var keycode = require('keycode');
document.addEventListener('keydown', function(e) {
  console.log("You pressed", keycode(e))
})

document.body.addEventListener('keyup', function(e) {
  console.log(keycode(e)) // prints name of key
})

keycode(13) // => 'enter'

keycode('Enter') // => 13
// keycode is not case sensitive
keycode('eNtEr') // => 13

> for (var alias in keycode.aliases) { console.log(alias, keycode(keycode(alias))) }
ctl ctrl
pause pause/break
break pause/break
caps caps lock
escape esc
pgup page up
pgdn page down
ins insert
del delete
spc space

// assume event is an keydown event with key 'enter'
keycode.isEventKey(event, 'enter') // => true
keycode.isEventKey(event, 'down') // => false
keycode.isEventKey(event, 13) // => true
keycode.isEventKey(event, 40) // => false

keycode.names[13] // => 'enter'
keycode.codes['enter'] // => 13