TechnicalSEO Schema Markup Generator vs VitalSentinel Schema Validator

TechnicalSEO Schema Markup Generator is a free web tool for creating Schema.org structured data as JSON-LD markup. You choose the Schema.org markup type, then complete the required item properties and any additional properties provided by the generator. The resulting JSON-LD can be copied and pasted into an HTML page. The page links to Google’s Structured Data Testing Tool and Rich Results Test, giving you named destinations for checking the markup. It does not describe automatic publishing, so placing the generated code in a page remains a separate step. TechnicalSEO.com lists this generator among SEO tools covering areas such as crawling, rendering, mobile SEO, international SEO, local SEO, and SERP and ranking. The page also suggests Schema App for an end-to-end schema markup solution. Merkle launched TechnicalSEO.com in April 2015 as a resource for its SEOs, industry members, and clients. The generator runs on the web and has a free plan.

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.