Understanding MongoDB Documents and Collections — A Beginner’s Guide

General
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Description:
MongoDB is a NoSQL database that stores data in documents instead of rows and columns like traditional SQL databases.
A document is a JSON-like object containing key-value pairs, and documents are grouped into collections.

Example:

json

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{ “name”: “John Doe”, “email”: “john@example.com”, “age”: 28 }

Document → The above JSON object.

  • Collection → A group of similar documents (e.g., users collection).

Database → A container holding multiple collections.

Why it’s useful:

  • Flexible schema (no need to define table columns in advance).

  • Great for applications where data shape may change over time.

  • Stores complex data structures (arrays, nested objects) easily.

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