Review on 📶 Aideepen ESP8266 Serial Wi-Fi Wireless ESP-01 Adapter Module 3.3V 5V Compatible Pack of 3 for Arduino by Jim Bethea

This is a must if you want to connect your ESP-01 directly to the programmer and upload sketch after sketch to work on minor revisions/bug fixes with just the ESP-01. I just soldered some wires for GND, GPIO00 and GPIO02 and also added a momentary switch connected to GND and GPIO00 to put it in programming mode. IMHO just missing those pinouts and a programming mode switch, then this would be perfect for debugging or even as a simple standalone backbone for the ESP-01.