Error Handling in NodeJS (Complete Guide) | Node Tutorial 

Same bro I was not able to clearly understand error handling.

@@mma-dost Hey bro can you suggest some sites or mentors you followed to learn node

thank you!

thank you!

I'm exporting the AppError class by doing: module.exports = AppError; then importing it by doing: const AppError = require("./AppError"); I have a video about Node JS module imports/exports if you want to learn more about how this works!

@@nikita-dev cheers. I emailed u too :P

Great question! The benefit is that all of your error handling code will be in one place -- the error handler middleware -- and it will reduce repetition. If you were to send the error response in your controllers (instead of passing the error on), you would have to write "res.status(400).send(msg)" every time. Once your routes become complex and there are multiple different checks, you would be repeating yourself a lot. It's much cleaner to just pass the error on to the error handler middleware, and then define the error response there (once).

thanks for asking the doubt bro I was also used to think why not just send res.json(error).status(400) like that.