How to build a JSON array from a list of elements in PostgreSQL®

PostgreSQL® offers two types of data types to handle JSON data, JSON and JSONB, you can use the function json_build_array (jsonb_build_array for JSONB) to create a JSON array from a list of elements.

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 array from a list of elements with the json_build_array function

You can create a JSON array from a list of elements with the json_build_array (jsonb_build_array for JSONB) function

select 
    jsonb_build_array(1,4,'🍌', 'pizza');

Result

  jsonb_build_array
-----------------------
 [1, 4, "🍌", "pizza"]
(1 row)

NOTE: the array elements can be heterogeneously-typed

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