diff --git a/packages/api-client/src/core/client.ts b/packages/api-client/src/core/client.ts
index 94182169..70ac9d72 100644
--- a/packages/api-client/src/core/client.ts
+++ b/packages/api-client/src/core/client.ts
@@ -2,7 +2,26 @@ export class APIClient {
   constructor(private readonly baseUrl: string) {}
 
   async request(url: string, options: RequestInit): Promise<Response> {
-    return await fetch(`${this.baseUrl}${url}`, options)
+    const response = await fetch(`${this.baseUrl}${url}`, options);
+
+    if (response.status === 403) {
+      // Clear local data and cookies
+      if (typeof localStorage !== 'undefined') {
+        localStorage.clear();
+      }
+      if (typeof document !== 'undefined' && typeof document.cookie !== 'undefined') {
+        document.cookie.split(";").forEach((cookie) => {
+          const name = cookie.split("=")[0].trim();
+          document.cookie = `${name}=;expires=Thu, 01 Jan 1970 00:00:00 UTC;path=/`;
+        });
+      }
+
+      // Redirect to /auth
+      window.location.href = "/auth";
+      return Promise.reject(new Error("User is not authenticated. Redirecting to /auth."));
+    }
+
+    return response;
   }
 
   /**
diff --git a/packages/api-client/tests/api-client.spec.ts b/packages/api-client/tests/api-client.spec.ts
new file mode 100644
index 00000000..ef35316f
--- /dev/null
+++ b/packages/api-client/tests/api-client.spec.ts
@@ -0,0 +1,68 @@
+import { APIClient } from "../src/APIClient";
+import { rest } from "msw";
+import { setupServer } from "msw/node";
+
+const backendUrl = process.env.BACKEND_URL
+const apiClient = new APIClient(backendUrl);
+
+// Mock server for API requests
+const server = setupServer(
+  rest.get(`${backendUrl}/test`, (req, res, ctx) => {
+    return res(ctx.status(200), ctx.json({ message: "Success" }));
+  }),
+  rest.get(`${backendUrl}/auth-required`, (req, res, ctx) => {
+    return res(ctx.status(403), ctx.json({ message: "Forbidden" }));
+  })
+);
+
+beforeAll(() => server.listen());
+afterEach(() => server.resetHandlers());
+afterAll(() => server.close());
+
+describe("APIClient", () => {
+  beforeEach(() => {
+    localStorage.clear();
+    document.cookie = "";
+  });
+
+  it("should fetch data successfully", async () => {
+    const response = await apiClient.get("/test");
+    const data = await response.json();
+
+    expect(response.status).toBe(200);
+    expect(data.message).toBe("Success");
+  });
+
+  it("should clear local data and redirect on 403 Forbidden", async () => {
+    // Mock window.location.href
+    delete (window as any).location;
+    (window as any).location = { href: "" };
+
+    await expect(apiClient.get("/auth-required")).rejects.toThrow(
+      "User is not authenticated. Redirecting to /auth."
+    );
+
+    // Verify localStorage is cleared
+    expect(localStorage.length).toBe(0);
+
+    // Verify cookies are cleared
+    expect(document.cookie).toBe("");
+
+    // Verify redirection
+    expect(window.location.href).toBe("/auth");
+  });
+
+  it("should handle other HTTP errors gracefully", async () => {
+    server.use(
+      rest.get(`${baseUrl}/error`, (req, res, ctx) => {
+        return res(ctx.status(500), ctx.json({ message: "Server Error" }));
+      })
+    );
+
+    const response = await apiClient.get("/error");
+    expect(response.status).toBe(500);
+
+    const data = await response.json();
+    expect(data.message).toBe("Server Error");
+  });
+});