Should I choose a database based on my team's skills?
Yes, partly. A database your team knows is better than a theoretically better one they do not. The learning curve matters for development speed, and a team proficient in one database will build faster than one learning a new one.
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Consider data shape (relational vs document), query patterns (joins vs lookups), scalability (vertical vs horizontal), team skills, and ecosystem fit. MongoDB for JSON documents; PostgreSQL for relational data.
Because JSON documents map naturally to JavaScript objects, Mongoose provides schemas, and the ecosystem (tutorials, libraries, hosting) is mature. This makes MongoDB the default choice in the Node.js world.
For highly relational data, complex queries, and ACID transactions. PostgreSQL is an excellent, modern SQL database with JSON support, making it a strong choice for many Node.js apps with relational data.
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