# Errors

All-Images uses conventional HTTP response codes to indicate the success or failure of an API request.

As a general rule:

* Codes in the **`2xx`** range indicate success.
* Codes in the **`4xx`** range indicate incorrect or incomplete parameters (e.g. a required parameter was omitted, or an operation failed with a 3rd party, etc.).
* Codes in the **`5xx`** range indicate an error with All-Images's servers.

All-Images also outputs an error message and an error code formatted in JSON:

<pre class="language-json"><code class="lang-json">{
<strong>    "statusCode": number,
</strong>    "error": string,
    "message": string[]
}
</code></pre>