
Development Versions: [devel](https://www.postgresql.org/docs/devel/view-pg-available-extensions.html "PostgreSQL devel - 53.3. pg_available_extensions")

The `pg_available_extensions` view lists the extensions that are available for installation. See also the [`pg_extension`](https://www.postgresql.org/docs/current/catalog-pg-extension.html "52.22. pg_extension") catalog, which shows the extensions currently installed.

**Table 53.3. `pg_available_extensions` Columns**

| 
Column Type

Description

 |
| --- |
| 

`name` `name`

Extension name

 |
| 

`default_version` `text`

Name of default version, or `NULL` if none is specified

 |
| 

`installed_version` `text`

Currently installed version of the extension, or `NULL` if not installed

 |
| 

`comment` `text`

Comment string from the extension's control file

 |

The `pg_available_extensions` view is read-only.
