如何始终将某个路径参数替换为 node.js 中的另一个值？

Question

My code example:

router.get('/name/:name/height', (req,res) => {
    ...
}

router.get('/name/:name/weight', (req,res) => {
    ...
}

router.get('/age/:age/height', (req,res) => {
    ...
}

router.get('/age/:age/weight', (req,res) => {
    ...
}

Here, when name comes as foo , I want to replace it to bar because foo is an alias of bar .

But inserting if-replace codes into all the blocks repeatedly doesn't look good.

Is there any other option to implement this??

---

I tried with:

router.use('/name/:name', (req, res, next) => {
    let name = req.params.name
    if (name === 'foo') {
        console.log("HHHHHHHHHHHHHHHHHHH")
        req.params.name = 'bar'
    }
    next()
    }
)

That HHH... log is printed, but the req.params.name doesn't seem to be updated.

Answer 1

If foo is indeed an alias for bar , I'd suggest you respond with a 301 Redirect response for the foo endpoint with something like this:

router.get('/name/foo/:path', (req, res) => {
  res.redirect(301, '/name/bar/' + req.path);
});

Answer 2

Wrap these if-replace codes into a middleware myCustomMiddleware then put that middleware in any router you need:

const myCustomMiddleware = (req, res, next) => {
    let name = req.params.name;
    if (name === 'foo') {
        req.params.name = 'bar';
    }
    next();
};

router.get('/name/:name/height', myCustomMiddleware, (req,res) => {
    ...
});

router.get('/name/:name/weight', myCustomMiddleware, (req,res) => {
    ...
});

router.get('/age/:age/height', (req,res) => {
    ...
});

router.get('/age/:age/weight', (req,res) => {
    ...
});

Try on repl.it