can I power 2 led's with an esp8266 plugged into the USB port?

[Sunbelt57]

Can I power 2 LED's with the D1 plugged into the USB port only? I'd like to be able to program it while it's running the LED's. Another question: if I do have a separate power supply (5v to the 5v pin) or 3.3v to the 3.3v pin, can I still have it plugged into the USB port? Also, I tried searching for if I can power the chip with 5v input to the 5v pin and I'm getting different answers.

[MicroController]

Can I power 2 LED's with the D1 plugged into the USB port only? I'd like to be able to program it while it's running the LED's.

Yes you can, no problem.

if I do have a separate power supply (5v to the 5v pin) or 3.3v to the 3.3v pin, can I still have it plugged into the USB port?

According to "some" schematics there's a diode between USB 5V (Vbus) and the 5V pin, so 5V pin + USB should work. USB + 3.3V probably won't; it may happen to work (for some time), but it may also damage or destroy the D1 board (voltage regulator) and/or the power supply.

Also, I tried searching for if I can power the chip with 5v input to the 5v pin and I'm getting different answers.

Yes, power via the 5V pin should be perfectly fine.