RTK Query with Next.js App Router?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of Next.js conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
RTK Query is a powerful data fetching and caching tool built on top of Redux Toolkit. You can use RTK Query in a Next.js App Router application to manage server state and interact with APIs efficiently.
Here's how to set up RTK Query in a Next.js App Router project:
- Install Redux Toolkit and RTK Query:
npm install @reduxjs/toolkit react-redux
- Create an API slice:
// app/store/apiSlice.js
import { createApi, fetchBaseQuery } from "@reduxjs/toolkit/query/react";
export const apiSlice = createApi({
reducerPath: "api",
baseQuery: fetchBaseQuery({ baseUrl: "/api" }),
endpoints: (builder) => ({
getUsers: builder.query({
query: () => "users",
}),
}),
});
export const { useGetUsersQuery } = apiSlice;
- Set up the Redux store:
// app/store/store.js
import { configureStore } from "@reduxjs/toolkit";
import { apiSlice } from "./apiSlice";
export const store = configureStore({
reducer: {
[apiSlice.reducerPath]: apiSlice.reducer,
},
middleware: (getDefaultMiddleware) =>
getDefaultMiddleware().concat(apiSlice.middleware),
});
- Wrap your application with the Redux Provider:
// app/layout.js
import { Provider } from "react-redux";
import { store } from "./store/store";
export default function RootLayout({ children }) {
return (
<html lang="en">
<body>
<Provider store={store}>{children}</Provider>
</body>
</html>
);
}
- Use RTK Query hooks in your components:
// app/page.js
import { useGetUsersQuery } from "./store/apiSlice";
export default function HomePage() {
const { data: users, error, isLoading } = useGetUsersQuery();
if (isLoading) return <div>Loading...</div>;
if (error) return <div>Error loading users</div>;
return (
<div>
<h1>User List</h1>
<ul>
{users.map((user) => (
<li key={user.id}>{user.name}</li>
))}
</ul>
</div>
);
}
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.