feat: implement robust logout API route to clear all authentication cookies

src/app/api/logout/route.ts

@@ -0,0 +1,45 @@
+import { NextResponse } from 'next/server';
+
+const COOKIE_NAMES = [
+  'authjs.session-token',
+  'authjs.csrf-token',
+  'authjs.callback-url',
+  '__Secure-authjs.session-token',
+  '__Secure-authjs.callback-url',
+  '__Host-authjs.csrf-token',
+  'next-auth.session-token',
+  'next-auth.csrf-token',
+  'next-auth.callback-url',
+  '__Secure-next-auth.session-token',
+  '__Secure-next-auth.callback-url',
+  '__Host-next-auth.csrf-token',
+];
+
+export async function POST() {
+  const response = NextResponse.json({ ok: true });
+
+  for (const name of COOKIE_NAMES) {
+    // Set with secure attributes (production)
+    response.cookies.set({
+      name,
+      value: '',
+      path: '/',
+      maxAge: 0,
+      expires: new Date(0),
+      httpOnly: true,
+      secure: true,
+      sameSite: 'lax',
+    });
+  }
+
+  // Prevent caching of this response
+  response.headers.set('Cache-Control', 'no-store, no-cache, must-revalidate, proxy-revalidate');
+  response.headers.set('Pragma', 'no-cache');
+  response.headers.set('Expires', '0');
+
+  return response;
+}
+
+export async function GET() {
+  return POST();
+}

src/app/logout/page.tsx

@@ -33,15 +33,27 @@ export default function LogoutPage() {
       localStorage.removeItem('refreshToken');
       localStorage.removeItem('user');
 
-      // Call NextAuth signOut — canonical way to clear session cookie
-      // (uses the exact cookie name/attributes from cookies config in auth.ts)
+      // Call NextAuth signOut first (clears session via NextAuth's own logic)
       try {
         await signOut({ redirect: false });
       } catch {
         // Continue even if signOut fails
       }
 
-      // Belt-and-suspenders: server action to nuke any remaining auth cookies
+      // Hit our explicit logout route handler — returns Set-Cookie headers
+      // that nuke ALL auth cookies. Route handlers are more reliable than
+      // server actions for cookie deletion in production.
+      try {
+        await fetch('/api/logout', {
+          method: 'POST',
+          credentials: 'include',
+          cache: 'no-store',
+        });
+      } catch {
+        // Continue
+      }
+
+      // Server action fallback
       try {
         await clearAuthCookies();
       } catch {