diff --git a/src/app/api/auth/logout/route.test.ts b/src/app/api/auth/logout/route.test.ts
new file mode 100644
index 000000000..c9bcfd8b4
--- /dev/null
+++ b/src/app/api/auth/logout/route.test.ts
@@ -0,0 +1,68 @@
+import { beforeEach, expect, test, vi } from 'vitest';
+import redis from '@/lib/redis';
+import { parseRequest } from '@/lib/request';
+import { POST } from './route';
+
+vi.mock('@/lib/redis', () => ({
+  default: {
+    enabled: true,
+    client: {
+      del: vi.fn(),
+    },
+  },
+}));
+
+vi.mock('@/lib/request', () => ({
+  parseRequest: vi.fn(),
+}));
+
+vi.mock('@/lib/response', () => ({
+  ok: () => new Response(null, { status: 200 }),
+}));
+
+const redisMock = redis as {
+  enabled: boolean;
+  client: {
+    del: ReturnType<typeof vi.fn>;
+  };
+};
+const parseRequestMock = vi.mocked(parseRequest);
+
+beforeEach(() => {
+  redisMock.enabled = true;
+  redisMock.client.del.mockReset();
+  parseRequestMock.mockReset();
+});
+
+test('POST deletes the authenticated Redis auth key', async () => {
+  parseRequestMock.mockResolvedValue({
+    auth: { authKey: 'auth:session-key' },
+    error: undefined,
+  });
+
+  const response = await POST(
+    new Request('http://localhost/api/auth/logout', {
+      method: 'POST',
+      headers: {
+        authorization: 'Bearer secure-token',
+      },
+    }),
+  );
+
+  expect(redisMock.client.del).toHaveBeenCalledTimes(1);
+  expect(redisMock.client.del).toHaveBeenCalledWith('auth:session-key');
+  expect(redisMock.client.del).not.toHaveBeenCalledWith('secure-token');
+  expect(response.status).toBe(200);
+});
+
+test('POST does not delete a key when auth fails', async () => {
+  parseRequestMock.mockResolvedValue({
+    auth: null,
+    error: () => new Response(null, { status: 401 }),
+  });
+
+  const response = await POST(new Request('http://localhost/api/auth/logout', { method: 'POST' }));
+
+  expect(redisMock.client.del).not.toHaveBeenCalled();
+  expect(response.status).toBe(401);
+});
diff --git a/src/app/api/auth/logout/route.ts b/src/app/api/auth/logout/route.ts
index 153f1f523..5e593dde7 100644
--- a/src/app/api/auth/logout/route.ts
+++ b/src/app/api/auth/logout/route.ts
@@ -3,16 +3,14 @@ import { parseRequest } from '@/lib/request';
 import { ok } from '@/lib/response';
 
 export async function POST(request: Request) {
-  const { error } = await parseRequest(request);
+  const { auth, error } = await parseRequest(request);
 
   if (error) {
     return error();
   }
 
-  if (redis.enabled) {
-    const token = request.headers.get('authorization')?.split(' ')?.[1];
-
-    await redis.client.del(token);
+  if (redis.enabled && auth?.authKey) {
+    await redis.client.del(auth.authKey);
   }
 
   return ok();