javascript - Node.js - Server crashes when started on startup, doesn't crash when manually started -

i running node.js , socket.io online chat. have created file in:

/etc/init/example.conf  

it has 2 lines:

start on startup exec forever start /var/www/example.com/html/server.js //location of server file. 

whenever start file upload in chat application, crashes instantly restarts.

whenever kill node process though, , start manually - works fine.

i can't logs or terminal when it's auto started - doesn't print me terminal.

i still new node.js , linux in general. node.js running on express + jade.

how determine specific cause?

i managed solve problem, after bit of searching around found out tail command.

my issue bit harder trace because node.js process started autostart when launched terminal , connected server, process running in background , wouldn't output (including exception messages).

anyway, solution worked me was:

i typed

ps aux | grep node //to find pid of node process 

then went following directory

cd /proc/[pid of running node service]/fd 

in fd directory there few objects can output if want attach , listen servers output including uncaught exceptions, need 1. so:

tail -f 1 

that way able cause website crash , see output.