How do I validate route parameters in my web application?

How do I validate route parameters in my web application?

You can validate route parameters by using middleware functions in your web framework. What framework are you using?

I'm using Express.js. Can you give me an example?

Sure! In Express.js, you can use a middleware function to check if the parameters meet your criteria. For example:

app.get('/user/:id', (req, res, next) => {
  const id = req.params.id;
  if (!/^[0-9]+$/.test(id)) {
    return res.status(400).send('Invalid ID format');
  }
  next();
});

What if I want to validate multiple parameters?

You can chain multiple validation checks in the same middleware or create separate middleware for each parameter. Would you like to see an example of that?