Structured data in JSON-LD format is how a site explains itself to Google: organization, recipe, article, product, event. Without valid JSON-LD, your listing is a plain title and description; competitors with schema occupy 3-5x more SERP real estate via rich features.
Why this matters
Google translates JSON-LD into rich snippets: star ratings, recipe images, product prices, FAQ accordions, breadcrumb trails. Pages with rich snippets average 30-50% higher CTR than plain results - the difference can double organic traffic with no change to ranking.
JSON-LD errors are particularly dangerous because they fail silently. The code looks correct at a glance, but Google quietly drops it - no error message. Missing required fields, syntax mistakes, or invalid values cause silent rejection. You invest in schema and see nothing.
The most important schema types for WordPress:
- Organization - who runs the site. Logo, social profiles, contact info.
- WebSite - enables the sitelinks searchbox in branded SERPs.
- Article / BlogPosting - for posts. Date, author, image.
- Product - for e-commerce. Price, availability, rating.
- Recipe - for food blogs. Calories, time, ingredients.
- FAQPage - for Q&A pages.
- BreadcrumbList - shows breadcrumb trails in results.
How to detect
Google's official tool: https://search.google.com/test/rich-results - paste your URL and get a full report. It lists every schema found, supported types, warnings, and errors.
Complementary check: in Google Search Console > Enhancements there are dedicated reports per schema type (Articles, Products, FAQs) showing URLs with errors.
Third check: view source and search for application/ld+json. Copy the JSON into https://validator.schema.org/ - validates syntax and field values.
How to fix
The most common path is an SEO plugin. Each adds schemas automatically:
- Yoast SEO - emits Organization + WebSite + Article automatically. Premium adds Product, FAQ, How-to.
- Rank Math - 14 schema types out of the box. Includes Product, Recipe, SoftwareApplication.
- RankPlus - emits the foundational schemas automatically.
- Schema Pro - dedicated plugin for advanced schemas.
After installing the plugin, configure schema settings. In Yoast: SEO > Search Appearance > Content Types - assign a schema type per post type. In Rank Math: Schema > Settings - pick a default schema per post type.
For WooCommerce stores: confirm WooCommerce + your SEO plugin emit Product schema. Verify fields for price, availability, description, brand. If a review plugin like Yotpo or Judge.me is installed, the schema should include aggregateRating.
For recipes: install WP Recipe Maker or Tasty Recipes - both emit valid Recipe schema with nutrition, prepTime, and ingredients.
Common mistakes
First mistake: schema describing information not visible on the page. If FAQ schema exists but the page renders no FAQ to the user, Google flags it as spam and penalizes the site. Since 2023, Google enforces a "visible content" policy - schema must describe content the user actually sees.
Second mistake: duplicate schemas. If both your SEO plugin and your theme emit Article schema, Google receives two conflicting copies. Keep schema generation in one tool only.
Third mistake: missing required fields. Article schema requires headline, image, datePublished, author. Any one missing voids the schema. SEO plugins usually handle this, but verify in Rich Results Test.
Fourth mistake: combining microdata or RDFa with JSON-LD. Google recommends JSON-LD exclusively. Mixing formats triggers warnings and confusion.
Verifying the fix
Run Rich Results Test on the homepage, a single post, and a product page. Confirm zero Errors (which block rich results) and minimize Warnings. In Search Console > Enhancements, watch valid URLs climb over 4-6 weeks. Check Performance > Search Appearance for CTR improvement.