SQL to JSON: Query Results with json_agg and FOR JSON
Convert SQL query results to JSON in PostgreSQL (json_agg, row_to_json), MySQL (JSON_OBJECT), and SQL Server (FOR JSON). Export nested records.
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Tags: sql, json, database
SQL to JSON Guide: Query Results, FOR JSON, and jsonagg in Postgres Every modern database can generate JSON from query results natively. Instead of fetching rows, looping in application code, and building objects manually, you can push that transformation into the database layer — which is often faster, simpler, and more composable. This guide covers the full picture: PostgreSQL's rowtojson and jsonagg, SQL Server's FOR JSON AUTO/PATH, MySQL's JSONOBJECT, SQLite's jsonobject, and what ORM serialization actually does under the hood. --- Why Generate JSON in the Database? Application-side serialization is fine at small scale, but the database approach has real advantages: Fewer round-trips: Return a single JSON column instead of 50 rows that your code assembles into a nested object Nested…
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