Xbase85: Most Efficient JSON Friendly Byte Encoder

JavaScript Base85 Encoding Implementation using Z85's alphabet (no backward slash and quotes)

Usage

import {encode,decode,decodeStr} from '@x-currency/xbase85';

// .encode accepts both bytes (Uint8Array) and string 
console.log( 'encode', encode( Uint8Array.from([0,1,2,3]) ) ); // 009c6
console.log( 'encode' ,encode( 'Hello World!') ); // nm=QNzY&b1A+]nf

// .decode output bytes (Uint8Array) 
console.log( 'decode', decode('009c6') ); // Uint8Array(4) [0,1,2,3]

// .decodeStr output string 
console.log( 'decodeStr', decodeStr('nm=QNzY&b1A+]nf') ); // Hello World!

Usage in ES5

const { encode, decode, decodeStr } = require('@x-currency/xbase85');

console.log(encode('Hello World!'));
console.log(decode('nm=QNzY&b1A+]nf'));
console.log(decodeStr('nm=QNzY&b1A+]nf'));

Install

npm install @x-currency/xbase85 --save

Note

// 
// Note: To enjoy the benefits of Base85 your data MUST have the following properties:
// - data (Uint8Array|String) to be encoded MUST be divideable by 4 (data.length % 4 === 0).
// - data (string) to be decoded MUST be divideable by 5 (data.length % 5 === 0).
// 
try {
  console.log('encode',encode(Uint8Array.from([1,2,3])));  // must be atleast 4
} catch(err) {
  // console.log('expected encode err', String(err) );
  // Error: data.length must be divideable by 4 to make base85 encoding possible.
}
try {
  console.log('encode',decode('1234')); // must be atleast 5
} catch(err) {
    // console.log('expected decode err', String(err) );
    // Error: encoded_string.length must be divideable by 5 to make base85 decoding possible.
}