diff --git a/packages/core/src/routes/application.test.ts b/packages/core/src/routes/application.test.ts
index 1aaf6d2b2..6fc0364ec 100644
--- a/packages/core/src/routes/application.test.ts
+++ b/packages/core/src/routes/application.test.ts
@@ -169,6 +169,7 @@ describe('application route', () => {
             'http://127.0.0.1',
             'http://localhost:3002',
           ],
+          postLogoutRedirectUris: [],
         },
       })
     ).resolves.toHaveProperty('status', 200);
@@ -179,6 +180,7 @@ describe('application route', () => {
       applicationRequest.patch('/applications/foo').send({
         oidcClientMetadata: {
           redirectUris: ['www.example.com', 'com.example://callback'],
+          postLogoutRedirectUris: [],
         },
       })
     ).resolves.toHaveProperty('status', 400);
@@ -194,6 +196,7 @@ describe('application route', () => {
             'com.example://callback',
             'io.logto://Abc123',
           ],
+          postLogoutRedirectUris: [],
         },
       })
     ).resolves.toHaveProperty('status', 200);
@@ -205,6 +208,7 @@ describe('application route', () => {
         type: ApplicationType.Native,
         oidcClientMetadata: {
           redirectUris: ['https://www.example.com', 'com.example/callback'],
+          postLogoutRedirectUris: [],
         },
       })
     ).resolves.toHaveProperty('status', 400);
diff --git a/packages/core/src/routes/application.ts b/packages/core/src/routes/application.ts
index 403067956..12f5f8ece 100644
--- a/packages/core/src/routes/application.ts
+++ b/packages/core/src/routes/application.ts
@@ -35,20 +35,25 @@ export default function applicationRoutes<T extends AuthedRouter>(
     queries.applicationsRoles;
   const { findRoleByRoleName } = queries.roles;
 
-  router.get('/applications', koaPagination(), async (ctx, next) => {
-    const { limit, offset } = ctx.pagination;
+  router.get(
+    '/applications',
+    koaPagination(),
+    koaGuard({ response: z.array(Applications.guard), status: 200 }),
+    async (ctx, next) => {
+      const { limit, offset } = ctx.pagination;
 
-    const [{ count }, applications] = await Promise.all([
-      findTotalNumberOfApplications(),
-      findAllApplications(limit, offset),
-    ]);
+      const [{ count }, applications] = await Promise.all([
+        findTotalNumberOfApplications(),
+        findAllApplications(limit, offset),
+      ]);
 
-    // Return totalCount to pagination middleware
-    ctx.pagination.totalCount = count;
-    ctx.body = applications;
+      // Return totalCount to pagination middleware
+      ctx.pagination.totalCount = count;
+      ctx.body = applications;
 
-    return next();
-  });
+      return next();
+    }
+  );
 
   router.post(
     '/applications',
@@ -57,6 +62,8 @@ export default function applicationRoutes<T extends AuthedRouter>(
         .omit({ id: true, createdAt: true })
         .partial()
         .merge(Applications.createGuard.pick({ name: true, type: true })),
+      response: Applications.guard,
+      status: [200, 422],
     }),
     async (ctx, next) => {
       const { oidcClientMetadata, ...rest } = ctx.guard.body;
@@ -77,6 +84,7 @@ export default function applicationRoutes<T extends AuthedRouter>(
     koaGuard({
       params: object({ id: string().min(1) }),
       response: Applications.guard.merge(z.object({ isAdmin: z.boolean() })),
+      status: [200, 404],
     }),
     async (ctx, next) => {
       const {
@@ -114,6 +122,8 @@ export default function applicationRoutes<T extends AuthedRouter>(
             isAdmin: boolean().optional(),
           })
         ),
+      response: Applications.guard,
+      status: [200, 404, 500],
     }),
     async (ctx, next) => {
       const {
@@ -135,7 +145,11 @@ export default function applicationRoutes<T extends AuthedRouter>(
 
         assertThat(
           internalAdminRole,
-          new RequestError('entity.not_exists', { name: InternalRole.Admin })
+          new RequestError({
+            code: 'entity.not_exists',
+            status: 500,
+            data: { name: InternalRole.Admin },
+          })
         );
 
         if (isAdmin && !usedToBeAdmin) {
@@ -155,7 +169,11 @@ export default function applicationRoutes<T extends AuthedRouter>(
 
   router.delete(
     '/applications/:id',
-    koaGuard({ params: object({ id: string().min(1) }) }),
+    koaGuard({
+      params: object({ id: string().min(1) }),
+      response: z.undefined(),
+      status: [204, 404],
+    }),
     async (ctx, next) => {
       const { id } = ctx.guard.params;
       // Note: will need delete cascade when application is joint with other tables
diff --git a/packages/integration-tests/src/api/application.ts b/packages/integration-tests/src/api/application.ts
index 8778232df..2219a89d7 100644
--- a/packages/integration-tests/src/api/application.ts
+++ b/packages/integration-tests/src/api/application.ts
@@ -17,6 +17,8 @@ export const createApplication = async (name: string, type: ApplicationType) =>
     })
     .json<Application>();
 
+export const getApplications = async () => authedAdminApi.get('applications').json<Application[]>();
+
 export const getApplication = async (applicationId: string) =>
   authedAdminApi.get(`applications/${applicationId}`).json<Application>();
 
diff --git a/packages/integration-tests/src/tests/api/application.test.ts b/packages/integration-tests/src/tests/api/application.test.ts
index 84b0d7e89..84f51eaac 100644
--- a/packages/integration-tests/src/tests/api/application.test.ts
+++ b/packages/integration-tests/src/tests/api/application.test.ts
@@ -6,13 +6,13 @@ import {
   getApplication,
   updateApplication,
   deleteApplication,
+  getApplications,
 } from '#src/api/index.js';
 
 describe('admin console application', () => {
   it('should create application successfully', async () => {
     const applicationName = 'test-create-app';
     const applicationType = ApplicationType.SPA;
-
     const application = await createApplication(applicationName, applicationType);
 
     expect(application.name).toBe(applicationName);
@@ -25,7 +25,7 @@ describe('admin console application', () => {
   });
 
   it('should update application details successfully', async () => {
-    const application = await createApplication('test-update-app', ApplicationType.SPA);
+    const application = await createApplication('test-update-app', ApplicationType.Traditional);
 
     const newApplicationDescription = `new_${application.description ?? ''}`;
 
@@ -46,8 +46,15 @@ describe('admin console application', () => {
     expect(updatedApplication.oidcClientMetadata.redirectUris).toEqual(newRedirectUris);
   });
 
+  it('should fetch all applications created above', async () => {
+    const applications = await getApplications();
+    const applicationNames = applications.map(({ name }) => name);
+    expect(applicationNames).toContain('test-create-app');
+    expect(applicationNames).toContain('test-update-app');
+  });
+
   it('should delete application successfully', async () => {
-    const application = await createApplication('test-delete-app', ApplicationType.SPA);
+    const application = await createApplication('test-delete-app', ApplicationType.Native);
 
     await deleteApplication(application.id);