lettercoder is an isomorphic decoding library for e-mail related applications written in TypeScript.

The following RFCs are supported by lettercoder:

• RFC 2045 (Quoted-Printable)
• RFC 2047 (MIME Words)

Usage

String with mixed MIME words and regular words (RFC 2047)

import { decodeMimeWords } from 'lettercoder';

decodeMimeWords('=?ISO-8859-1?Q?a?= b'); // a b

One MIME word (RFC 2047)

import { decodeMimeWord } from 'lettercoder';

decodeMimeWords('=?ISO-8859-1?Q?a?='); // a

Quoted-Printable: UTF-8 (RFC 2045)

import { decodeQuotedPrintable } from 'lettercoder';

decodeQuotedPrintable('=F0=9F=91=8D', 'utf-8'); // 👍

Quoted-Printable: Byte array (RFC 2045)

import { decodeQuotedPrintable } from 'lettercoder';

decodeQuotedPrintable('=DE=AD=BE=EF'); // Uint8Array(4) [ 222, 173, 190, 239 ]