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diff --git a/ext/js/language/ja/language-japanese.js b/ext/js/language/ja/language-japanese.js
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+++ b/ext/js/language/ja/language-japanese.js
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+/*
+ * Copyright (C) 2024  Yomitan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {basicTextPreprocessorOptions} from '../text-preprocessors.js';
+import {convertAlphabeticToKana} from './japanese-wanakana.js';
+import {collapseEmphaticSequences, convertHalfWidthKanaToFullWidth, convertHiraganaToKatakana, convertKatakanaToHiragana, convertNumericToFullWidth} from './japanese.js';
+
+/** @type {import('language-japanese').JapaneseLanguageDescriptor} */
+export const descriptor = {
+    name: 'Japanese',
+    iso: 'ja',
+    exampleText: '読め',
+    textPreprocessors: {
+        convertHalfWidthCharacters: {
+            name: 'Convert half width characters to full width',
+            description: 'ﾖﾐﾁｬﾝ → ヨミチャン',
+            options: basicTextPreprocessorOptions,
+            /** @type {import('language').TextPreprocessorFunction<boolean>} */
+            process: (str, setting, sourceMap) => (setting ? convertHalfWidthKanaToFullWidth(str, sourceMap) : str)
+        },
+        convertNumericCharacters: {
+            name: 'Convert numeric characters to full width',
+            description: '1234 → １２３４',
+            options: basicTextPreprocessorOptions,
+            /** @type {import('language').TextPreprocessorFunction<boolean>} */
+            process: (str, setting) => (setting ? convertNumericToFullWidth(str) : str)
+        },
+        convertAlphabeticCharacters: {
+            name: 'Convert alphabetic characters to hiragana',
+            description: 'yomichan → よみちゃん',
+            options: basicTextPreprocessorOptions,
+            /** @type {import('language').TextPreprocessorFunction<boolean>} */
+            process: (str, setting, sourceMap) => (setting ? convertAlphabeticToKana(str, sourceMap) : str)
+        },
+        convertHiraganaToKatakana: {
+            name: 'Convert hiragana to katakana',
+            description: 'よみちゃん → ヨミチャン',
+            options: basicTextPreprocessorOptions,
+            /** @type {import('language').TextPreprocessorFunction<boolean>} */
+            process: (str, setting) => (setting ? convertHiraganaToKatakana(str) : str)
+        },
+        convertKatakanaToHiragana: {
+            name: 'Convert katakana to hiragana',
+            description: 'ヨミチャン → よみちゃん',
+            options: basicTextPreprocessorOptions,
+            /** @type {import('language').TextPreprocessorFunction<boolean>} */
+            process: (str, setting) => (setting ? convertKatakanaToHiragana(str) : str)
+        },
+        collapseEmphaticSequences: {
+            name: 'Collapse emphatic character sequences',
+            description: 'すっっごーーい → すっごーい / すごい',
+            options: [[false, false], [true, false], [true, true]],
+            /** @type {import('language').TextPreprocessorFunction<[collapseEmphatic: boolean, collapseEmphaticFull: boolean]>} */
+            process: (str, setting, sourceMap) => {
+                const [collapseEmphatic, collapseEmphaticFull] = setting;
+                if (collapseEmphatic) {
+                    str = collapseEmphaticSequences(str, collapseEmphaticFull, sourceMap);
+                }
+                return str;
+            }
+        }
+    }
+};