UTF8 to Shift_JIS in Javascript

Background

The TextEncoder() in js does not support Shift_JIS, which means you may need to find some alternative ways to turn UTF-8 Japanese/Kana character into Shift_JIS encoding format for further handling in your use-case (such as FeliCa chip personalisation).

To verify whether a pair of hex values is in SJIS format - use this site. [1]

Know more about Japanese Character Set

See this presentation by MySQL.

Half-width Katakana in UTF-8

In Unicode, half-width katakana, which is called as hankaku (半角), is represented from position U+FF61 to U+FF9F.

	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F
FF60		｡	｢	｣	､	･	ｦ	ｧ	ｨ	ｩ	ｪ	ｫ	ｬ	ｭ	ｮ	ｯ
FF70	ｰ	ｱ	ｲ	ｳ	ｴ	ｵ	ｶ	ｷ	ｸ	ｹ	ｺ	ｻ	ｼ	ｽ	ｾ	ｿ
FF80	ﾀ	ﾁ	ﾂ	ﾃ	ﾄ	ﾅ	ﾆ	ﾇ	ﾈ	ﾉ	ﾊ	ﾋ	ﾌ	ﾍ	ﾎ	ﾏ
FF90	ﾐ	ﾑ	ﾒ	ﾓ	ﾔ	ﾕ	ﾖ	ﾗ	ﾘ	ﾙ	ﾚ	ﾛ	ﾜ	ﾝ	ﾞ	ﾟ

Read this article to learn more.

Existing library

encoding.js

If you cannot use external library for any reason

Implement yourself - use mapping, you can take reference to this script [2]

References

[1] “Hex to SJIS,” freaka.freehostia.com. http://freaka.freehostia.com/charset_js.html (accessed Sep. 24, 2023).

[2] toracatman, “toracatman/UTF-JIS,” GitHub, Jan. 26, 2023. https://github.com/toracatman/UTF-JIS (accessed Sep. 24, 2023).

[3] “Character Width (Half-width, Full-width) Converter Online,” DenCode. https://dencode.com/en/string/character-width (accessed Sep. 24, 2023).

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[1], [2], [3]