JSON output in Postgresql

Question

I hope I am not missing something very obvious here,
I want to get JSON output from a postgres function (I imagine many other had already needed this) and I\'d be happy

Answer 1

There is built-in support for JSON since PostgreSQL 9.2 and it has increased with many other features in more recent versions(For example: JSON functions in PostgreSQL 0.4).

Specially the row_to_json converts a record into a JSON object and the array_to_json turns arrays into JSON arrays.

For example, both functions can be combined to easily turn the results of a SELECT query into JSON:

SELECT array_to_json(array_agg(row_to_json(t))) FROM 
    (SELECT col1, col2, col3 FROM example_table) t