pg_available_extensions
The pg_available_extensions view lists the extensions that are available for installation. See also the pg_extension catalog, which shows the extensions currently installed.
Table pg_available_extensions Columns
| Column Type Description | 
|---|
| 
 Extension name | 
| 
 Name of default version, or  | 
| 
 Currently installed version of the extension, or  | 
| 
 Comment string from the extension's control file | 
The pg_available_extensions view is read-only.