BEGIN:VCARD VERSION:4.0 FN:John Doe TEL;TYPE=work:+1234567890 EMAIL;TYPE=home:john@example.com END:VCARD
file containing 500 contacts, while others require 500 individual files. If your import fails, try splitting the file. custom Python script tailored to a specific JSON structure you already have? json to vcf converter
For educational purposes, here is a manual method. This is only feasible for 1-5 contacts. BEGIN:VCARD VERSION:4