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We have developed this file upload feature purely from a backend Express application perspective. However, supporting multipart/form-data encoding as part of a <input type="file"> isn't very complicated to implement on the frontend:

<form action="http://localhost:3000/api/login" method="post" enctype="multipart/form-data">
  <input type="file" name="cover">
  <button type="submit">Submit</button>
</form>

This sort of file upload support has existed in web browsers since the HTML 4 spec, so there is a lot of supplemental information available online about this topic.

If you are interested in learning more about the frontend aspect of this topic, check out the official W3 documentation for multipart/form-data: https://www.w3.org/TR/html401/interact/forms.html#h-17.13.4 ...