express.js路由中的参数类型

Question

In express.js, if I have this route in my server side

router.get('/ad/:id', (req, res) => {

    const { id } = req.params

    Ad.getAd(id, (err, resp) => {
        if(err){
            return handleError('Failed to load an ad', res)
        }

        res.json({
            success: true,
            result: resp
        })
    })
})

and it worked fine I want to load a detail ad like example.com/ad/123 where id is 123. But I can't do example.com/ad/create anymore, any way to check the type of the param?

Answer 1

You can create separate route for it. Place before /ad/:id route, because it's catching all requests like /ad/* .

router.get('/ad/create', (req, res) => { /* some work */ })
router.get('/ad/:id', (req, res) => { /* some work */ })

---

Since you mentioned you are building a SPA, you must redirect all GET requests to react-router:

app.get("*", function (req, res) {
    res.sendFile(__dirname + "/path/to/index.html")
})

Also you can prepend api to all back-end endpoints to prevent ambiguity.

router.get('/api/ad/create', (req, res) => { /* some work */ })
router.get('/api/ad/:id', (req, res) => { /* some work */ })

Answer 2

router.get('/ad/:id', (req, res,next) => {
  const { id } = req.params
  if(! parseInt(id,10)){
     return next();//skip this route if not a number
  }
  //its a number
});