Writing JSON

The contents of tables or the result of queries can be written directly to a JSON file using the COPY statement. For example:

CREATE TABLE cities AS
    FROM (VALUES ('Amsterdam', 1), ('London', 2)) cities(name, id);
COPY cities TO 'cities.json';

This will result in cities.json with the following content:

{"name":"Amsterdam","id":1}
{"name":"London","id":2}

See the COPY statement for more information.