Save output console.log to file

consolelog.js

// Function that will call your webserver
logToServer = function (consoleMsg) {
  // only do this if on device
  //   if (window.cordova) {
  let jsonTxt = customStringify(consoleMsg);
  var xmlHttp = new XMLHttpRequest();
  xmlHttp.open(
    "GET",
    "http://wsite.localhost/console2server.php?msg=" + jsonTxt,
    true
  ); //async
  xmlHttp.send(null);
  //   }
};

// Test if you receive this on the server

// intercept console logs
(function () {
  var oldLog = console.log;
  console.log = function (message) {
    // DO MESSAGE HERE.
    logToServer(message);
    oldLog.apply(console, arguments);
  };
})();

// intecept errors
if (window && !window.onerror) {
  window.onerror = function (errorMsg, url, lineNumber, column, errorObj) {
    logToServer(errorMsg);
    logToServer(errorObj);
    return false;
  };
}

// this is optional, but it avoids 'converting circular structure' errors
customStringify = function (inp) {
  return JSON.stringify(inp, function (key, value) {
    if (typeof value === "object" && value !== null) {
      if (cache.indexOf(value) !== -1) {
        // Circular reference found, discard key
        console.log("circular dep found!!");
        return;
      }
      // Store value in our collection
      cache.push(value);
    }
    return value;
  });
};




<?php
//allow CORS request
header('Access-Control-Allow-Origin: *');

$fp = fopen('/home/logs.log', 'a');

if(isset($_GET['msg'])) {
    //you can also log to a file or whatever, I just log to standard logs
    // error_log("[CONSOLE.LOG] ".json_decode($_GET['msg'], true), "/home/git/logs.log");
    fwrite($fp, "\n".json_decode($_GET['msg'], true));
}

fclose($fp);
?>