How to save wifi credentials to keep the server after connecting the first time?

[IvanR3D]

Does anyones could share an example of how saving the credentials on the function:
void onImprovWiFiConnectedCb(const char *ssid, const char *password) { // Save ssid and password here server.begin(); blink_led(100, 3); }

I was trying an approach using the eeprom library but it doesn't work. I appreciate any advice or example for doing this. I am using the ESP8266.