Blynk using Arduino Mega (microcontroller) and esp8266 (wifi module): Blynk.begin not initializing

[PeteKnight]

@leleleemon

Im using MEga as my controller and esp8266 nodemcu as WiFi

Use of a NodeMCU as a WiFi modem is unusual, but not impossible.
The main thing ids to ensure that it’s running AT firmware. A fresh NodeMCU may be loaded with AT firmware from the factory, but if you’ve ever uploaded a sketch to it then the AT firmware will have been overwritten.

Most people use an ESP-01 rather than a NodeMCU, but the basic principles are the same.

I’d start by considering using an ESP32 instead of the Mega.

If that won’t work for you then read this…

Understanding hardware and software serial ports

I’m still seeing frequent posts, mostly from new members of the forum, who are confused about how to add WiFi or Bluetooth connectivity to devices like the Arduino Uno, Nano or Mega, or from people who are trying to use serial communication with some other type of peripheral. I thought I’d try to put together some guidance on how to do this properly. First things first though – if you’re using a device such as an Uno, Nano or Mega that doesn’t have built-in internet connectivity then you shoul…

You could also consider Blynk.NCP with your Mega/NodeMCU.

In addition, your code is very badly written and your void loop isn’t compatible with Blynk.
You should read this…

Keep your void loop() clean | Blynk Documentation

Pete.