1 files changed, 3 insertions, 2 deletions
diff --git a/src/node/src/metadata.js b/src/node/src/metadata.js
index 51a9f8a216..33d7ea1cf7 100644
--- a/src/node/src/metadata.js
+++ b/src/node/src/metadata.js
@@ -64,7 +64,7 @@ function normalizeKey(key) {
   if (grpc.metadataKeyIsLegal(key)) {
     return key;
   } else {
-    throw new Error('Metadata key contains illegal characters');
+    throw new Error('Metadata key"' + key + '" contains illegal characters');
   }
 }
 
@@ -79,7 +79,8 @@ function validate(key, value) {
           'keys that don\'t end with \'-bin\' must have String values');
     }
     if (!grpc.metadataNonbinValueIsLegal(value)) {
-      throw new Error('Metadata string value contains illegal characters');
+      throw new Error('Metadata string value "' + value +
+                      '" contains illegal characters');
     }
   }
 }