Human ready Base32 node.js

app.js

const assert = require('assert');

class Encoder {
	static get alpha () {
		return "0123456789ABCDEFGHJKLMNPQRSTVXYZ"
	}

	static getCode(number) {
		const r = number & 31;
		const diff = (number - r) >> 5;

		if (diff == 0) {
			return Encoder.toChar(r);
		}
		
		return Encoder.getCode( diff ) + Encoder.toChar(r);
	}

	static toChar(n) {
		return Encoder.alpha.charAt(n);
	}
}

function randomInt(min, max) {
    return Math.floor(Math.random() * (max - min) + min);
}

assert.strictEqual(Encoder.getCode(65535), "1ZZZ");
assert.strictEqual(Encoder.getCode(1234), "16J");
assert.strictEqual(Encoder.getCode(256), "80");
assert.strictEqual(Encoder.getCode(10000), "9QG");
assert.strictEqual(Encoder.getCode(20000), "KH0");

for (let i=0; i < 10; i++) console.log(Encoder.getCode(randomInt(0, 65535)));