> For the complete documentation index, see [llms.txt](https://fusionauth.io/docs/llms.txt)

# Retrieve System Version

API documentation for the FusionAuth Retrieve System Version API.

# Retrieve System Version

The Version API is used to retrieve the current version of FusionAuth.

## Request

[!API Key Authentication](https://fusionauth.io/docs/apis/authentication.md#api-key-authentication)[!Basic Authentication using an API Key](https://fusionauth.io/docs/apis/authentication.md#basic-authentication-using-an-api-key)

Return the FusionAuth system version

GET/api/system/version

OpenAPI Spec

## Response

*Response Codes*

| Code | Description |
| --- | --- |
| 200 | The request was successful. The response will contain a JSON body. |
| 401 | You did not supply a valid Authorization header. The header was omitted or your API key was not valid. The response will be empty. See [Authentication](https://fusionauth.io/docs/apis/authentication.md). |
| 500 | There was an internal error. A stack trace is provided and logged in the FusionAuth log files. The response will be empty. |

### Response Body

`version`String

The version of the running FusionAuth instance.

Example JSON Response

```json
{
  "version": "1.27.0"
}
```