diff --git a/packages/backend/src/remote/activitypub/models/person.ts b/packages/backend/src/remote/activitypub/models/person.ts
index c5519ba03..14abf3b1d 100644
--- a/packages/backend/src/remote/activitypub/models/person.ts
+++ b/packages/backend/src/remote/activitypub/models/person.ts
@@ -147,11 +147,11 @@ export async function fetchPerson(
 	}
 
 	//#region Returns if already registered with this server
-	const exist = await Users.findOneBy({ uri });
+	const user = await Users.findOneBy({ uri });
 
-	if (exist) {
-		await uriPersonCache.set(uri, exist);
-		return exist;
+	if (user != null) {
+		await uriPersonCache.set(uri, user);
+		return user;
 	}
 	//#endregion
 
@@ -396,9 +396,9 @@ export async function updatePerson(
 	}
 
 	//#region Already registered on this server?
-	const exist = (await Users.findOneBy({ uri })) as IRemoteUser;
+	const user = (await Users.findOneBy({ uri })) as IRemoteUser;
 
-	if (exist == null) {
+	if (user == null) {
 		return;
 	}
 	//#endregion
@@ -416,17 +416,15 @@ export async function updatePerson(
 		[person.icon, person.image].map((img) =>
 			img == null
 				? Promise.resolve(null)
-				: resolveImage(exist, img).catch(() => null),
+				: resolveImage(user, img).catch(() => null),
 		),
 	);
 
 	// Custom pictogram acquisition
-	const emojis = await extractEmojis(person.tag || [], exist.host).catch(
-		(e) => {
-			logger.info(`extractEmojis: ${e}`);
-			return [] as Emoji[];
-		},
-	);
+	const emojis = await extractEmojis(person.tag || [], user.host).catch((e) => {
+		logger.info(`extractEmojis: ${e}`);
+		return [] as Emoji[];
+	});
 
 	const emojiNames = emojis.map((emoji) => emoji.name);
 
@@ -518,11 +516,11 @@ export async function updatePerson(
 	}
 
 	// Update user
-	await Users.update(exist.id, updates);
+	await Users.update(user.id, updates);
 
 	if (person.publicKey) {
 		await UserPublickeys.update(
-			{ userId: exist.id },
+			{ userId: user.id },
 			{
 				keyId: person.publicKey.id,
 				keyPem: person.publicKey.publicKeyPem,
@@ -531,7 +529,7 @@ export async function updatePerson(
 	}
 
 	await UserProfiles.update(
-		{ userId: exist.id },
+		{ userId: user.id },
 		{
 			url: url,
 			fields,
@@ -543,15 +541,15 @@ export async function updatePerson(
 		},
 	);
 
-	publishInternalEvent("remoteUserUpdated", { id: exist.id });
+	publishInternalEvent("remoteUserUpdated", { id: user.id });
 
 	// Hashtag Update
-	updateUsertags(exist, tags);
+	updateUsertags(user, tags);
 
 	// If the user in question is a follower, followers will also be updated.
 	await Followings.update(
 		{
-			followerId: exist.id,
+			followerId: user.id,
 		},
 		{
 			followerSharedInbox:
@@ -560,7 +558,7 @@ export async function updatePerson(
 		},
 	);
 
-	await updateFeatured(exist.id, resolver).catch((err) => logger.error(err));
+	await updateFeatured(user.id, resolver).catch((err) => logger.error(err));
 }
 
 /**
@@ -576,10 +574,10 @@ export async function resolvePerson(
 	if (typeof uri !== "string") throw new Error("uri is not string");
 
 	//#region If already registered on this server, return it.
-	const exist = await fetchPerson(uri);
+	const user = await fetchPerson(uri);
 
-	if (exist) {
-		return exist;
+	if (user != null) {
+		return user;
 	}
 	//#endregion
 
diff --git a/packages/backend/src/server/api/endpoints/gallery/posts/unlike.ts b/packages/backend/src/server/api/endpoints/gallery/posts/unlike.ts
index 772dc9202..03bc299b9 100644
--- a/packages/backend/src/server/api/endpoints/gallery/posts/unlike.ts
+++ b/packages/backend/src/server/api/endpoints/gallery/posts/unlike.ts
@@ -38,17 +38,17 @@ export default define(meta, paramDef, async (ps, user) => {
 		throw new ApiError(meta.errors.noSuchPost);
 	}
 
-	const exist = await GalleryLikes.findOneBy({
+	const like = await GalleryLikes.findOneBy({
 		postId: post.id,
 		userId: user.id,
 	});
 
