RTK Query

RTK Query is a powerful data-fetching and caching tool built into Redux Toolkit that streamlines how you interact with APIs in your React apps. Here’s a breakdown tailored to your programming style:

🚀 What RTK Query Does

• Simplifies API calls: No more writing reducers, action creators, or thunk logic manually.
• Auto-generates hooks: You get custom React hooks like useGetPostsQuery or useAddPostMutation for each endpoint.
• Handles caching: Automatically caches responses and manages cache invalidation.
• Tracks loading & error states: Built-in support for isLoading, isError, etc., right in your components.

🧠 Core Concepts

• createApi(): The heart of RTK Query. You define your API slice here.
• fetchBaseQuery(): A lightweight wrapper around fetch for making requests.
• Endpoints: Define queries (GET) and mutations (POST, PUT, DELETE) with builder functions.
• TransformResponse: Customize how data is shaped before it hits your components.

🛠️ Example Setup

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

export const apiSlice = createApi({
  reducerPath: 'api',
  baseQuery: fetchBaseQuery({ baseUrl: '/api' }),
  endpoints: (builder) => ({
    getPosts: builder.query<Post[], void>({
      query: () => '/posts',
    }),
    addPost: builder.mutation<Post, Partial<Post>>({
      query: (newPost) => ({
        url: '/posts',
        method: 'POST',
        body: newPost,
      }),
    }),
  }),
});

export const { useGetPostsQuery, useAddPostMutation } = apiSlice;

🧩 Advanced Features

• Optimistic updates: Update UI before server confirms.
• Streaming updates: Handle real-time data changes.
• Tag-based cache invalidation: Fine-grained control over when data should refetch.

RTK Query is especially handy for scalable apps with complex data flows—something you’re clearly building toward.