@algorithm.ts/base64

A typescript implementation of the base64 encoding. Unlike traditional implementations, this project uses Uint8Array to represent byte streams.

Install

• npm

  npm install --save @algorithm.ts/base64

• yarn

  yarn add @algorithm.ts/base64

Usage

• encode: Encode a Uint8Array into base64 encoded string.

  // node env: import { TextEncoder } from 'util'
  import { encode } from '@algorithm.ts/base64'
  
  const getBytes = (text: string): Uint8Array => {
    const textEncoder = new TextEncoder()
    const data: Uint8Array = textEncoder.encode(text)
    return data
  }
  
  encode(getBytes('Hello, world!')) // => 'SGVsbG8sIHdvcmxkIQ=='

• decode: Decode a base64 encoded string to Uint8Array

  import { decode } from '@algorithm.ts/base64'
  
  const data: Uint8Array = decode('SGVsbG8sIHdvcmxkIQ==')
  const textDecoder = new TextDecoder()
  textDecoder.decode(data) // => 'Hello, world!'

• validate: Check if a string is base64 encoded.

  validate('SGVsbG8sIHdvcmxkIQ==') // => true

• Custom code map.

  // node env: import { TextEncoder } from 'util'
  import { Base64 } from '@algorithm.ts/base64'
  
  const getBytes = (text: string): Uint8Array => {
    const textEncoder = new TextEncoder()
    const data: Uint8Array = textEncoder.encode(text)
    return data
  }
  
  const base64 = new Base64({
    CODES: '#ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+'
  })
  base64.encode(getBytes('Hello, world!')) // => RFUraF7rHGcublwjHP==

Related

• BASE64 Table

  Index	Binary	Char	Index	Binary	Char	Index	Binary	Char	Index	Binary	Char
  0	000000	A	16	010000	Q	32	100000	g	48	110000	w
  1	000001	B	17	010001	R	33	100001	h	49	110001	x
  2	000010	C	18	010010	S	34	100010	i	50	110010	y
  3	000011	D	19	010011	T	35	100011	j	51	110011	z
  4	000100	E	20	010100	U	36	100100	k	52	110100	0
  5	000101	F	21	010101	V	37	100101	l	53	110101	1
  6	000110	G	22	010110	W	38	100110	m	54	110110	2
  7	000111	H	23	010111	X	39	100111	n	55	110111	3
  8	001000	I	24	011000	Y	40	101000	o	56	111000	4
  9	001001	J	25	011001	Z	41	101001	p	57	111001	5
  10	001010	K	26	011010	a	42	101010	q	58	111010	6
  11	001011	L	27	011011	b	43	101011	r	59	111011	7
  12	001100	M	28	011100	c	44	101100	s	60	111100	8
  13	001101	N	29	011101	d	45	101101	t	61	111101	9
  14	001110	O	30	011110	e	46	101110	u	62	111110	+
  15	001111	P	31	011111	f	47	101111	v	63	111111	/

• Base64 | Wikipedia

• base-64 | github

• atob() | MDN

• btoa() | MDN