Is it possible in express JS to only accept one of two values in a path variable?


Let’s say I have this GET url in my REST service:

router.get('/api/platform/:type', async (req, res) => {
    // something

I only want the request if :type is "windows" or "android". are there any way to do this in the url definition?

I think I’ve seen something like this before:

router.get('/api/platform/:type{windows|android}', async (req, res) => {
    // something

Something like that but it doesn’t quite work for me.

>Solution :

You can append a regular expression in parentheses to a route parameter to validate its format:

router.get('/api/platform/:type(windows|android)', async (req, res) => {
    // something

To have more control over the exact string that can be matched by a route parameter, you can append a regular expression in parentheses (()):

Route path: /user/:userId(\d+)
Request URL: http://localhost:3000/user/42
req.params: {"userId": "42"}

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