Schema Builder for Structured Data is a free Chrome add-on developed by seoClarity. It allows users to easily generate validated json-ld structured data markup for any webpage, based on the schema.org specification. With this tool, web developers no longer have to learn each Schema type, worry about errors, or spend time figuring out which elements are required or recommended.

The plugin offers support for 20+ Schema types, including all Google supported markups. It automatically detects existing structured data and provides a point-and-click interface to populate schema fields. The intuitive UI guides users through the required, recommended, and optional elements for each schema, making it easy to generate the perfect JSON-LD structured data.

Additionally, the plugin includes a built-in Schema testing tool to validate the generated schema markup and identify any errors or warnings. It also offers an intuitive UI available in both English and Japanese.