Question 53492 in Javascript Question posted in
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Is it possible in express JS to only accept one of two values in a path variable? – Javascript

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.

Tags:

2

Answers


  1. 0

    You could probably use a regular expression:

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

    See Path examples; Type: "Regular Expression"

    Here is a regex example in native JS to test out the route expression:

    const route =//api/platform/(?:windows|android)/;

const requests = [
  '/api/platform/windows',
  '/api/platform/android',
  '/api/platform/macos',
  '/api/platform/linux'
];

console.log(requests.filter(request => route.exec(request)));
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  2. 0

    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"}

    https://expressjs.com/en/guide/routing.html

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