Express: Double slash before Router (router//route)

[checnev]

Hello, when i assign a router to the route, then there is access to routes with a double slash at the beginning.

example:

const express = require('express');
const app = express();
const port = 3000;

const router = express.Router({ strict: true }); // i've tried without strict mode
router.get('/test', (req, res) => {
  res.send('test');
});

app.use('/user', router);

app.listen(port, () => console.log(`app listening on port ${port}!`))

The router is supposed to run on the /user/test route, but the /user//test also works.

Environment:

"node": 14.3.0
"express": 4.17.1

[varmagtm]

Consecutive multiple path separators (the forward slash, in your case) in the URLs do not have any significance in the modern-day operating systems. But it is advised not to use like so.

Please refer to the Stackoverflow question here - https://stackoverflow.com/questions/10161177/url-with-multiple-forward-slashes-does-it-break-anything.

[checnev]

Consecutive multiple path separators (the forward slash, in your case) in the URLs do not have any significance in the modern-day operating systems. But it is advised not to use like so.

Please refer to the Stackoverflow question here - https://stackoverflow.com/questions/10161177/url-with-multiple-forward-slashes-does-it-break-anything.

yes, but it's not expected behavior, I'm interested in how to disallow double slashes

[rodion-arr]

@checnev usually this situation is not good for SEO purposes, I assume it's possible to write a middleware to detect this case and return 301 redirect to correct URI.

[RahulBansal123]

Consecutive multiple path separators (the forward slash, in your case) in the URLs do not have any significance in the modern-day operating systems. But it is advised not to use like so.
Please refer to the Stackoverflow question here - https://stackoverflow.com/questions/10161177/url-with-multiple-forward-slashes-does-it-break-anything.

yes, but it's not expected behavior, I'm interested in how to disallow double slashes

But is it is advised to handle it by writing a middleware as double slashes may cause problems while caching.

[rodion-arr]

I'm closing this as I truly believe in case this behaviour causes issues - it can be easily handled on middleware level. Please feel free to reopen in case I'm mistaken and we will try to raise it further to maintainers.