It is possible to extract information from a site and store it in your computer by using a web browser. You can extract information about a web page by using a browser and storing the information in your computer.
To extract data from websites, you must use a special program. These programs assist in gathering the data that you need from a website and organizing it for you to examine. You may be able to extract all sorts of data from websites with these programs, including URLs, domains, meta tags, links, and more.
This API provides JSON access to the technology information of a website which includes all technical information as found on detailed lookups and additional metadata where available.
You can check Get Tech From Website API for free here.