Why was MongoDB used instead of PostgreSQL in the previous project?

The choice of MongoDB over PostgreSQL in a previous project could have been due to several reasons:

• Flexible data schema: MongoDB is a document-oriented database that does not require a fixed schema. This is convenient if the data structure changes frequently or is unknown in advance.

• High scalability: MongoDB scales well horizontally, which is important for projects with large volumes of data and high load.

• Rapid development: The lack of complex schema migrations speeds up development and prototyping.

• Data characteristics: If data is naturally represented as JSON-like documents, MongoDB may be more suitable.

• Performance requirements: In certain scenarios, MongoDB provides higher write and read speeds for specific types of workloads.

While PostgreSQL is a powerful relational database supporting complex queries and transactions, MongoDB is chosen when flexibility and scalability are important, and a strict schema is not required.