nodejs: parsing chunks of json - json

Question

I created a test server that sends chunks of stringified JSON. When I connect to the server it sends invalid JSON and for the life of me I can't figure out why. The output adds an extra double quotation mark.
Server code:
const net = require('net'),
server = net.createServer(function(connection) {
console.log('subscriber connected.');
// send first chunk immediately
connection.write('{"type":"changed","file":"targ"');
let timer = setTimeout(function() {
connection.write('et.txt","timestamp":1358175758495}' + '\n');
connection.end();
}, 1000);
connection.on('end', function() {
clearTimeout(timer);
console.log('subscriber disconnected');
});
});
server.listen(5432, function() {
console.log('test server listening for subs...')
});
ldj.js
'use strict';
const
events = require('events'),
util = require('util'),
// client constructor
LDJClient = function(stream) {
events.EventEmitter.call(this);
let self = this;
let buffer = '';
stream.on('data', function(data) {
buffer += data;
console.log(buffer)
let boundary = buffer.indexOf('\n');
while(boundary !== -1) {
let input = buffer.substr(0, boundary);
buffer = buffer.substr(boundary + 1);
//self.emit('message', JSON.parse(input));
boundary = buffer.indexOf('\n');
}
});
};
util.inherits(LDJClient, events.EventEmitter);
// expose module methods
exports.LDJClient = LDJClient;
exports.connect = function(stream) {
return new LDJClient(stream);
};
Output:
{"type":"changed","file":"targ"
{"type":"changed","file":"targ"et.txt","timestamp":1358175758495}
That extra " should not be in "target.txt" value. Any ideas?
TIA

Answer 1

rathern than splitting string manualy try to get whole string and split it to chunks and then send it:
var data = '{"type":"changed","file":"target.txt","timestamp":1358175758495}';
var chunks = data.match(/.{1,10}/g); // 10 symbol chunks
for(var i = 0; i < chunks.length; i++) {
var chunk = chunks[i];
setTimeout(function() {
if(connection) {
connection.write(chunk+'\n');
if(i + 1 == chunks.length) {
connection.end();
}
}
}, i*1000);
}
connection.on('end', function() {
console.log('subscriber disconnected');
});