numkey — numeric input formatting. One script tag.

It's a string, but it's a number. — Numeric input formatting, done once.
문자열인데 숫자인 필드 — 콤마·커서·정렬·앞자리 0, 한 번에 끝.

Try it — everything below is just markup / 전부 마크업만으로 동작합니다

Integer · <input data-numkey>

canonical:

2 decimals · <input data-numkey="2"> Negative · data-numkey-negative Paste sanitizing — try pasting ₩ 1,234,567원 or full-width １２３４

Korean amount reading / 한글 금액 병기 — 은행 UI의 "150만"을 마크업만으로

Type an amount · <input data-numkey data-numkey-korean>

The generated <span class="numkey-korean"> is unstyled — the "원" here comes from CSS ::after. Also a pure function: toKorean('927483041001') → 9,274억 8,304만 1,001.

Shorthand entry — try typing 3만5천 or 1.5억, then leave the field · data-numkey-korean-entry

A Korean draft is left alone while typing (no fight with the IME); blur converts it — 3만5천 → 35,000. The reading and any data-numkey-name hidden field see the parsed value even mid-draft.

Form POST, solved / 폼 전송은 hidden이 정식 값으로 — 서버 콤마 제거 불필요

<input data-numkey data-numkey-name="amount">

the hidden input will POST:

Locale (opt-in) / 로케일은 옵트인 — 기본값은 브라우저와 무관하게 고정

data-numkey is the on-switch; data-numkey-locale is an option on top of it that only changes how the value is drawn. The canonical value stays the same.
data-numkey가 스위치, data-numkey-locale은 그 위의 표시 옵션 — 정식 값은 그대로입니다.

<input data-numkey="2">                          <!-- everyone: 1,234,567.89 -->
<input data-numkey="2" data-numkey-locale="auto">  <!-- browser language:
                                                        de → 1.234.567,89
                                                        ko → 1,234,567.89 -->
<input data-numkey="2" data-numkey-locale="de-DE"> <!-- pinned German -->
<input data-numkey-locale="auto">                  <!-- ✗ nothing: no data-numkey -->

canonical stays:

No build step / JSP·PHP·정적 페이지 — 스크립트 태그 한 줄

<script src="https://cdn.jsdelivr.net/npm/@devslab/numkey"></script>

<input data-numkey>                       <!-- 1,234,567 -->
<input data-numkey="2">                   <!-- 1,234.56 -->
<input data-numkey data-numkey-negative>  <!-- minus ok -->

Vue 3 / React adapters and the full API: README. Wrong-keyboard-layout text in the same form? See numkey's sibling kokey.