Query Endpoints

Query Endpoints Overview

At its core, query endpoints is about doing one thing well in Redux. Once you understand the pattern, you can apply it consistently across projects and teams.

Good query endpoints pays off across the whole project: fewer surprises, easier collaboration, and smoother onboarding. The snippet below is a solid starting point.

import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react';

export const api = createApi({
  reducerPath: 'api',
  baseQuery: fetchBaseQuery({ baseUrl: '/api' }),
  endpoints: (builder) => ({
    getUsers: builder.query({ query: () => 'users' }),
    addUser: builder.mutation({
      query: (body) => ({ url: 'users', method: 'POST', body }),
    }),
  }),
});

export const { useGetUsersQuery, useAddUserMutation } = api;

RTK Query handles data fetching, caching, and auto-generated React hooks for you.

Query Endpoints Example

const slice = createSlice({ name, initialState, reducers });
const store = configureStore({ reducer: { key: slice.reducer } });
// dispatch(slice.actions.something())

• Start from a minimal Query Endpoints example and grow it only as needed.
• Keep things explicit so Query Endpoints behaves the same for everyone on the team.
• Name things clearly so teammates understand your Query Endpoints at a glance.
• Verify Query Endpoints works as expected before relying on it in important work.

Redux Cheatsheet

Quick Redux Toolkit reference related to query endpoints.

How Query Endpoints Works in Redux

Query Endpoints follows Redux's predictable data flow: components dispatch actions, reducers compute the next state from the previous state and the action, and subscribed components re-render.

RTK Query handles data fetching, caching, and auto-generated React hooks for you.

• State lives in a single, read-only store.
• Actions are the only way to describe a change.
• Reducers are pure functions that return the next state.
• Redux Toolkit removes most boilerplate with slices and thunks.

Practical Guidance for Query Endpoints

In modern apps, query endpoints should use Redux Toolkit rather than hand-written Redux. Keep state minimal, colocate logic in slices, and use RTK Query for server data.

Common Mistakes

• Copying query endpoints commands or snippets without understanding what each part does.
• Skipping edge cases and error handling when using query endpoints.
• Not verifying the result of query endpoints before moving on.
• Over-complicating query endpoints before you actually need the extra flexibility.

Key Takeaways

• Query Endpoints is a core part of working effectively with Redux.
• Start small and keep query endpoints focused on a single goal.
• Apply consistent patterns so query endpoints scales across your project.
• Practise and document query endpoints to keep your workflow maintainable.