How do you catch and handle errors in nodejs?

Question

Node.js

For example, I connect several of my modules to the main server file. These modules encapsulate some set of functions. Other own modules are also connected to those modules. And here, for example, an error occurs in the files of the third level. How to catch her? In the file in which it happened? Or will it return to the place where the function was called in the main server file and can be processed by a special middleware?

//server.js
var api = require('first');
api.run() <-- здесь

//first.js
var second = require('second');

module.exports = {
     run: function() { second.solve() }
}

//second.js

module.exports = {
    solve: function(){ return 1/0; }   <-- или здесь
}

And if, of course, callbacks are used, how in this case?

Answer 1

The file doesn't matter. Synchronous code - try-catch , asynchronous - domains (for example, in middleware) or Promise . Anything not caught is an uncaughtException .