---
title: "GET /extensions/{ExtensionIdentifier}"
method: GET
path: "/extensions/{ExtensionIdentifier}"
---

# GET /extensions/{ExtensionIdentifier}

`GET /extensions/{ExtensionIdentifier}`

Returns information about an AppConfig extension.

## Path parameters

- `ExtensionIdentifier` string, required

## Query parameters

- `version_number` integer

## Response `200`

Success

- Extension
  - `Id` string — The system-generated ID of the extension.
  - `Name` string — The extension name.
  - `VersionNumber` integer — The extension version number.
  - `Arn` string — The system-generated Amazon Resource Name (ARN) for the extension.
  - `Description` string — Information about the extension.
  - `Actions` object — The actions defined in the extension.
  - `Parameters` object — The parameters accepted by the extension. You specify parameter values when you associate the extension to an AppConfig resource by using the <code>CreateExtensionAssociation</code> API action. For Lambda extension actions, these parameters are included in the Lambda request object.

## Other responses

- `480` — ResourceNotFoundException
- `481` — InternalServerException
- `482` — BadRequestException

---

[API](https://skmtc.net/aws/apis/appconfig.md) · [All operations](https://skmtc.net/aws/apis/appconfig/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/aws/appconfig/versions/924584438718/schema)