EADDRINUSE means that the address you are trying to use port number which listen() tries to bind the server,

You need to check the listening event like this,



var http=require('http');

...

...

});



server.on('listening',function(){

    console.log(' server is running');

});

server.listen(80);


Other then, kill the existing process and can start your node.js. 

Run the below command to get the process id
 
# ps aux | grep node

# kill -9 PID