NFC vCard

Can you be a little more specific?

The documentation for the NFCTag module is available here:
https://www.espruino.com/NFCTag

I've tested the library with iOS13 (now also featuring write!!!) using a recently released App (not by me): https://apps.apple.com/ch/app/nfc-tools/id1252962749

iOS is a little more picky than Android so tuning some static data is required:

var data = new Uint8Array(16+872);
data.set("\x00\x00\xE1\x10\x6D\x00\x03\x00\xFE\x00", 0x0A);
var tag = require("NFCTag").create(data);