It is not necessary to have two routes.
Simply add
(/*)?at the end of yourpathstring.For example,
app.get('/hello/world(/*)?' /* ... */)
Here is a fully working example, feel free to copy and paste this into a .js file to run with node, and play with it in a browser (or curl):
const app = require('express')()
// will be able to match all of the following
const test1 = 'http://localhost:3000/hello/world'
const test2 = 'http://localhost:3000/hello/world/'
const test3 = 'http://localhost:3000/hello/world/with/more/stuff'
// but fail at this one
const failTest = 'http://localhost:3000/foo/world'
app.get('/hello/world(/*)?', (req, res) => res.send(`
This will match at example endpoints: <br><br>
<pre><a href="${test1}">${test1}</a></pre>
<pre><a href="${test2}">${test2}</a></pre>
<pre><a href="${test3}">${test3}</a></pre>
<br><br> Will NOT match at: <pre><a href="${failTest}">${failTest}</a></pre>
`))
app.listen(3000, () => console.log('Check this out in a browser at http://localhost:3000/hello/world!'))