How to add multiple optional route parameters in Node Express?

To add multiple optional route parameters in Node Express, we add question marks after the parameter placeholders.

For instance, we write

app.get("/articles/:year?/:month?/:day?", (req, res) => {
  const year = req.params.year;
  const month = req.params.month;
  const day = req.params.day;
  //...
});

to add a get route handler with the year, month and day route parameters made option with ?.

We get the route parameter values from the req.params object.