Dynamic url segments with ExpressJS

February 11, 2023

When I needed to add a dynamic segment to the URL, the first thing that came to mind was to try the following:

app.get('/one/*/two/*/three', (req, res, next) => {
    // req.params as any)[0] - first dynamic segment
    // req.params as any)[1] - second dynamic segment
});

Turns out, the code above works perfectly. What confuses me, however, I cannot find it anywhere in the official documentation, and any answer here about dynamic segments with ExpressJS suggests different things, none of them suggest use of asterisks.

Am I doing something wrong here? Or what am I missing?

>Solution :

From the official documentation about Routing:

Route paths

Route paths, in combination with a request method, define the
endpoints at which requests can be made. Route paths can be strings,
string patterns, or regular expressions.

The characters ?, +, *, and () are subsets of their regular expression
counterparts. The hyphen (-) and the dot (.) are interpreted literally
by string-based paths.