Turning on 1 LED by HTTP single command

I have a strip of approximately 500 RGB LEDs all working correctly.

What I’d like to do is switch one LED on with a command sent preferably via HTTP.

Is this doable using the stock WLED 0.13 version?

Macros and segments don’t seem to do what I need.

What about a preset with only the one LED you want?

You will need to look into JSON API.
Then just POST your JSON API command to WLED using HTTP.

This light led number 1 red

curl -d {“seg”:{“i”:[1,[255,0,0]]}} -H “Content-Type: application/json”
Also {“seg”:{“i”:[1,[255,0,0]]}} in a preset does the same thing