What are some common errors in Express.js and how can I fix them?

What are some common errors I might encounter while using Express.js?

Some common errors in Express.js include 'Cannot GET /route', 'Middleware not found', and 'Unhandled promise rejection'. Would you like to know how to fix any specific error?

Yes, what does 'Cannot GET /route' mean?

The 'Cannot GET /route' error means that the server cannot find the route you are trying to access. This usually happens if the route is not defined in your Express app.

How can I fix that?

To fix it, ensure that you have defined the route in your Express app using app.get('/route', handlerFunction). Also, check that the URL you are accessing matches the defined route.

What about 'Unhandled promise rejection'? How do I handle that?

'Unhandled promise rejection' occurs when a promise is rejected but there is no .catch() to handle the error. To fix it, always add a .catch() method to your promises or use async/await with try/catch blocks.