To fix broken routes, check your route definitions for typos and ensure they match the requests made. Verify that your route handler functions are properly defined and accessible.

Broken routes in a Node.js application can lead to frustrating experiences for users, often resulting from issues like typos, incorrect HTTP methods, or misconfigured middleware. To troubleshoot, start by reviewing your route definitions in the code. Ensure that the route paths match exactly what the frontend is sending in requests. A common issue is a mismatch in the expected HTTP method; for instance, using GET when a POST request is expected will result in route errors. Check your console for any error messages that indicate what went wrong, as they often provide clues about the issue. Also, ensure that the route handler functions are defined correctly and accessible in the scope where they are being used. If you are using middleware, ensure it is applied correctly and in the right order, as middleware can impact how routes behave. Lastly, utilize tools like Postman or curl to manually test your routes, making sure they respond as intended. By systematically checking each of these areas, you can identify and resolve issues related to broken routes in your application.