How to serve static files on a dynamic route using Node Express?

To serve static files on a dynamic route using Node Express, we call the sendFile method.

For instance, we write

app.get("/user/:uid/files/*", (req, res) => {
  const uid = req.params.uid;
  const path = req.params[0] ? req.params[0] : "index.html";
  res.sendFile(path, { root: "./public" });
});

to call app.get to add a get route that gets the URL parameters from req.params.

And we use that to create the path for the file.

Then we call res.sendFile to send the file at the path within the root folder as the response.