diff --git a/index.html b/index.html
index 496ec69f..72cb7638 100644
--- a/index.html
+++ b/index.html
@@ -390,9 +390,14 @@
                            headers: {'Content-Type': 'application/json'},
                            body: JSON.stringify(input.value)
                        }).then(response => {
-                           if (!response.ok) {
-                               response.text().then(body => {
-                                   alert('Status: ' + response.status + '\nBody: ' + body);
+                           if(!response.ok) {
+                               response.json().then(body => {
+                                   msg = `HTTP Status: ${response.status}\n`
+                                   msg += `mount: ${body["error"]["mount"]}\n`
+                                   msg += `key: ${body["error"]["key"]}\n`
+                                   msg += `value: ${body["error"]["value"]}\n`
+                                   msg += `msg: ${body["error"]["msg"]}`
+                                   alert(msg)
                                });
                            }
                        });
diff --git a/src/mergerfs_webui.cpp b/src/mergerfs_webui.cpp
index 5aa56812..37d74af2 100644
--- a/src/mergerfs_webui.cpp
+++ b/src/mergerfs_webui.cpp
@@ -306,15 +306,15 @@ _generate_error(const fs::path    &mount_,
   switch(err_)
     {
     case -EROFS:
-      rv["message"] = fmt::format("'{}' is readonly",key_);
+      rv["msg"] = fmt::format("'{}' is read only",key_);
       break;
     case -EINVAL:
-      rv["message"] = fmt::format("value '{}' is not valid for '{}'",
+      rv["msg"] = fmt::format("value '{}' is not valid for '{}'",
                                   val_,
                                   key_);
       break;
     default:
-      rv["message"] = strerror(-err_);
+      rv["msg"] = strerror(-err_);
       break;
     }