Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
Zenda is a Javascript runtime software which will allow you to execute the language as a backend and not on the client side, ZendaJS works directly with it V8 JavaScript engine developed by Google, it is likely that Zenda performs processes faster than NodeJS and Deno , learn and have fun!