diff --git a/langchain-core/src/messages/utils.ts b/langchain-core/src/messages/utils.ts
index ee31d8245b27..1f89248afb1a 100644
--- a/langchain-core/src/messages/utils.ts
+++ b/langchain-core/src/messages/utils.ts
@@ -115,7 +115,11 @@ function _constructMessageFromParams(
     });
   } else {
     throw new Error(
-      `Unable to coerce message from array: only human, AI, or system message coercion is currently supported.\n\nReceived:${params}`
+      `Unable to coerce message from array: only human, AI, or system message coercion is currently supported.\n\nReceived: ${JSON.stringify(
+        params,
+        null,
+        2
+      )}`
     );
   }
 }