always need to explicitly call createCollection(). MongoDB can automatically create a collection when you insert the first document into a collection that does not already exist.

await db.collection("employees").insertOne({
  name: "Rahul",
  department: "IT"
});

For simple applications, explicit collection creation may therefore not be necessary. The createCollection() method is useful when you need to create a collection with specific options or configuration.

MongoDB Create Collection: Key Points

Conclusion

Creating a MongoDB collection in Node.js is simple with the official MongoDB driver. The createCollection() method allows you to explicitly create a collection, while the modern async/await approach makes MongoDB operations cleaner and easier to manage.

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