nonce/index.js

returns unique and ever increasing timestamps

module.exports = function(length) {
    var last = null
    , repeat = 0

    if (typeof length == 'undefined') length = 15

    return function() {
        var now = Math.pow(10, 2) * +new Date()

        if (now == last) {
            repeat++
        } else {
            repeat = 0
            last = now
        }

        var s = (now + repeat).toString()
        return +s.substr(s.length - length)
    }
}