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Lesson 26 — MongoDB & Mongoose Cheat Sheet
In one line: MongoDB stores flexible JSON-like documents; Mongoose adds schemas and a clean model API for real persistence.
Key Ideas
1MongoDB. NoSQL, document-based database.
2Schema. Defines a document's shape and rules.
3Model. A schema compiled to a usable class.
4mongoose.connect(). Connects using a URI.
5Query methods. find, findById, create, findByIdAndUpdate, findByIdAndDelete.
CRUD
const schema = new mongoose.Schema({
title: {type:String, required:true},
hours: Number
});
const Course = mongoose.model('Course', schema);
await Course.create({title:'CSS Grid', hours:3});
const all = await Course.find();
await Course.findByIdAndUpdate(id, {hours:4});
await Course.findByIdAndDelete(id);