mongo
The MongoDB Database
MongoDB is a NoSQL database that stores data as flexible JSON-like documents instead of rigid rows and columns, making it easy to work with nested or evolving data structures in your applications.
MongoDB is a popular database — a system for storing and retrieving data in applications. Unlike traditional databases that organize data into rigid rows and columns (like a spreadsheet), MongoDB is a NoSQL (non-relational) database that stores data as flexible documents, similar to JSON objects. This makes it easier to store complex, nested, or varying data structures without having to redesign a schema every time your data shape changes.
The repository contains the source code for the MongoDB database server itself. The main component is mongod, the database server process, and mongos, a sharding router that helps distribute data across multiple servers when the dataset is too large for a single machine. There is also a shell tool called mongosh for interacting with the database directly from the command line.
You would use MongoDB when building applications that need to store structured or semi-structured data — like user profiles, product catalogs, logs, or content — especially when the shape of that data might evolve over time or when you need to store nested objects. It's also available as a managed cloud service called Atlas if you don't want to run your own server. Client drivers are available for most programming languages.
The database is written in C++. Versions released after October 2018 are under the Server Side Public License (SSPL), which imposes restrictions if you offer MongoDB as a hosted service; older versions use the AGPL license.
Where it fits
- Store user profiles, product catalogs, or content records where the data shape varies between documents.
- Build an app that needs to evolve its data model frequently without running migration scripts every time.
- Scale a large dataset across multiple servers using MongoDB's built-in sharding for high-traffic applications.