diff --git a/packages/backend/src/misc/secure-rndstr.ts b/packages/backend/src/misc/secure-rndstr.ts
deleted file mode 100644
index 966e8756..00000000
--- a/packages/backend/src/misc/secure-rndstr.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import { genString } from "native-utils/built/index.js";
-
-export function secureRndstr(length = 32, _ = true): string {
-	return genString(length);
-}
diff --git a/packages/backend/src/server/api/common/generate-native-user-token.ts b/packages/backend/src/server/api/common/generate-native-user-token.ts
index 5a8b41b7..7b23e682 100644
--- a/packages/backend/src/server/api/common/generate-native-user-token.ts
+++ b/packages/backend/src/server/api/common/generate-native-user-token.ts
@@ -1,3 +1,3 @@
-import { secureRndstr } from "@/misc/secure-rndstr.js";
+import { genString } from "native-utils/built/index.js";
 
-export default () => secureRndstr(16, true);
+export default () => genString(16);
diff --git a/packages/backend/src/server/api/endpoints/app/create.ts b/packages/backend/src/server/api/endpoints/app/create.ts
index e32edf12..c78ef88a 100644
--- a/packages/backend/src/server/api/endpoints/app/create.ts
+++ b/packages/backend/src/server/api/endpoints/app/create.ts
@@ -2,7 +2,7 @@ import define from "@/server/api/define.js";
 import { Apps } from "@/models/index.js";
 import { genId } from "@/misc/gen-id.js";
 import { unique } from "@/prelude/array.js";
-import { secureRndstr } from "@/misc/secure-rndstr.js";
+import { genString } from "native-utils/built/index.js";
 
 export const meta = {
 	tags: ["app"],
@@ -41,7 +41,7 @@ export default define(meta, paramDef, async (ps, user) => {
 			includeSecret: true,
 		});
 	// Generate secret
-	const secret = secureRndstr(32, true);
+	const secret = genString(32);
 
 	// for backward compatibility
 	const permission = unique(
diff --git a/packages/backend/src/server/api/endpoints/auth/accept.ts b/packages/backend/src/server/api/endpoints/auth/accept.ts
index 088de786..c92c97aa 100644
--- a/packages/backend/src/server/api/endpoints/auth/accept.ts
+++ b/packages/backend/src/server/api/endpoints/auth/accept.ts
@@ -3,7 +3,7 @@ import define from "@/server/api/define.js";
 import { ApiError } from "@/server/api/error.js";
 import { AuthSessions, AccessTokens, Apps } from "@/models/index.js";
 import { genId } from "@/misc/gen-id.js";
-import { secureRndstr } from "@/misc/secure-rndstr.js";
+import { genString } from "native-utils/built/index.js";
 
 export const meta = {
 	tags: ["auth"],
@@ -38,10 +38,10 @@ export default define(meta, paramDef, async (ps, user) => {
 	}
 
 	// Generate access token
-	const accessToken = secureRndstr(32, true);
+	const accessToken = genString(32);
 
 	// Fetch exist access token
-	const exist = await AccessTokens.exist({
+	const exist = await AccessTokens.exists({
 		where: {
 			appId: session.appId,
 			userId: user.id,
diff --git a/packages/backend/src/server/api/endpoints/miauth/gen-token.ts b/packages/backend/src/server/api/endpoints/miauth/gen-token.ts
index bca09d3f..a673b6dc 100644
--- a/packages/backend/src/server/api/endpoints/miauth/gen-token.ts
+++ b/packages/backend/src/server/api/endpoints/miauth/gen-token.ts
@@ -1,7 +1,7 @@
 import define from "@/server/api/define.js";
 import { AccessTokens } from "@/models/index.js";
 import { genId } from "@/misc/gen-id.js";
-import { secureRndstr } from "@/misc/secure-rndstr.js";
+import { genString } from "native-utils/built/index.js";
 
 export const meta = {
 	tags: ["auth"],
@@ -44,7 +44,7 @@ export const paramDef = {
 
 export default define(meta, paramDef, async (ps, user) => {
 	// Generate access token
-	const accessToken = secureRndstr(32, true);
+	const accessToken = genString(32);
 
 	const now = new Date();