javascript - How to wait on the data from net.socket to be fully submitted -

i need receive big json string windows application. can't seem figure out how need wait on data transmitted before close connection.

i've read need wait on callback, i've looked through documentation , can't wrap head around it.

i'm new node.js , javascript programming in general bear me here.

client.on('data', function(data) {      completedata = data;     //close connection     client.end(); }); client.on('end', function() {     //parse data after receiving full json     responsedata = json.parse(completedata);     console.log('received data \r\n' + json.stringify(responsedata,   null, 4));     client.destroy();     console.log('connection closed');     next(); }); 

edit:

i've tried it's still closes before data.

client.on('data', function (data) {  if (newlineregex.test(data)) {     console.log('received: ' + data);     responsedata = json.parse(data);     console.log('received data \r\n' + json.stringify(responsedata, null, 4));     client.end(); } 

});

edit: adding full code, must missing something. if add doesn't work code executes json.parse fast, if doesn't parse @ (doesn't end in client.on('end'))

var keystone = require('keystone'); var serverconnection = require('server-connection') var newlineregex = require('newline-regex');  exports = module.exports = function (req, res) {  var view = new keystone.view(req, res); var locals = res.locals;  // locals.section used set selected // item in header navigation. locals.section = 'server'; locals.responsedata = new object; var completedata;  var net = require('net'); var client = new net.socket('null', true); client.connect(3333, '192.168.56.1', function (err) {     console.log('connected');     //string test     var string = '{"method":"getserialiseddeviceinfo","params":[],"id":1}\r\n';     client.write(string); }); client.on('data', function (data) {     completedata = completedata + data;     console.log(completedata);     //doesn't work     //if (newlineregex.test(completedata)) {         //client.end();     //} });  client.on('end', function () {     //parse data after receiving full json     responsedata = json.parse(completedata);     console.log('received data \r\n' + json.stringify(responsedata, null, 4));     client.end();     console.log('connection closed');     view.render('server'); });  }; 

there needs kind of established protocol determine end of "message" because tcp connections streams. there no built-in "message" boundaries have udp packets example.

in case of json, 1 popular , easy solution problem use newline-delimited json strings. way, need continually buffer data until see newline, know you've reached end of json message , can safely parse @ point.