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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
Hi! There are two types of RFID sensor that have some example code to make them work with Espruino right now:
http://www.espruino.com/MFRC522
http://www.espruino.com/PN532
They only read the card's unique ID, but if needed let me know and I could extend them to read full RFID data.
One is SPI, and one is I2C (requiring less wires) - and on Puck.js any peripheral can be on any pin, so you literally just have to wire it up to any free IO pins and you're sorted.
For power - yes, you can power Puck.js from its 3V pin. You just need a voltage between around 2V and 3.6v. Sadly that's not quite high enough to allow you to run it from a LiPo battery (but then the RFID sensor wouldn't have liked that anyway), so you'll probably want to use some kind of 3.3v voltage regulator/power supply - they're easy enough to get hold of but ask if you need some advice there.
In fact, realistically while the voltage to an RFID reader is correct, I think you'll struggle getting enough power out of the CR2032 battery in the puck to power the reader, so you'll probably want an external power supply anyway.
For the Phone->webserver thing, the simplest method would be to do something using Web Bluetooth: https://www.espruino.com/Puck.js+Web+Bluetooth
However as another simple, no-setup multiplatform option you could actually make Puck.js act like a Keyboard (https://www.espruino.com/Puck.js+Keyboard) and 'type' the data it received.