MongoDB Cheat Sheet
MongoDB CRUD operations, aggregation pipeline, and indexing strategies.
2 PagesBeginnerApr 24, 2026
CRUD Operations
Create, read, update, delete documents.
javascript
db.users.insertOne({ name: "Alice", age: 30 });db.users.find({ age: { $gt: 18 } });db.users.updateOne({ name: "Alice" }, { $set: { age: 31 } });db.users.deleteOne({ name: "Alice" });
Query Operators
Common comparison and logical operators.
javascript
db.users.find({ age: { $gte: 18, $lte: 65 } });db.users.find({ $or: [{ role: "admin" }, { role: "editor" }] });db.users.find({ tags: { $in: ["vip", "beta"] } });
Aggregation Pipeline
Transform and summarize documents.
javascript
db.orders.aggregate([ { $match: { status: "paid" } }, { $group: { _id: "$customerId", total: { $sum: "$amount" } } }, { $sort: { total: -1 } },]);
Indexing
Speed up queries with indexes.
javascript
db.users.createIndex({ email: 1 }, { unique: true });db.users.getIndexes();
Pro Tip
Index the fields you query and sort on most often — use .explain("executionStats") to verify a query is actually using one.
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