diff --git a/app/server/README.md b/app/server/README.md
index 6cc9653..76d5b9b 100644
--- a/app/server/README.md
+++ b/app/server/README.md
@@ -19,6 +19,7 @@ server
 │   ├── schema.ts: Defines the schema for the Headplane configuration.
 ├── headscale/
 │   ├── api-client.ts: Creates the HTTP client that talks to the Headscale API.
+│   ├── api-error.ts: Contains the ResponseError definition.
 │   ├── config-loader.ts: Loads the Headscale configuration (if available).
 │   ├── config-schema.ts: Defines the schema for the Headscale configuration.
 ├── web/
diff --git a/app/server/headscale/api-error.ts b/app/server/headscale/api-error.ts
new file mode 100644
index 0000000..bd87ee6
--- /dev/null
+++ b/app/server/headscale/api-error.ts
@@ -0,0 +1,19 @@
+// Represents an error that occurred during a response
+// Thrown when status codes are >= 400
+export default class ResponseError extends Error {
+	status: number;
+	response: string;
+	responseObject?: Record<string, unknown>;
+
+	constructor(status: number, response: string) {
+		super(`Response Error (${status}): ${response}`);
+		this.name = 'ResponseError';
+		this.status = status;
+		this.response = response;
+
+		try {
+			// Try to parse the response as JSON to get a response object
+			this.responseObject = JSON.parse(response);
+		} catch {}
+	}
+}