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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I'm afraid the nRF52 chip in these devices is itself just a passive NFC tag. It can't read other passive tags.
For that you need to wire up something like http://www.espruino.com/MFRC522 or http://www.espruino.com/PN532