UUID to any base-n for Python and Javascript

uuid_to_any_base_n.js

function basen(number, alphabet) {

	let output = ""
	let base = alphabet.length;

	while (number > 0) {
		output += alphabet.charAt(Number(BigInt(number) % BigInt(base)))
		number = BigInt(number) / BigInt(base)
	}

	return output.split("").reverse().join("")
}

function encode(uuid, alphabet) {

	let num = uuid
	let pad = alphabet.charAt(0)
	let base = alphabet.length;
	let length = Math.floor(Math.ceil(128 / (Math.log(base) / Math.log(2))))
	
	let encoded = basen(num, alphabet)
	return encoded.padStart(length, pad)
}

function random() { // 32 bit random
	return Math.floor(Math.random() * (2 ** 32))
}

function uuid4() { // FAKE UUID as BigInt
	return BigInt(random()) << 96n | BigInt(random()) << 64n | BigInt(random()) << 32n | BigInt(random())
}

function main() {

	let uuid = uuid4()
	// let uuid = 0x09d4579743ba4ae59c92481d29650a19n

	let b02 = encode(uuid, "01")
	let b08 = encode(uuid, "01234567")
	let b10 = encode(uuid, "0123456789")
	let b16 = encode(uuid, "0123456789abcdef")
	let b32 = encode(uuid, "abcdefghijklmnopqrstuvwxyz234567")
	let b36 = encode(uuid, "0123456789abcdefghijklmnopqrstuvwxyz")
	let b48 = encode(uuid, "ABCDEFGHJKLMNOPQRSTVWXYZabcdefghijkmnopqrstvwxyz")
	let b52 = encode(uuid, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
	let b58 = encode(uuid, "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz") // btc
	let b62 = encode(uuid, "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
	let b64 = encode(uuid, "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_") // url

	console.log(b02)
	console.log(b08)
	console.log(b10)
	console.log(b16)
	console.log(b32)
	console.log(b36)
	console.log(b48)
	console.log(b52)
	console.log(b58)
	console.log(b62)
	console.log(b64)
}

main()

uuid_to_any_base_n.py

#!/bin/env python3

import math
import string
from uuid import UUID, uuid4

def basen(number, alphabet):
	output = ""
	base = len(alphabet)
	while number:
		output += alphabet[number % base]
		number //= base
	return output[::-1]

def encode(uuid, alphabet):
	
	num = uuid.int
	pad = alphabet[0]
	base = len(alphabet)
	length = int(math.ceil(128 / (math.log(base) / math.log(2))))
	
	encoded = basen(num, alphabet)
	return encoded.rjust(length, pad)

def main():

	uuid = uuid4()
	# uuid = UUID(int=0x09d4579743ba4ae59c92481d29650a19)

	b02 = encode(uuid, "01")
	b08 = encode(uuid, "01234567")
	b10 = encode(uuid, "0123456789")
	b16 = encode(uuid, "0123456789abcdef")
	b32 = encode(uuid, "abcdefghijklmnopqrstuvwxyz234567")
	b36 = encode(uuid, "0123456789abcdefghijklmnopqrstuvwxyz")
	b48 = encode(uuid, "ABCDEFGHJKLMNOPQRSTVWXYZabcdefghijkmnopqrstvwxyz")
	b52 = encode(uuid, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
	b58 = encode(uuid, "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz") # btc
	b62 = encode(uuid, "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
	b64 = encode(uuid, "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_") # url

	print(b02)
	print(b08)
	print(b10)
	print(b16)
	print(b32)
	print(b36)
	print(b48)
	print(b52)
	print(b58)
	print(b62)
	print(b64)

main()

Output:

0101111011111011110100011010010001110000000000011111111...1100001101100101100100101000
1367675064434001342575140377726657415454450
126254950166965959048487126726591535400
5efbd1a47002e2be981ffd6d7c365928
c67pi2i4ac4k7jqh75nv6dmwji
5mfqyim580cl81vsjxvwvfoko
OzzrrqHXFvFzJaMhHnlgWda
CMKAeuTRVAjDsuGplnOoUwo
CjHKMF4sdzARNkgevXBwUb
2tEML0DzrByZKyPzb47qLQ
1U-z6aS0BYlfWV_MryDbae