How do I handle missing route parameters in my API?

How do I handle missing route parameters in my API?

You can handle missing route parameters by checking if they exist before processing the request. If they are missing, return a 400 Bad Request response.

What if I want to provide default values for those parameters?

You can set default values in your route handler. If a parameter is missing, use the default value instead.

Can you show me an example in Express.js?

Sure! In Express.js, you can do something like this: app.get('/user/:id?', (req, res) => { const id = req.params.id || 'defaultId'; ... });.

What about validation for these parameters?

You can use middleware like Joi or express-validator to validate the parameters and ensure they meet your requirements.