MongoDB Shell and Connection Basics

mongosh

# Open an interactive shell to a local deployment.

mongosh "mongodb://localhost:27017/appdb"

# Connect directly with a full connection string.

mongosh "mongodb://dbuser:secret@localhost:27017/appdb?authSource=admin"

# Pass username, password, and auth database.

show dbs

# Show visible databases in the deployment.

use appdb

# Change the current database context.

show collections

# Show collections in the current database.

db.getCollectionNames()

# Return an array of collection names.

db.stats()

# Inspect size, object count, and storage metrics.

db.createCollection("users")

# Create a collection explicitly.

db.users.insertOne({ name: "Ada", email: "ada@example.com", active: true })

# Create a starter document.

db.users.find().limit(5)

# Preview documents from a collection.

db.users.find({ active: true }).pretty()

# Format documents for easier reading.

db.users.drop()

# Remove a collection and its data.