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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 there's no code in that module to handle reading/writing of data on the cards yet - just getting the ID.
I'm out of the office today but I'll see what I can do on Monday. If you can't wait until then or want do do it yourself you'll need to extend http://www.espruino.com/modules/MFRC522.js using the information in the MFRC522's datasheet.