JSON-LD Generator vs VitalSentinel Schema Validator

JSON-LD Generator is a free web tool that creates structured data markup from fields users fill in, with generated JSON-LD shown in real time. It covers 17 schema types, including Article, Breadcrumb, Course, Event, FAQ, HowTo, Local Business, Organization, Product, Recipe, Review, Video, WebSite and WebPage. Product fields include offers, ratings and reviews; Local Business offers more than 100 subtypes, with examples such as Restaurant, Hotel and Dentist. The tool displays live checks for required fields and produces JSON using JSON.stringify, which the site describes as strictly valid JSON. Users can copy the generated code and open Google’s Rich Results Test, or follow a shortcut to the schema.org Validator. The form state is preserved between visits. A companion address-to-latitude-and-longitude tool is available for Local Business or Organization data. The generator runs on the web and requires JavaScript. Its creator, Patrick Coombe, says the site launched in 2017 as a reference for web developers and SEO practitioners learning about JSON-LD.

VitalSentinel Schema Validator checks structured data on a page URL and separates missing, recommended and broken information. It examines JSON-LD blocks individually, including nested entities and entities within an @graph. For broken blocks, it identifies line and column and names common causes such as trailing commas, curly quotes and HTML entities. Its property checks distinguish Google-required from recommended fields for Article, Product, FAQPage, Recipe, Event, BreadcrumbList, LocalBusiness and Organization; other listed types are not graded. It also flags non-absolute image URLs, dates outside ISO format and prices containing a currency symbol. The free checker reads server-sent HTML, so it cannot see JSON-LD inserted by JavaScript. It reports microdata and RDFa when present but does not grade them. A valid result does not guarantee a Google rich result, and the tool recommends Google's Rich Results Test for rendered pages and eligibility checks. It is available on web and via API. The plan list includes a free plan and Starter at $39 a month.