JSON-LD Validator

JSON-LD is the script block search engines parse when deciding whether a page earns a rich result: the headline and author of an article, the price of a product, the steps of a recipe, the questions of an FAQ. One misplaced comma or a date in the wrong shape can make Google silently skip the whole block. This validator reads pasted markup in three layers: whether the JSON parses, with exact line and column of any break, whether the shape is sound with a valid context plus well-formed type and graph nodes, and whether types, properties and values match the vocabulary, down to dates, URLs, prices, currencies, ratings and integers.

Checks inside the verdict engine

• 🧾 JSON syntax pass pinpointing line and column instead of failing silently
• 🧩 Shape pass over context, type and graph structure, including nested and multi-node documents
• 📚 Vocabulary pass against a built-in subset of about seventy schema types, flagging missing required fields per type
• 🏷️ Unknown types and properties marked as warnings, never hard errors, since extensions are legal
• 🔢 Value-shape tests for ISO dates, addresses, prices, three-letter currencies, ratings, integers and arrays
• 🏷️ Detected-type chips plus error and warning counts, with a one-click sample Article for learning

Moments when validation pays for itself

• 📰 Before publishing an article, recipe or event page whose rich result you count on
• 🔧 After hand-editing generator output, when one renamed field can void the block

What the verdict cannot promise

• 📖 The built-in vocabulary is a practical subset of the full tree, so rare types surface as warnings to confirm elsewhere
• ✅ Green means well-formed and eligible, while Google alone decides whether a rich result shows

Your markup is checked on the spot in this browser tab and never transmitted anywhere, so drafts and client copy stay private by construction, which is the entire privacy story of this page.