How To Retrieve Information About Error When Shopify Throws 404

Sometimes my dev server throws a 404 and I believe this is connected to my index.json, like also described here. 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 index.json related error leading to a 404 page from the local dev server?