The **textlint-rule-no-hankaku-kana** is a plug‑in for the JavaScript linting tool *textlint* that flags and automatically fixes any occurrence of half‑width Katakana characters (U+FF61‑FF9F) in Japanese text. It is aimed at writers, editors, and developers who want to enforce proper full‑width Katakana usage—especially those following Japanese style guides such as the JTF standard. The rule can be added via a `.textlintrc` file or the CLI and supports `textlint --fix` to normalize the characters to their NFC/NFD equivalents.