What does “res.render” do, and what does the html file look like?

Question

What does res.render do, and what does the html file look like?

My end goal is to load arbitrary comma-separated-values fr

Answer 1

Renders a view and sends the rendered HTML string to the client.

res.render('index');

Or

res.render('index', function(err, html) {
  if(err) {...}
  res.send(html);
});

DOCS HERE: https://expressjs.com/en/api.html#res.render