With a simple http server in node.js, how to find out why it's crashed? -

i running basic http server serve static files in node.js express:

var setting = require('../setting')  var express = require('express'), app = express(), port = setting.http.port;  app.use(express.static(__dirname + '/' + setting.http.static_dir)); app.listen(port); 

i know can use forever restart server if it's dead reason. but, there way log when server crashed can know reason why it's crashed , when it's crashed?

with forever:

forever -o out.log -e err.log my-script.js 

see this answer more details.

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if want log express server errors, use error handler generated express cli tool:

server.on('error', onerror);  /**  * event listener http server "error" event.  */  function onerror(error) {   if (error.syscall !== 'listen') {     throw error;   }    var bind = typeof port === 'string'     ? 'pipe ' + port     : 'port ' + port;    // handle specific listen errors friendly messages   switch (error.code) {     case 'eacces':       console.error(bind + ' requires elevated privileges');       process.exit(1);       break;     case 'eaddrinuse':       console.error(bind + ' in use');       process.exit(1);       break;     default:       throw error;   } } 

where server instance created running http.createserver(app).

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if want log callback errors, have this:

brokenfunction(function(err) {   if(err) return errorhandler(err);   //... });  function errorhandler(err) {   //do error printing console or writing file.   console.log(err); } 

where brokenfunction function returns error callback , errorhandler function performs actions want occur on error.