What are endpoints in RTK Query?

Q: What are endpoints in RTK Query?

In RTK Query, **endpoints** define the operations your application can perform with an API — such as fetching, creating, updating, or deleting data. Each endpoint describes how a specific request should be made and how RTK Query should cache or update the response. **Query endpoints**: Used for fetching and reading data from an API. Defined using `builder.query()`. **Mutation endpoints**: Used for creating, updating, or deleting data. Defined using `builder.mutation()`. Define the API routes and request configurations for each operation. Automatically generate React hooks like `useGetUsersQuery` or `useAddUserMutation`. Control caching, invalidation, and refetching behavior for specific data sets. Allow strong typing and automatic inference when using TypeScript. import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react'; export const userApi = createApi({ reducerPath: 'userApi', baseQuery: fetchBaseQuery({ baseUrl: '/api' }), endpoints: (builder) => ({ getUsers: builder.query({ query: () => 'users' }), // Query endpoint addUser: builder.mutation({ query: (newUser) => ({ url: 'users', method: 'POST', body: newUser, }), }), // Mutation endpoint }), }); export const { useGetUsersQuery, useAddUserMutation } = userApi; Endpoints are the core building blocks of RTK Query APIs, defining how your application interacts with backend services in a clean, declarative way.

Difficulty: 5/10

endpoint definition, auto-generated hooks, cache invalidation

In RTK Query, endpoints define the operations your application can perform with an API — such as fetching, creating, updating, or deleting data. Each endpoint describes how a specific request should be made and how RTK Query should cache or update the response.

Types of Endpoints

1
Query endpoints: Used for fetching and reading data from an API. Defined using builder.query().
2
Mutation endpoints: Used for creating, updating, or deleting data. Defined using builder.mutation().

Purpose of Endpoints

1
Define the API routes and request configurations for each operation.
2
Automatically generate React hooks like useGetUsersQuery or useAddUserMutation.
3
Control caching, invalidation, and refetching behavior for specific data sets.
4
Allow strong typing and automatic inference when using TypeScript.

Example: Defining Endpoints in createApi()

Endpoints are the core building blocks of RTK Query APIs, defining how your application interacts with backend services in a clean, declarative way.

Scenario Questions

0-2 years experience

2-5 years experience

Follow-up Questions