What is RTK Query and why was it introduced?

Difficulty: 5/10

data fetching, caching, Redux Toolkit integration

RTK Query is a powerful data fetching and caching tool built into Redux Toolkit. It was introduced to simplify the process of managing server state — including fetching, caching, updating, and synchronizing data between a client and an API — while reducing the amount of boilerplate code typically required with Redux.

Why RTK Query Was Introduced

1
To eliminate repetitive boilerplate code for async data fetching and state management.
2
To provide built-in caching, invalidation, and automatic re-fetching of API data.
3
To improve performance by avoiding unnecessary network requests and re-renders.
4
To make integrating APIs with Redux applications faster, easier, and more consistent.

Example: Simple RTK Query Setup

RTK Query automates the complexities of API calls and state synchronization, allowing developers to focus on building features rather than managing network logic manually.

Scenario Questions

0-2 years experience

2-5 years experience

1Your feature needs optimistic updates for a POST request; walk me through how you'd configure RTK Query to handle that and what trade‑offs you consider.

Follow-up Questions