How to add JSON-LD structured data to Astro and Docusaurus sites

Structured data tells search engines what a page represents, such as an article with an author and date, or the organization behind a site, and Google recommends JSON-LD as the format for it. Developers should first check whether their framework already emits types like BreadcrumbList or BlogPosting, to avoid duplicate blocks. Hand-written JSON-LD often breaks on syntax errors, relative URLs, missing @context or @type fields, dates lacking time zones, or markup describing content not visible on the page. The article recommends auditing built HTML for missing blocks, testing templates with Google's Rich Results Test and the Schema Markup Validator, and monitoring Search Console after deployment. For large sites, it suggests an automated build step that generates valid, page-accurate markup.