how can I generate video_device_id and last_video_device_id

[Sirarpi__m]

hello , I need to modify exported json from OBS, with each users webcams data, in json they called video_device_id and last_video_device_id .
I am using js api navigator.mediaDevices.enumerateDevices(), but its not the same, so wondering what is the logic to genarate those ids?