This technique utilize existing scraper script at github. It require you to join to target group first. Please keep in mind to not use personal number instead register your WhatsApp account with virtual number from SMS-Verification Service. Then you need to copy paste javascript code that will scrap your number and export it to csv format.
Why people want Scrape Number ? : Free Leads I guest but i don't know and not much care . It common that tier 2 to 3 country mostly using Instant messaging chat like WhatsApp as form of formal communication. Government official,NGO to religious fanatic cult using WhatsApp to communicate and do work.
