MongoDB Crib Sheet

Tags: mongodb

Written by: Tushar Sharma

MongoDB Crib Sheet. Mongo uses BSON to store data

Document Structure (BSON)

{
  _id: ObjectId("507f191e810c19729de860ea"),
  name: "Alice Chen",
  salary: NumberLong(230000),
  designation: "Principal Engineer",
  teams: ["platform-engineering", "database-ops"],
  meta: {
    badge: "SDE-III",
    clearance: "Level-5"
  }
}

• Binary JSON format with type-rich encoding

• Flexible schema (no fixed column structure)

• Nested documents (up to 100 levels deep)

• Automatic _id generation (12-byte unique identifier)

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