How to create a JSON object from array of key/value pairs in PostgreSQL®?

PostgreSQL® offers two types of data types to handle JSON data, JSON and JSONB, you can use the function json_object (jsonb_object for JSONB) to create a JSON object from an array of key/value pairs.

NOTE: To review the differences between JSON and JSONB check out the related article.

NOTE: more info is available in the PostgreSQL JSON functions documentation page

Create a JSON object from an arrays of keys/values pairs with the json_object function

You can create a JSON object from two arrays (one of keys and one of values) with the json_object (jsonb_object for JSONB) function

select 
    jsonb_object(
      '{{name, Francesco}, {pizza, Margherita}}');

Result

                 jsonb_object
----------------------------------------------
 {"name": "Francesco", "pizza": "Margherita"}
(1 row)

Review all the JSON PostgreSQL use-cases listed in the main page