Google gives site owners a free tool for tests. Both the code snippet or maybe the corresponding URL might be entered from the tool. The test supplies complete errors reporting and also exhibits what the result would appear like in the SERP. You’ll also see structured info called schema markup. https://addons.prestashop.com/es/seo-posicionamiento-buscadores/31857-google-rich-snippets-automatico-json-ld-opengraph-seo.html