Nodejs - data transfer between server and client - node.js

Question

I was given a task to send JSON string from client to server and from server to client, whenever there is a new record found to send.
I decided to build TCP connection(suggest me if there is any other better way in Node.js) between server and client to transfer data.
The problem is, I was supposed to use a delimiter to separate JSON strings one from another. I am afraid what if the json string contains the delimiter string inside the object. I am looking for a better way to separate two JSON strings.
Below is my code. Please help me.
Client
var net = require('net')
, client = new net.Socket();
var chunk = ''
, dlim_index = -1
, delimit = '~~';
client.connect(config.Port, config.IpAddress, function () {
console.log('Server Connected');
client.write('CLIENTID:' + process.argv[2]);
client.write(delimit);
});
client.on('data', function (data) {
var recvData = data.toString().trim();
chunk += recvData;
dlim_index = chunk.indexOf(recvData);
console.log(data);
while (dlim_index > -1) {
var useData = chunk.substring(0, dlim_index);
if (useData == 'SUCCESS') {
controller.listenOutQueue(function (dataToSend) {
var object = JSON.parse(dataToSend);
client.write(dataToSend);
client.write(delimit);
});
}
else {
var record = JSON.parse(useData);
controller.insertIntoQueue(record, function (status) {
});
}
chunk = chunk.substring(dlim_index + 2);
dlim_index = chunk.indexOf(delimit);
}
});
client.on('close', function () {
console.log('Connection closed');
});
client.setTimeout(50000, function () {
//client.destroy();
});
Server
var net = require('net')
, server = net.createServer()
, delimit = '~~'
, clients = [];
controller.listenOutQueue(function (dataToSend) {
client.write(dataToSend);
client.write(delimit);
});
server.on('connection', function (socket) {
var chunk = '';
var dlim_index = -1;
socket.on('data', function (data) {
var recvData = data.toString().trim();
chunk += recvData;
dlim_index = chunk.indexOf(delimit);
while (dlim_index > -1) {
var useData = chunk.substring(0, dlim_index);
if (useData.substring(0, 9) == 'CLIENTID:') {
socket.clientid = useData.replace('CLIENTID:', '');
console.log('Client Id: ' + socket.clientid);
clients.push(socket);
var successMessage = "SUCCESS";
socket.write(successMessage);
socket.write(delimit);
}
else {
controller.insertIntoQueue(JSON.parse(useData), function (status) {
});
}
chunk = chunk.substring(dlim_index + 2);
dlim_index = chunk.indexOf(delimit);
}
});
socket.on('end', function () {
console.log('Connection Closed (' + socket.clientid + ')');
});
socket.on('error', function (err) {
console.log('SOCKET ERROR:', err);
});
});
server.listen(config.Port, config.IpAddress);