-	if (exist == null) {
+	if (like == null) {
 		throw new ApiError(meta.errors.notLiked);
 	}
 
 	// Delete like
-	await GalleryLikes.delete(exist.id);
+	await GalleryLikes.delete(like.id);
 
 	GalleryPosts.decrement({ id: post.id }, "likedCount", 1);
 });
diff --git a/packages/backend/src/server/api/endpoints/mute/delete.ts b/packages/backend/src/server/api/endpoints/mute/delete.ts
index cc67a44c2..cd00c1a8a 100644
--- a/packages/backend/src/server/api/endpoints/mute/delete.ts
+++ b/packages/backend/src/server/api/endpoints/mute/delete.ts
@@ -56,18 +56,18 @@ export default define(meta, paramDef, async (ps, user) => {
 	});
 
 	// Check not muting
-	const exist = await Mutings.findOneBy({
+	const muting = await Mutings.findOneBy({
 		muterId: muter.id,
 		muteeId: mutee.id,
 	});
 
-	if (exist == null) {
+	if (muting == null) {
 		throw new ApiError(meta.errors.notMuting);
 	}
 
 	// Delete mute
 	await Mutings.delete({
-		id: exist.id,
+		id: muting.id,
 	});
 
 	publishUserEvent(user.id, "unmute", mutee);
diff --git a/packages/backend/src/server/api/endpoints/notes/favorites/delete.ts b/packages/backend/src/server/api/endpoints/notes/favorites/delete.ts
index 9a0976748..e05d04a96 100644
--- a/packages/backend/src/server/api/endpoints/notes/favorites/delete.ts
+++ b/packages/backend/src/server/api/endpoints/notes/favorites/delete.ts
@@ -42,15 +42,15 @@ export default define(meta, paramDef, async (ps, user) => {
 	});
 
 	// if already favorited
-	const exist = await NoteFavorites.findOneBy({
+	const favorite = await NoteFavorites.findOneBy({
 		noteId: note.id,
 		userId: user.id,
 	});
 
-	if (exist == null) {
+	if (favorite == null) {
 		throw new ApiError(meta.errors.notFavorited);
 	}
 
 	// Delete favorite
-	await NoteFavorites.delete(exist.id);
+	await NoteFavorites.delete(favorite.id);
 });
diff --git a/packages/backend/src/server/api/endpoints/pages/unlike.ts b/packages/backend/src/server/api/endpoints/pages/unlike.ts
index 07bf3fbf4..e607d7a54 100644
--- a/packages/backend/src/server/api/endpoints/pages/unlike.ts
+++ b/packages/backend/src/server/api/endpoints/pages/unlike.ts
@@ -38,17 +38,17 @@ export default define(meta, paramDef, async (ps, user) => {
 		throw new ApiError(meta.errors.noSuchPage);
 	}
 
-	const exist = await PageLikes.findOneBy({
+	const like = await PageLikes.findOneBy({
 		pageId: page.id,
 		userId: user.id,
 	});
 
-	if (exist == null) {
+	if (like == null) {
 		throw new ApiError(meta.errors.notLiked);
 	}
 
 	// Delete like
-	await PageLikes.delete(exist.id);
+	await PageLikes.delete(like.id);
 
 	Pages.decrement({ id: page.id }, "likedCount", 1);
 });
diff --git a/packages/backend/src/server/api/endpoints/renote-mute/delete.ts b/packages/backend/src/server/api/endpoints/renote-mute/delete.ts
index fb4c972af..7a898141c 100644
--- a/packages/backend/src/server/api/endpoints/renote-mute/delete.ts
+++ b/packages/backend/src/server/api/endpoints/renote-mute/delete.ts
@@ -45,18 +45,18 @@ export default define(meta, paramDef, async (ps, user) => {
 	});
 
 	// Check not muting
-	const exist = await RenoteMutings.findOneBy({
+	const muting = await RenoteMutings.findOneBy({
 		muterId: muter.id,
 		muteeId: mutee.id,
 	});
 
-	if (exist == null) {
+	if (muting == null) {
 		throw new ApiError(meta.errors.notMuting);
 	}
 
 	// Delete mute
 	await RenoteMutings.delete({
-		id: exist.id,
+		id: muting.id,
 	});
 
