byte-base64

base64 utilities for TypeScript and JavaScript.

This library allows you to encode all the following data structures to a base64-encoded string and back:

• Uint8Array of bytes
• JS array of bytes - encoded as numbers from 0 to 255
• JS string - using any encoding supported by TextEncoder and TextDecoder

All other known solutions and approaches provide only a limited support for these features. In particular, atob and btoa only support ASCII strings.

byte-base64 is available as npm package.

npm i byte-base64

Consumption:

import * as base64 from "byte-base64";

Functions:

• bytesToBase64(bytes: number[] | Uint8Array): string - Encodes a Uint8Array or JS array of bytes to a base64-encoded string.
• base64ToBytes(str: string): Uint8Array - Decodes a base64-encoded string to a Uint8Array of bytes. If str is not a valid base64-encoded string, throws new Error("Unable to parse base64 string.").
• base64encode(str: string, encoder: { encode: (str: string) => Uint8Array | number[] } = new TextEncoder()) - Encodes a JS string to a base64-encoded string using the specified character encoding. The encoding defaults to new TextEncoder() which represents UTF-8 encoding.
• base64decode(str: string, decoder: { decode: (bytes: Uint8Array) => string } = new TextDecoder()) - Decodes a base64-encoded string to a JS string using the specified character encoding. The encoding defaults to new TextDecoder() which represents UTF-8 encoding. If str is not a valid base64-encoded string, throws new Error("Unable to parse base64 string.").

TextEncoder supports only UTF-8 encoding in the majority of browsers. For more encodings, consider using a polyfill.

Project license is MIT.