How to send an email for every error that occurs in Node.js?

Question

Let's say my node.js. application is running If there is an error (I mean ALL errors. Not only a web error. If it goes to Err out, it is counted), how can I call a function to send an email to me?

Basically, before I want him to write err.out, I want an email to be sent to me.

I am using node.js and express.

Edit: I know how to send an email. The question I want to know is how to catch the error . Do you know how out.log log appears on error? Well, right now, I tail -f out.log, watching for errors. I can’t sit at home all day doing this. I want errors to be emailed to me anytime they appear in out.log.

I need all emails sent to me by email. (Not just Express errors). If it is registered, I want this error to be emailed.

Answer 1

You can replace the nodes with the global console.error () function with a single email:

console.error = function(msg) { // send email // ... // additionaly log process.stderr.write(msg); }; 

Then each call in each library made for console.error () will call your specific implementation, send mail;)

Answer 2

Look at nodejs clients and smtp servers

emailjs example

 var email = require("./path/to/emailjs/email"); var server = email.server.connect({ user: "username", password:"password", host: "smtp.gmail.com", ssl: true }); // send the message and get a callback with an error or details of the message that was sent server.send({ text: "i hope this works", from: "you < [e-mail] >", to: "someone < [e-mail] >, another < [e-mail] >", cc: "else < [e-mail] >", subject: "testing emailjs" }, function(err, message) { console.log(err || message); }); 

Answer 3

Since all log entries are stored in a limited number of log files, instead of trying to catch all the possible error events, why not just set up a file change monitor and send you new lines? Thus, you can also schedule intervals with summary log entries of the last hour / day / ..., which will be much easier to go through than opening individual letters.