check components data keys

src/helpers/json.js

+'use strict'
+
+module.exports = (context) => {
+  return JSON.stringify(context, null, 2)
+}

src/partials/page-versions.hbs

@@ -5,7 +5,7 @@
   <h2 class="title"><a href="{{{relativize ./url}}}">{{page.component.title}}</a></h2>
   <button class="version-menu-toggle" title="Show other versions of page">{{#if (or page.componentVersion.version (ne page.componentVersion.displayVersion 'default'))}}v{{page.componentVersion.displayVersion}}{{/if}}</button>
 
-  <!-- Version data: {{site.components}} -->
+  <!-- Version data: {{json site.components}} -->
   {{#with site.components.[0]}}
   <!-- Version data: {{versions}} -->
   <!-- Version data: {{./versions}} -->