base62-py

Custom Base-62 Encoder

This repository contains the version of my encoder/decoder for Base-62 in three languages:

• Golang;
• Python;
• TypeScript.

Motivation

I needed an efficient way to apply a Base-62 encoding/decoding algorithm working the same way in TypeScript/Javascript, Golang and Python environments.

Usage

Both versions use the same following dictionary:

Value	Character	Value	Character	Value	Character	Value	Character	Value	Character
0	0	13	d	26	q	39	D	52	Q
1	1	14	e	27	r	40	E	53	R
2	2	15	f	28	s	41	F	54	S
3	3	16	g	29	t	42	G	55	T
4	4	17	h	30	u	43	H	56	U
5	5	18	i	31	v	44	I	57	V
6	6	19	j	32	w	45	J	58	W
7	7	20	k	33	x	46	K	59	X
8	8	21	l	34	y	47	L	60	Y
9	9	22	m	35	z	48	M	61	Z
10	a	23	n	36	A	49	N
11	b	24	o	37	B	50	O
12	c	25	p	38	C	51	P

In other words, they use the following base: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.

pip install base62-py

from base62 import decode, encode, is_valid_base62

value = 18969

encoded = encode(value)

# 4VX
print(encoded)

decoded = decode(encoded)

assert value == decoded

assert is_valid_base62(encoded)

Tests

$ pip install -e . && python3 -m unittest discover

License

Both versions are available under a MIT license (see LICENSE).

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© 2021-2026 Cyril Dever. All rights reserved.