diff --git a/CHANGELOG.md b/CHANGELOG.md
index 144b8ed..afcf48d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+2.8.1
+=====
+
+* (improvement) Add `debug` in `ApiError`.
+
+
 2.8.0
 =====
 
diff --git a/src/api.ts b/src/api.ts
index 0b3b085..f3c35a9 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -78,6 +78,19 @@ export class ApiError extends Error
 	{
 		return this.#errorMessage;
 	}
+
+	/**
+	 *
+	 */
+	get debug () : Record<string, unknown>
+	{
+		return {
+			data: this.data,
+			errorCode: this.errorCode,
+			errorMessage: this.errorMessage,
+			statusCode: this.statusCode,
+		};
+	}
 }
 
 export class RequestError extends Error