Documentation of the Programmatic Interface (API) to The W3C Markup Validation Service (original) (raw)

Markup Validator Web Service API

For programmatic checking of modern HTML documents, use the API provided by theW3C HTML Checker. To do that, callhttps://validator.w3.org/nu/ or the URL for another instance of the W3C HTML Checker, and consult the following documentation:

• W3C HTML Checker GET interface
• W3C HTML Checker POST interface
• W3C HTML Checker parameters
• W3C HTML Checker out=json format
• W3C HTML Checker out=xml format
• W3C HTML Checker out=gnu format

Also available is historical documentation about theobsolete SOAP 1.2 API for the Markup Validator (which you should no longer use).