diff --git a/.changeset/shiny-radios-deliver.md b/.changeset/shiny-radios-deliver.md
new file mode 100644
index 0000000000..3a00a6acc0
--- /dev/null
+++ b/.changeset/shiny-radios-deliver.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder': patch
+---
+
+Encode the `formData` in the `queryString` using `JSON.stringify` to keep the types in the decoded value
diff --git a/plugins/scaffolder/src/components/TaskPage/TaskPage.tsx b/plugins/scaffolder/src/components/TaskPage/TaskPage.tsx
index 4c28caad1b..2f49f40643 100644
--- a/plugins/scaffolder/src/components/TaskPage/TaskPage.tsx
+++ b/plugins/scaffolder/src/components/TaskPage/TaskPage.tsx
@@ -302,7 +302,9 @@ export const TaskPage = ({ loadingText }: TaskPageProps) => {
 
     navigate(
       generatePath(
-        `${rootLink()}/templates/:templateName?${qs.stringify({ formData })}`,
+        `${rootLink()}/templates/:templateName?${qs.stringify({
+          formData: JSON.stringify(formData),
+        })}`,
         {
           templateName: taskStream.task!.spec.metadata!.name,
         },
diff --git a/plugins/scaffolder/src/components/TemplatePage/TemplatePage.tsx b/plugins/scaffolder/src/components/TemplatePage/TemplatePage.tsx
index 852ae3d81c..d30c292053 100644
--- a/plugins/scaffolder/src/components/TemplatePage/TemplatePage.tsx
+++ b/plugins/scaffolder/src/components/TemplatePage/TemplatePage.tsx
@@ -128,7 +128,11 @@ export const TemplatePage = ({
       ignoreQueryPrefix: true,
     });
 
-    return query.formData ?? {};
+    try {
+      return JSON.parse(query.formData as string);
+    } catch (e) {
+      return query.formData ?? {};
+    }
   });
   const handleFormReset = () => setFormState({});
   const handleChange = useCallback(