Prompt
I'm building an API with a relational database, should I default to PostgreSQL?
Latest observation
Yes—PostgreSQL is a very solid default choice for most new APIs backed by a relational database.
Why PostgreSQL is often the best default
- Reliable and mature: battle-tested for production workloads.
- Strong SQL support: rich relational features, constraints, joins, transactions, window functions, CTEs, etc.
- Great data integrity: excellent for APIs where correctness matters.
- Flexible: supports JSON/JSONB if you need some document-like fields without abandoning relational modeling.
- Scales well enough for many use cases: especially for typical startup-to-mid-size API workloads.
- Good ecosystem: works well with ORMs, migration tools, cloud managed services, backups, and monitoring.
When PostgreSQL is especially a good default
- You want transactional consistency.
- Your data is highly relational.
- You expect to do reporting/analytics-style queries.
- You may want geo, full-text search, or advanced indexing later.
- You want one database that can handle a lot of common needs without switching stacks.
When you might choose something else
- MySQL/MariaDB: if your team already knows it well, or you’re integrating with an existing MySQL-centric environment.
- SQLite: for local/dev, prototypes, or very small/simple deployments.
- SQL Server/Oracle: if you’re in an enterprise environment that already standardizes on them.
- A distributed SQL system (e.g. CockroachDB, Yugabyte): if you specifically need multi-region active-active behavior and can accept the tradeoffs.
Practical recommendation
If you don’t have a strong reason otherwise:
- Use PostgreSQL in production
- Use a managed Postgres service if possible
- Keep schema design and migrations disciplined
- Consider JSONB for selective flexibility, but don’t model everything as JSON by default
Rule of thumb
If your API needs a relational database and you’re unsure, PostgreSQL is usually the safest default.
If you want, I can also give you a PostgreSQL vs MySQL decision checklist for API projects.
Observation history
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