What’s the default database for Nest.js backends?

PostgreSQL—pairs perfectly with Prisma/TypeORM for typed schemas and migrations.

Is MongoDB schema-less a real advantage?

No—design still matters for indexes and queries; it just skips formal migrations.

When to use both PostgreSQL and MongoDB?

Core transactions/users in Postgres, events/content in Mongo for polyglot setups.

Should I migrate from MongoDB to PostgreSQL?

Only if joins, reporting, or transactions hurt—don’t chase hype.

🗄️ Databases & Backend

PostgreSQL Crushes MongoDB for 80% of Backends—My 20-Year Rule

Stack Overflow's 2023 survey shows PostgreSQL in 48% of pro backends, MongoDB at just 13%. I've seen the NoSQL hype crash—now I default to Postgres unless your data screams 'documents'.

theAIcatchup Apr 10, 2026 4 min read

PostgreSQL tables versus MongoDB documents comparison illustration

⚡ Key Takeaways

Default to PostgreSQL for structured data, relations, transactions—powers 48% of pro backends. 𝕏
MongoDB for variable, nested data read as units; avoid unless it fits perfectly. 𝕏
Postgres JSONB bridges the gap—unique edge killing NoSQL excuses. 𝕏

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#MongoDB #PostgreSQL #backend databases #database choice #database selection

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