SQL to JSON Guide: Query Results, FOR JSON, and json_agg in Postgres
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. PostgreSQL: rowtojson and jsonagg PostgreSQL has the richest JSON generation toolset. The key functions are: | Function | What it does | |----------|-------------| | | Converts a single row to a JSON object | | | Aggregates values into a JSON array | | | Build…
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