minecraft-pi allows you to control a Minecraft: Pi Edition server from Node.js, using the Vec3 library for Position calculation.
var Minecraft = require('minecraft-pi');
var client = new Minecraft('localhost', 4711, function() {
// Use the client variable to play with the server!
client.chat('Yo dawg, I heard you like Node.js, so I put some Node.js in your Pi so you can Node.js while you Pi.');
client.setBlock(v(3, 14, 15), client.blocks['DIAMOND_BLOCK']);
});[sudo] npm install -g docco
docco lib/minecraft.js
open docs/minecraft.html