Check if key exists in a JSON with PL/pgSQL?

Question

I\'m trying to check if a key exists in a JSON sent as parameter in a PL/pgSQL function.

Here is the function.

CREATE FUNCTION sp_update_user(user_in         


        

Answer 1

Found a simpler solution that checks if the json key have a value.

IF (user_info->>'username') IS NOT NULL
THEN
      RAISE NOTICE 'username';
      UPDATE users SET username = user_info->>'username' WHERE id = sp_update_user.user_id;
END IF;

This checks if the key 'username' in the json have a volume other than NULL.