PostgreSQL Output to JSON format

Question

I have data that need to result in JSON format. I am using the following code:

WITH cte AS (
    SELECT 'docker' AS type, '564df5a6sdf4654f6da4sf56a' AS id, 1 AS segment, 1 AS value
    UNION ALL
    SELECT 'docker' AS type, '564df5a6sdf4654f6da4sf56a' AS id, 2 AS segment, 100 AS value
    )
SELECT type
     , id
     , json_agg(json_build_object(segment, value)) AS json_result
FROM cte
GROUP BY type
       , id

Result for json_result column is: [{"1" : 1}, {"2" : 100}]

But the desired result is: {"1" : 1, "2" : 100}

How to adjust the query so it returns the desired output?

Answer 1

Use json_object_agg() :

SELECT type
     , id
     , json_object_agg(segment, value) AS json_result
FROM cte
GROUP BY type
       , id