Why should you care?

A chat app creates messages, reads a room history, updates “delivered”, and sometimes deletes for moderation. Master CRUD before aggregation and indexes.

See it live — copy this example

Open mongosh or MongoDB Compass, select database nosqlverse, then run the example. Change one field and run again.

use NoSQLVerse
db.posts.insertOne({ title: "Hello NoSQLVerse", likes: 0 })
db.posts.find({ title: /NoSQLVerse/ })
db.posts.updateOne({ title: "Hello NoSQLVerse" }, { $set: { likes: 1 } })
db.posts.deleteOne({ title: "Hello NoSQLVerse" })

Run Example »

Edit the code below and click Run to see the result in Toolliyo’s live editor.

What happened?

• insertOne creates.
• find reads with a filter.
• updateOne changes fields with $set.
• deleteOne removes one match.

Practice next

1. Run each line of the example in order.
2. After updateOne, find again and confirm likes is 1.
3. Re-insert a post and stop before delete to keep practice data.
4. Use insertMany with two posts.
5. Update likes with $inc: { likes: 1 } instead of $set.

Remember

Create = insert, Read = find, Update = update/replace, Delete = delete. Always pass a filter for update/delete in real apps. Practice CRUD on a scratch collection first.

Social feed basic loop

Instagram-like apps insert a post, followers read the feed, authors edit captions, and admins delete spam.

Outcome: Those four operations map 1:1 to MongoDB CRUD.