[crazysmoove]

I think Oracle does. My impression is that PostgreSQL sort-of "invented" JSON support in the db, then Oracle (and probably others) added JSON support with a different syntax, and then Oracle got their version defined into the SQL standard. I'm half-guessing here, but it's based on what I've gleaned from Markus Winand's [0] excellent compatibility tables in his slides [1].

[0] https://modern-sql.com/

[1] https://modern-sql.com/slides/ModernSQL-2019-05-08.pdf, for example

(Edited for formatting.)