diff --git a/src/plugins/editor/editor-plugins/json-to-yaml.js b/src/plugins/editor/editor-plugins/json-to-yaml.js
index dd371a33c74..0219e235835 100644
--- a/src/plugins/editor/editor-plugins/json-to-yaml.js
+++ b/src/plugins/editor/editor-plugins/json-to-yaml.js
@@ -36,7 +36,7 @@ export default function(editor) {
 
 function isJSON (str){
   // basic test: "does this look like JSON?"
-  let regex = /^ *[{\[]/
+  let regex = /^[ \r\n\t]*[{\[]/
 
   return regex.test(str)