How do I handle parameters and queries in Express.js?

How do I handle parameters and queries in Express.js?

In Express.js, you can handle URL parameters using req.params and query strings with req.query. For example, if you have a route like /users/:id, you can access the id parameter using req.params.id.

Can you give me an example of using both parameters and queries?

Sure! Here's an example: app.get('/users/:id', (req, res) => { const userId = req.params.id; const filter = req.query.filter; // Use userId and filter here }); This route captures the user ID and any query filters.

What if I want to validate the parameters?

You can use middleware for validation. Libraries like express-validator can help you validate and sanitize parameters and queries before they reach your route handler.

Are there any best practices for using parameters and queries?

Yes! Always validate and sanitize inputs, use meaningful parameter names, and keep your routes organized for better readability.