diff --git a/apps/canvas/back/src/index.ts b/apps/canvas/back/src/index.ts
index 8bb1a81..295bdf3 100644
--- a/apps/canvas/back/src/index.ts
+++ b/apps/canvas/back/src/index.ts
@@ -23,7 +23,7 @@
 		resp.header("Content-Type", "application/json");
 		resp.write(
 			JSON.stringify({
-				id,
+				id: id.toString(),
 			}),
 		);
 	} catch (e) {