Raspberry Pi Wifi Config update function

file update config function

 console.log("Updating Wifi to SSD: " + SSID);
    
    var data = fs.readFileSync('/etc/wpa_supplicant/wpa_supplicant.conf', 'utf8');
    var result = data.replace(/ssid="(.*)"/g, 'ssid="'+ SSID + '"');
    var finalResult = result.replace(/psk="(.*)"/g, 'psk="'+ Password + '"');
    
        console.log("Will print: \n" + finalResult); //this prints out correctly, finalResult holds what I want it ot
        
//need to fix writing to file (only writes like a piece of it)
  fs.writeFile('/etc/wpa_supplicant/wpa_supplicant.conf', finalResult, 'utf8', function (err) {
     if (err) return console.log(err);
    console.log("about to reboot network config");
    //rebootNetwork();
  });