diff --git a/packages/frontend/src/components/MkInput.vue b/packages/frontend/src/components/MkInput.vue
index b34b7aaf60..cc7ad8bb78 100644
--- a/packages/frontend/src/components/MkInput.vue
+++ b/packages/frontend/src/components/MkInput.vue
@@ -52,6 +52,7 @@ import type { SuggestionType } from '@/utility/autocomplete.js';
 import MkButton from '@/components/MkButton.vue';
 import { i18n } from '@/i18n.js';
 import { Autocomplete } from '@/utility/autocomplete.js';
+import { genId } from '@/utility/id.js';
 
 const props = defineProps<{
 	modelValue: string | number | null;
@@ -87,7 +88,7 @@ const emit = defineEmits<{
 
 const { modelValue, type, autofocus } = toRefs(props);
 const v = ref(modelValue.value);
-const id = Math.random().toString(); // TODO: uuid?
+const id = genId();
 const focused = ref(false);
 const changed = ref(false);
 const invalid = ref(false);
diff --git a/packages/frontend/src/components/MkSparkle.vue b/packages/frontend/src/components/MkSparkle.vue
index 2400c5ec7f..47955a7fd7 100644
--- a/packages/frontend/src/components/MkSparkle.vue
+++ b/packages/frontend/src/components/MkSparkle.vue
@@ -57,6 +57,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { onMounted, onUnmounted, ref, useTemplateRef } from 'vue';
+import { genId } from '@/utility/id.js';
 
 const particles = ref<{
 	id: string,
@@ -86,7 +87,7 @@ onMounted(() => {
 		const y = (Math.random() * (height.value - 64));
 		const sizeFactor = Math.random();
 		const particle = {
-			id: Math.random().toString(),
+			id: genId(),
 			x,
 			y,
 			size: 0.2 + ((sizeFactor / 10) * 3),
diff --git a/packages/frontend/src/components/MkTutorialDialog.Note.vue b/packages/frontend/src/components/MkTutorialDialog.Note.vue
index 95f53e7635..b77e67e9c6 100644
--- a/packages/frontend/src/components/MkTutorialDialog.Note.vue
+++ b/packages/frontend/src/components/MkTutorialDialog.Note.vue
@@ -29,6 +29,7 @@ import { i18n } from '@/i18n.js';
 import { globalEvents } from '@/events.js';
 import { $i } from '@/i.js';
 import MkNote from '@/components/MkNote.vue';
+import { genId } from '@/utility/id.js';
 
 const props = defineProps<{
 	phase: 'aboutNote' | 'howToReact';
@@ -83,7 +84,7 @@ function doNotification(emoji: string): void {
 	if (!$i || !emoji) return;
 
 	const notification: Misskey.entities.Notification = {
-		id: Math.random().toString(),
+		id: genId(),
 		createdAt: new Date().toUTCString(),
 		type: 'reaction',
 		reaction: emoji,
diff --git a/packages/frontend/src/pages/admin/announcements.vue b/packages/frontend/src/pages/admin/announcements.vue
index b2d7b4889a..e5903d6257 100644
--- a/packages/frontend/src/pages/admin/announcements.vue
+++ b/packages/frontend/src/pages/admin/announcements.vue
@@ -97,6 +97,7 @@ import { i18n } from '@/i18n.js';
 import { definePage } from '@/page.js';
 import MkFolder from '@/components/MkFolder.vue';
 import MkTextarea from '@/components/MkTextarea.vue';
+import { genId } from '@/utility/id.js';
 
 const announcementsStatus = ref<'active' | 'archived'>('active');
 
