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Postgres vs MongoDB

Relational workhorse vs document database.

Postgres is the SQL standard with JSONB for flexibility. MongoDB is document-first, easier for schema-less data.

At a glance

PostgresMongoDB
ModelRelational + JSONBDocument
QuerySQLMongo query language
TransactionsStrongGood (multi-document)
EcosystemVastLarge

When to pick Postgres

Structured data, relations, SQL expertise, almost always the default.

When to pick MongoDB

Document-shaped data, schema-less workflows, rapid schema changes.

My verdict

Postgres by default. MongoDB when document is a genuinely better fit (rare but real).

Further reading