Flexible Schema

038 | Databases in Detail: MongoDB — A Flexible Document-Oriented Database

30.06.2025

We’re wrapping up our database series with MongoDB — one of the most popular document-oriented NoSQL databases. Unlike relational systems like MySQL and PostgreSQL, MongoDB offers high flexibility, scalability, and performance for working with semi-structured and unstructured data.


What is MongoDB?

MongoDB is a free and open-source (SSPL/Apache 2.0) document-oriented NoSQL database that stores data in a JSON-like format called BSON (Binary JSON). Unlike relational databases that use fixed schemas, MongoDB stores “documents” (analogous to records) with a dynamic schema. This means documents in the same “collection” (similar to a table) can have different sets of fields — giving developers incredible flexibility.