@@ -117,7 +118,7 @@ watch(announcementsStatus, (to) => {
 
 function add() {
 	announcements.value.unshift({
-		_id: Math.random().toString(36),
+		_id: genId(),
 		id: null,
 		title: 'New announcement',
 		text: '',
diff --git a/packages/frontend/src/pages/admin/federation-job-queue.chart.vue b/packages/frontend/src/pages/admin/federation-job-queue.chart.vue
index 4b10d682a5..b17eceadde 100644
--- a/packages/frontend/src/pages/admin/federation-job-queue.chart.vue
+++ b/packages/frontend/src/pages/admin/federation-job-queue.chart.vue
@@ -57,6 +57,7 @@ import { misskeyApi } from '@/utility/misskey-api.js';
 import { useStream } from '@/stream.js';
 import { i18n } from '@/i18n.js';
 import MkFolder from '@/components/MkFolder.vue';
+import { genId } from '@/utility/id.js';
 
 const connection = markRaw(useStream().useChannel('queueStats'));
 
@@ -113,7 +114,7 @@ onMounted(() => {
 	connection.on('stats', onStats);
 	connection.on('statsLog', onStatsLog);
 	connection.send('requestLog', {
-		id: Math.random().toString().substring(2, 10),
+		id: genId(),
 		length: 200,
 	});
 });
diff --git a/packages/frontend/src/pages/admin/overview.queue.vue b/packages/frontend/src/pages/admin/overview.queue.vue
index cf07cddced..e7e139b74d 100644
--- a/packages/frontend/src/pages/admin/overview.queue.vue
+++ b/packages/frontend/src/pages/admin/overview.queue.vue
@@ -41,6 +41,7 @@ import XChart from './overview.queue.chart.vue';
 import type { ApQueueDomain } from '@/pages/admin/queue.vue';
 import number from '@/filters/number.js';
 import { useStream } from '@/stream.js';
+import { genId } from '@/utility/id.js';
 
 const connection = markRaw(useStream().useChannel('queueStats'));
 
@@ -92,7 +93,7 @@ onMounted(() => {
 	connection.on('stats', onStats);
 	connection.on('statsLog', onStatsLog);
 	connection.send('requestLog', {
-		id: Math.random().toString().substring(2, 10),
+		id: genId(),
 		length: 100,
 	});
 });
diff --git a/packages/frontend/src/pages/admin/overview.vue b/packages/frontend/src/pages/admin/overview.vue
index caa888b51d..2ad5173618 100644
--- a/packages/frontend/src/pages/admin/overview.vue
+++ b/packages/frontend/src/pages/admin/overview.vue
@@ -84,6 +84,7 @@ import { useStream } from '@/stream.js';
 import { i18n } from '@/i18n.js';
 import { definePage } from '@/page.js';
 import MkFoldableSection from '@/components/MkFoldableSection.vue';
+import { genId } from '@/utility/id.js';
 
 const rootEl = useTemplateRef('rootEl');
 const serverInfo = ref<Misskey.entities.ServerInfoResponse | null>(null);
@@ -170,7 +171,7 @@ onMounted(async () => {
 
 	nextTick(() => {
 		queueStatsConnection.send('requestLog', {
-			id: Math.random().toString().substring(2, 10),
+			id: genId(),
 			length: 100,
 		});
 	});
diff --git a/packages/frontend/src/pages/reversi/game.board.vue b/packages/frontend/src/pages/reversi/game.board.vue
index c0c90cb993..69429728d0 100644
--- a/packages/frontend/src/pages/reversi/game.board.vue
+++ b/packages/frontend/src/pages/reversi/game.board.vue
@@ -158,6 +158,7 @@ import { userPage } from '@/filters/user.js';
 import * as sound from '@/utility/sound.js';
 import * as os from '@/os.js';
 import { confetti } from '@/utility/confetti.js';
+import { genId } from '@/utility/id.js';
 
 const $i = ensureSignin();
 
@@ -273,7 +274,7 @@ function putStone(pos: number) {
 		playbackRate: 1,
 	});
 
