http://arduino.esp8266.com/stable/package_esp8266com_index.json file signature verification failed. File ignored.

[nkenna]

Everything about ESP8266 and NodeMCU just disappeared from my Arduino IDE. This error turns up when I try to access the Board manager:

http://arduino.esp8266.com/stable/package_esp8266com_index.json file signature verification failed. File ignored.

[electrical-pro]

@nkenna, My works fine... I think the problem on your side.

Try reinstalling Arduino IDE

[devyte]

Same here. Closing as can't reproduce.