 	// publishUserEvent(user.id, "unmute", mutee);
diff --git a/packages/backend/src/server/api/endpoints/sw/register.ts b/packages/backend/src/server/api/endpoints/sw/register.ts
index 41be4bf74..6268ae26d 100644
--- a/packages/backend/src/server/api/endpoints/sw/register.ts
+++ b/packages/backend/src/server/api/endpoints/sw/register.ts
@@ -57,8 +57,7 @@ export const paramDef = {
 } as const;
 
 export default define(meta, paramDef, async (ps, me) => {
-	// if already subscribed
-	const exist = await SwSubscriptions.findOneBy({
+	const subscription = await SwSubscriptions.findOneBy({
 		userId: me.id,
 		endpoint: ps.endpoint,
 		auth: ps.auth,
@@ -67,13 +66,14 @@ export default define(meta, paramDef, async (ps, me) => {
 
 	const instance = await fetchMeta(true);
 
-	if (exist != null) {
+	// if already subscribed
+	if (subscription != null) {
 		return {
 			state: "already-subscribed" as const,
 			key: instance.swPublicKey,
 			userId: me.id,
-			endpoint: exist.endpoint,
-			sendReadMessage: exist.sendReadMessage,
+			endpoint: subscription.endpoint,
+			sendReadMessage: subscription.sendReadMessage,
 		};
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/sw/show-registration.ts b/packages/backend/src/server/api/endpoints/sw/show-registration.ts
index c7a9609cf..3ccb7de94 100644
--- a/packages/backend/src/server/api/endpoints/sw/show-registration.ts
+++ b/packages/backend/src/server/api/endpoints/sw/show-registration.ts
@@ -42,16 +42,16 @@ export const paramDef = {
 
 // eslint-disable-next-line import/no-default-export
 export default define(meta, paramDef, async (ps, me) => {
-	const exist = await SwSubscriptions.findOneBy({
+	const subscription = await SwSubscriptions.findOneBy({
 		userId: me.id,
 		endpoint: ps.endpoint,
 	});
 
-	if (exist != null) {
+	if (subscription != null) {
 		return {
-			userId: exist.userId,
-			endpoint: exist.endpoint,
-			sendReadMessage: exist.sendReadMessage,
+			userId: subscription.userId,
+			endpoint: subscription.endpoint,
+			sendReadMessage: subscription.sendReadMessage,
 		};
 	}
 
diff --git a/packages/backend/src/services/note/reaction/delete.ts b/packages/backend/src/services/note/reaction/delete.ts
index 82648249e..15c6d1cf6 100644
--- a/packages/backend/src/services/note/reaction/delete.ts
+++ b/packages/backend/src/services/note/reaction/delete.ts
@@ -13,13 +13,13 @@ export default async (
 	user: { id: User["id"]; host: User["host"] },
 	note: Note,
 ) => {
-	// if already unreacted
-	const exist = await NoteReactions.findOneBy({
+	const reaction = await NoteReactions.findOneBy({
 		noteId: note.id,
 		userId: user.id,
 	});
 
-	if (exist == null) {
+	// if already unreacted
+	if (reaction == null) {
 		throw new IdentifiableError(
 			"60527ec9-b4cb-4a88-a6bd-32d3ad26817d",
 			"not reacted",
@@ -27,7 +27,7 @@ export default async (
 	}
 
 	// Delete reaction
-	const result = await NoteReactions.delete(exist.id);
+	const result = await NoteReactions.delete(reaction.id);
 
 	if (result.affected !== 1) {
 		throw new IdentifiableError(
@@ -37,7 +37,7 @@ export default async (
 	}
 
 	// Decrement reactions count
-	const sql = `jsonb_set("reactions", '{${exist.reaction}}', (COALESCE("reactions"->>'${exist.reaction}', '0')::int - 1)::text::jsonb)`;
+	const sql = `jsonb_set("reactions", '{${reaction.reaction}}', (COALESCE("reactions"->>'${reaction.reaction}', '0')::int - 1)::text::jsonb)`;
 	await Notes.createQueryBuilder()
 		.update()
 		.set({
@@ -49,14 +49,14 @@ export default async (
 	Notes.decrement({ id: note.id }, "score", 1);
 
 	publishNoteStream(note.id, "unreacted", {
-		reaction: decodeReaction(exist.reaction).reaction,
+		reaction: decodeReaction(reaction.reaction).reaction,
 		userId: user.id,
 	});
 
 	//#region 配信
 	if (Users.isLocalUser(user) && !note.localOnly) {
 		const content = renderActivity(
-			renderUndo(await renderLike(exist, note), user),
+			renderUndo(await renderLike(reaction, note), user),
 		);
 		const dm = new DeliverManager(user, content);
 		if (note.userHost !== null) {