-	const id = Math.random().toString(36).slice(2);
+	const id = genId();
 	props.connection!.send('putStone', {
 		pos: pos,
 		id,
diff --git a/packages/frontend/src/pages/settings/navbar.vue b/packages/frontend/src/pages/settings/navbar.vue
index ef698fcd6e..e57195c8a2 100644
--- a/packages/frontend/src/pages/settings/navbar.vue
+++ b/packages/frontend/src/pages/settings/navbar.vue
@@ -70,11 +70,12 @@ import { definePage } from '@/page.js';
 import { prefer } from '@/preferences.js';
 import { PREF_DEF } from '@/preferences/def.js';
 import { getInitialPrefValue } from '@/preferences/manager.js';
+import { genId } from '@/utility/id.js';
 
 const Sortable = defineAsyncComponent(() => import('vuedraggable').then(x => x.default));
 
 const items = ref(prefer.s.menu.map(x => ({
-	id: Math.random().toString(),
+	id: genId(),
 	type: x,
 })));
 
@@ -93,7 +94,7 @@ async function addItem() {
 	});
 	if (canceled) return;
 	items.value = [...items.value, {
-		id: Math.random().toString(),
+		id: genId(),
 		type: item,
 	}];
 }
@@ -108,7 +109,7 @@ async function save() {
 
 function reset() {
 	items.value = getInitialPrefValue('menu').map(x => ({
-		id: Math.random().toString(),
+		id: genId(),
 		type: x,
 	}));
 }
diff --git a/packages/frontend/src/pages/settings/preferences.vue b/packages/frontend/src/pages/settings/preferences.vue
index 05e491ae37..678cfb93c0 100644
--- a/packages/frontend/src/pages/settings/preferences.vue
+++ b/packages/frontend/src/pages/settings/preferences.vue
@@ -796,6 +796,7 @@ import { globalEvents } from '@/events.js';
 import { claimAchievement } from '@/utility/achievements.js';
 import { instance } from '@/instance.js';
 import { ensureSignin } from '@/i.js';
+import { genId } from '@/utility/id.js';
 
 const $i = ensureSignin();
 
@@ -1009,7 +1010,7 @@ let smashTimer: number | null = null;
 
 function testNotification(): void {
 	const notification: Misskey.entities.Notification = {
-		id: Math.random().toString(),
+		id: genId(),
 		createdAt: new Date().toUTCString(),
 		isRead: false,
 		type: 'test',
diff --git a/packages/frontend/src/pages/settings/profile.vue b/packages/frontend/src/pages/settings/profile.vue
index cd1565f39e..ce7f31cd23 100644
--- a/packages/frontend/src/pages/settings/profile.vue
+++ b/packages/frontend/src/pages/settings/profile.vue
@@ -171,6 +171,7 @@ import { claimAchievement } from '@/utility/achievements.js';
 import { store } from '@/store.js';
 import MkInfo from '@/components/MkInfo.vue';
 import MkTextarea from '@/components/MkTextarea.vue';
+import { genId } from '@/utility/id.js';
 
 const $i = ensureSignin();
 
@@ -199,12 +200,12 @@ watch(() => profile, () => {
 	deep: true,
 });
 
-const fields = ref($i.fields.map(field => ({ id: Math.random().toString(), name: field.name, value: field.value })) ?? []);
+const fields = ref($i.fields.map(field => ({ id: genId(), name: field.name, value: field.value })) ?? []);
 const fieldEditMode = ref(false);
 
 function addField() {
 	fields.value.push({
-		id: Math.random().toString(),
+		id: genId(),
 		name: '',
 		value: '',
 	});
diff --git a/packages/frontend/src/utility/drive.ts b/packages/frontend/src/utility/drive.ts
index fcc847653d..0e10f80145 100644
--- a/packages/frontend/src/utility/drive.ts
+++ b/packages/frontend/src/utility/drive.ts
@@ -15,6 +15,7 @@ import { $i } from '@/i.js';
 import { instance } from '@/instance.js';
 import { globalEvents } from '@/events.js';
 import { getProxiedImageUrl } from '@/utility/media-proxy.js';
+import { genId } from '@/utility/id.js';
 
 type UploadReturnType = {
 	filePromise: Promise<Misskey.entities.DriveFile>;
@@ -195,7 +196,7 @@ export function chooseFileFromUrl(): Promise<Misskey.entities.DriveFile> {
 		}).then(({ canceled, result: url }) => {
 			if (canceled) return;
 
