I wish uuid-ossp was in there... Being able to generate type 4 and 5 UUIDs on the database side is extremely convenient, especially during migrations.
gen_random_uuid()
Exists in the pgcrypto extension.Only does UUID 4, which should work for many applications.
For the record, uuid-ossp is a steaming pile and there's no reason to use it for anything on a modern Postgres install.
There's no reason to use it and incorporating it into projects just creates headaches down the road.
[1]: https://www.postgresql.org/message-id/flat/52CF07C2.3080101%...