title: How To Retrieve Information About Error When Shopify Throws 404
body: <p>Sometimes my dev server throws a 404 and I believe this is connected to my <code>index.json</code>, like also described <a href="https://community.shopify.com/c/technical-q-a/shopify-admin-theme-preview-giving-404-not-found/td-p/1340443" rel="nofollow noreferrer">here</a>.  But the dev server doesn't output any errors in such a case (it only does when there is an error related to the JSON inside the section schemas).  Hence my question, is there any possibility to track down a <code>index.json</code> related error leading to a 404 page from the local dev server?</p>