Step 1: Open the MongoDB Shell

Before creating a database, ensure MongoDB is running. Open the Command Prompt (Windows) or Terminal (macOS/Linux) and type:

mongo

Step 2: Check Existing Databases

To list all available databases, run:

show databases

Step 3: Create a New Database

Unlike traditional databases, MongoDB does not use an explicit CREATE DATABASE command. Instead, you switch to a database using the use command:

use myDatabase

Step 4: Insert Data to Activate the Database

MongoDB creates the database only when it has at least one collection with data. To create a collection and insert data, use:

db.users.insertOne({ name: "Alice", age: 25 })

Step 5: Verify the Created Database

Now, check if your database is created:

show databases

Example: Creating Another Database with Multiple Documents

use myNewDB
db.products.insertMany([
  { name: "Laptop", price: 1000 },
  { name: "Mouse", price: 50 },
  { name: "Keyboard", price: 70 }
])
show databases

Conclusion

You have successfully created databases in MongoDB. Remember:
✅ MongoDB creates a database only when data is added.
✅ Use show databases to list all databases.
✅ Use db to check the current database.

Now, you can start building applications with MongoDB! 🚀