-			const marker = Math.random().toString(); // TODO: UUIDとか使う
+			const marker = genId();
 
 			// TODO: no websocketモード対応
 			const connection = useStream().useChannel('main');
diff --git a/packages/frontend/src/widgets/WidgetAiscript.vue b/packages/frontend/src/widgets/WidgetAiscript.vue
index c46fd81466..da71dcad29 100644
--- a/packages/frontend/src/widgets/WidgetAiscript.vue
+++ b/packages/frontend/src/widgets/WidgetAiscript.vue
@@ -29,6 +29,7 @@ import MkContainer from '@/components/MkContainer.vue';
 import { aiScriptReadline, createAiScriptEnv } from '@/aiscript/api.js';
 import { $i } from '@/i.js';
 import { i18n } from '@/i18n.js';
+import { genId } from '@/utility/id.js';
 
 const name = 'aiscript';
 
@@ -73,7 +74,7 @@ const run = async () => {
 		in: aiScriptReadline,
 		out: (value) => {
 			logs.value.push({
-				id: Math.random().toString(),
+				id: genId(),
 				text: value.type === 'str' ? value.value : utils.valToString(value),
 				print: true,
 			});
@@ -81,7 +82,7 @@ const run = async () => {
 		log: (type, params) => {
 			switch (type) {
 				case 'end': logs.value.push({
-					id: Math.random().toString(),
+					id: genId(),
 					text: utils.valToString(params.val, true),
 					print: false,
 				}); break;
diff --git a/packages/frontend/src/widgets/WidgetJobQueue.vue b/packages/frontend/src/widgets/WidgetJobQueue.vue
index 485e532d51..84fd4669cd 100644
--- a/packages/frontend/src/widgets/WidgetJobQueue.vue
+++ b/packages/frontend/src/widgets/WidgetJobQueue.vue
@@ -60,6 +60,7 @@ import kmg from '@/filters/kmg.js';
 import * as sound from '@/utility/sound.js';
 import { deepClone } from '@/utility/clone.js';
 import { prefer } from '@/preferences.js';
+import { genId } from '@/utility/id.js';
 
 const name = 'jobQueue';
 
@@ -144,7 +145,7 @@ connection.on('stats', onStats);
 connection.on('statsLog', onStatsLog);
 
 connection.send('requestLog', {
-	id: Math.random().toString().substring(2, 10),
+	id: genId(),
 	length: 1,
 });
 
diff --git a/packages/frontend/src/widgets/server-metric/cpu-mem.vue b/packages/frontend/src/widgets/server-metric/cpu-mem.vue
index 1f22e14a70..d8a876f936 100644
--- a/packages/frontend/src/widgets/server-metric/cpu-mem.vue
+++ b/packages/frontend/src/widgets/server-metric/cpu-mem.vue
@@ -106,7 +106,7 @@ onMounted(() => {
 	props.connection.on('stats', onStats);
 	props.connection.on('statsLog', onStatsLog);
 	props.connection.send('requestLog', {
-		id: Math.random().toString().substring(2, 10),
+		id: genId(),
 		length: 50,
 	});
 });
diff --git a/packages/frontend/src/widgets/server-metric/net.vue b/packages/frontend/src/widgets/server-metric/net.vue
index d78494b8d2..5e08a47100 100644
--- a/packages/frontend/src/widgets/server-metric/net.vue
+++ b/packages/frontend/src/widgets/server-metric/net.vue
@@ -52,6 +52,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { onMounted, onBeforeUnmount, ref } from 'vue';
 import * as Misskey from 'misskey-js';
 import bytes from '@/filters/bytes.js';
+import { genId } from '@/utility/id.js';
 
 const props = defineProps<{
 	connection: Misskey.ChannelConnection<Misskey.Channels['serverStats']>,
@@ -76,7 +77,7 @@ onMounted(() => {
 	props.connection.on('stats', onStats);
 	props.connection.on('statsLog', onStatsLog);
 	props.connection.send('requestLog', {
-		id: Math.random().toString().substring(2, 10),
+		id: genId(),
 		length: 50,
 	});
 });