URL safe Base64 Integer Strings (BIS) and conversion tools. Supports both fast conversions for regular integers and large integer strings. 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


URL safe base64 integer conversion tools

npm install i64
var i64 = require('i64');
i64.valueOf([int64_string])       // value as Numeric Base64 String, set option
i64.isI64(int64_string)           // true if a valid int64_string is passed
i64.asInt([integer])              // get/set value as Integer
i64.asHex([hex_string])           // get/set value as Hex
i64.config([config])              // get/set configuration
i64.new(config)                   // new instance factory

As an extension of Base36 digits, Numeric Base64 String digits are:

Base64  Base10
------  -------
0..9    0 to 9
a..z    10 to 25
A..Z    26 to 61
-       62       (dash)
_       63       (underscore)
i64.asInt(64)                 // _      integer to base64
i64.as64('a').asInt()         // 10     base64 to integer 
i64.asHex('ff').asInt()       // 255    hex to integer 
   // future use: part of asDate, asMicrotime and asGeo

Large integer string conversions are handled complements of alan/clarke/int-encoder.

Normal integers are handled by a faster radix converter.