The answer
Because MongoDB stores JSON-like documents, which maps naturally to JavaScript objects. Mongoose provides schemas and validation. This makes MongoDB the default choice in the Node.js ecosystem.
SQL vs NoSQL Databases Explained: How to Choose for Your App
Why does Node.js often use MongoDB?
More FAQs in SQL vs NoSQL Databases Explained: How to Choose for Your App
SQL databases are relational with tables, rows, and a fixed schema, using ACID transactions and complex joins. NoSQL databases are non-relational with flexible schemas, designed for horizontal scaling and document-like data.
When data is highly relational (users, orders, products with connections), when ACID transactions are essential (banking, payments), and when complex queries and joins are common.
When data is document-like (JSON), when the schema evolves rapidly, when horizontal scaling is needed, and when you want fast iteration without migrations.
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