PostgreSQL 9.4.26 Documentation
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# 48.55. `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 48-56. `pg_available_extensions` Columns

Name | 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.

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