i64Base 
URL, Filename, AWS safe Base64 Integer Strings (BAS). Supports both fast conversions for regular integers and large integer strings (via alan/clarke/int-encoder). Assists with compression as fewer base 64 digits are needed to represent larger integers than base 10 digits. Unlike RFC-3548 Base 64 encodings, readability of BIS is improved for small integers by using an alphabet that extends base-converter in PHP and following node base-converter. This is a subset of the i64 project and has no dependencies.
Install
npm install i64
Usage
var i64 = require('i64Base'); // initial instance
i64.int([integer]) // get/set value as Integer
i64.valueOf([int64_string]) // value as BIS, set option
i64.new(config) // new instance factory
Examples
i64.int(64).valueOf() // _ integer to BIS
i64.valueOf('c').asInt() // 12 BIS to integer
To Do
Refactor i64 to extend this project.