rfc2231 Encode and decode rfc2231 (MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations) and rfc5987 (Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters). var rfc2231 = require('rfc2231'); console.log(rfc2231.unfoldAndDecodeParameters({ 'title*0*': "us-ascii'en'This%20is%20even%20more%20", 'title*1*': '%2A%2A%2Afun%2A%2A%2A%20', 'title*2': "is it not?"});// {title: "This is even more ***fun*** is it not?"} console.log(rfc2231.encodeAndFoldParameters({ foo: '0123456789012345678901234567890123456789012345678901234567890123456789'});// {// 'foo*0': '"012345678901234567890123456789012345678901234567890123456789"',// 'foo*1': '"0123456789"'// } rfc2231.unfoldAndDecodeParameters takes advantage of the iconv module if available, and otherwise falls back to iconv-lite.