MongoDB

CRUD Commands

Core MongoDB operations for manipulating documents. Master insert, find, update, and delete operations.

10 commands

Pro Tips

Use insertMany for bulk inserts - much faster than individual insertOne calls.

Add { upsert: true } to update operations to insert if not found.

Common Mistakes

updateMany/deleteMany without filter affects ALL documents!

Commands

Insert one

$ db.users.insertOne({ name: "John", age: 30 })

Insert a single document.

Insert many

$ db.users.insertMany([{ name: "A" }, { name: "B" }])

Insert multiple documents.

Find all

$ db.users.find()

Retrieve all documents.

Find with filter

$ db.users.find({ age: { $gt: 25 } })

Find documents matching criteria.

Find one

$ db.users.findOne({ name: "John" })

Retrieve first matching document.

Update one

$ db.users.updateOne({ name: "John" }, { $set: { age: 31 } })

Update first matching document.

Update many

$ db.users.updateMany({ active: false }, { $set: { status: "inactive" } })

Update all matching documents.

Delete one

$ db.users.deleteOne({ name: "John" })

Delete first matching document.

Delete many

$ db.users.deleteMany({ status: "inactive" })

Delete all matching documents.

Replace one

$ db.users.replaceOne({ name: "John" }, { name: "John", age: 32, email: "john@ex.com" })

Replace entire document.