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Should I Use MongoDB?
NoSQL document database
Proceed with caution
Score
6/10
Maybe — document databases have real use cases, but Postgres covers most of them now.
▲ Pros
- +Schema flexibility is genuinely useful for rapidly evolving data models
- +Atlas managed service is polished — easy to get started
- +Aggregation pipeline is powerful for complex data transformations
- +Good for content management, IoT data, and unstructured documents
▼ Cons
- −Postgres JSONB handles most "flexible schema" use cases better
- −No JOINs by design — denormalization leads to data consistency headaches
- −Mongoose/ODM adds complexity that an ORM on Postgres doesn't need
- −Scaling costs on Atlas are high compared to managed Postgres
◉ Expert Perspectives
Database ArchitectProceed with caution
“In 2026, the question isn't MongoDB vs Postgres. It's: what does MongoDB do that Postgres with JSONB doesn't?”
Startup CTOProceed with caution
“We started with MongoDB for flexibility and migrated to Postgres after 18 months. The joins we needed were always there.”
IoT EngineerGo for it
“For time-series sensor data with varying schemas, MongoDB's document model is still the right tool.”
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