Does an API function exist that enables a website URL to be used for querying the Wikipedia API?

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Yes, the Wikipedia API provides an endpoint for querying a page by its URL. The endpoint is called "action=parse" and accepts the "page" parameter with the URL-encoded name of the page as its value.

For example, to query the Wikipedia page for "Washington Monument" using its URL, you can use the following API request:

https://en.wikipedia.org/w/api.php?acti…

This will return a JSON object with the parsed content of the page, including its title, sections, and HTML content.