get url after “#” in express.js middleware request

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No. The part of the URL starting with the # symbol is never sent to the server.

The # symbol in an URL is to introduce the fragment identifier. This is used to link to a specific part of the page. If a browser loads /#some/url, it will effectively load /, and skip to the HTML element with id="some/url" (if present). The fragment identifier is only relevant to the browser, so it is not sent with the HTTP request.

What you however can do, is using client side Javascript to read out the value of window.location.hash and send it to the server using an XMLHttpRequest. (See other Stack Overflow post.)

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