Encodes and decodes JavaScript (Unicode/UCS-2) strings to UTF-7 ASCII strings. It supports two modes: UTF-7 as defined in RFC 2152 and Modified UTF-7 as defined by the IMAP standard in RFC 3501, section 5.1.3

RFC 2152

var utf7 = require('utf7');

var encoded = utf7.encode('Jyväskylä');
assert.equal('Jyv+AOQ-skyl+AOQ-', encoded);

var decoded = utf7.decode(encoded);
assert.equal('Jyväskylä', decoded);

By default, .encode() only encodes the default characeters defined in RFC 2152. To also encode optional characters, use .encodeAll() or specify the characters you want to encode as the second argument to .encode().

IMAP (RFC 3501)

var utf7 = require('utf7').imap;

var encoded = utf7.encode('"你好" heißt "Hallo"');
assert.equal('"&T2BZfQ-" hei&AN8-t "Hallo"', encoded);

var decoded = utf7.decode(encoded);
assert.equal('"你好" heißt "Hallo"', decoded);