NodeMCU configuration:-> 1. Go to File -> Preferences, In preferences, put below URL in additional board manager URL column: http://arduino.esp8266.com/stable/package_esp8266com_index.json 2. Go to Tools -> Board -> Board manager, Search "ESP8266 community". and install it. 3. After installation, click OK and Go to Tools-> Board and select your board, that is : NodeMCU 1.0 (ESP-12E module). That's it, your NodeMCU board can be coded with Arduino IDE.