How to parse JSON in postgresql

I figured it out, guys

if I have a table books

I can easily write a query

SELECT 
   id, 
   data::json->'name' as name
FROM books;

And it will result in

I can also try to get non-existent column

SELECT 
   id, 
   data::json->'non_existant' as non_existant
FROM books;

And it this case I will get empty result