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jsonpostgresqljsonbpostgresql-13

Identify json type in postgresql

Is there a function - or a way to easily determine the json data type in postgresql?

For example:

select key, value, pg_typeof(value) FROM jsonb_each('{"foo":1,"bar":"2","ack":[1,2,3]}'::jsonb)

Returns:

key value   pg_typeof
ack [1, 2, 3]   jsonb
bar "2" jsonb
foo 1   jsonb

How would I determine that the value for ack is an array, bar is a string, and foo is a number?

Solution

  • From here JSON operators, jsonb_typeof:

     select key, value, jsonb_typeof(value) FROM jsonb_each('{"foo":1,"bar":"2","ack":[1,2,3]}'::jsonb);
 key |   value   | jsonb_typeof 
-----+-----------+--------------
 ack | [1, 2, 3] | array
 bar | "2"       | string
 foo | 1         | number