Verify the markup that you have added to your pages with Markup Validator.

Add structured data in JSON-LD format to your Drupal website.

Test your publicly accessible page to see which rich results can be generated by the structured data it contains.

An implementation of RDFa processing in the browser.

The GS1 Web Markup tool makes it easy for you to add structured data about products to your own website.

A web-based tool to view, edit, format and validate JSON.

A web-based JSON-LD viewer and debugger.

Easily create, copy, and paste the right JSON for adding structured markup to any page.

The Microdata Generator allows you to input basic information and have that info converted into the standard schema.org markup structure.

The Microdata Generator makes creating local SEO schema markup easy.

Detects and presents the microdata embedded in a given page.

The OpenLink Structured Data Sniffer (OSDS) is a browser extension for Google Chrome, Mozilla Firefox, and Opera that unveils metadata oriented structured data embedded within HTML documents.

A multi-format conversion tool for structured markup. It provides translations between data formats ranging from RDF/XML to RDFa or Microdata.

A real-time RDFa 1.1 editor, data visualizer and debugger.

Schema App empowers the digital marketer to own their schema markup strategy through to implementation without ever writing code.

Schema Generator

Schema Markup Viewer allows you to test schema markup with a URL or JSON-LD code and also compare Schema between URLS (E.G you and a competitor)

This tool has the ability to extract JSON-LD, RDFa, and Microdata markup, display a summary of the extracted structured data and identify syntax mistakes in the markup.

WordPress plugin for adding schema.org structured data markup in recommended JSON-LD format automatically.

A Google Chrome extension that shows you a structure written with HTML Microdata.

See what structured data your page contains.

The Structured Data Markup Helper helps you mark up elements on your web page so that Google can understand the data on the page.

This extension will check structured data / rich snippets on a webpage regardless of whether it is online, on an intranet or behind a passworded page.

This tool takes structured data of a page and displays it as floating linked items.

Extracting Structured Data from the Common Crawl.

WordLift, without requiring any technical skills, helps you produce richer content and organize it around your audience.

WordPress plugin for Schema JSON-LD markup and Google SEO Rich Results for Articles, Events, Local Business, Products, Recipes, Reviews and many more.

Validates microdata, schema.org, microformats, Open Graph, RDFa and other structured data.