reduxjs/reselect

What is it?

Key features

• 01Creates memoized selectors that skip recalculation when inputs are unchanged.
• 02Lets selectors be composed by using other selectors as inputs.
• 03Returns stable result references, which helps React-Redux and React avoid unnecessary re-renders.
• 04Offers createStructuredSelector for building selectors from an object of selectors.
• 05Supports custom memoization via createSelectorCreator, lruMemoize, and weakMapMemoize.
• 06Includes development-only checks for unstable input selectors and identity result functions.

Use cases

• Deriving filtered or aggregated data from Redux state without storing it redundantly.
• Feeding props to React components through React-Redux while avoiding unnecessary re-renders.
• Building layered selectors that compose small state queries into larger derived views.
• Applying memoized derived state to any plain JavaScript immutable data outside Redux.

Quick start

1. 1

   Install the standalone package with npm

   npm install reselect
2. 2

   Or use the Redux Toolkit, which already includes Reselect (no extra install needed)

Topics

FAQ

What is reselect?

A TypeScript library for creating memoized selector functions that derive data from Redux or other plain JavaScript state. Reselect provides createSelector, which builds memoized "selector" functions. You pass it one or more input selectors that pull values out of state, and a result function that computes a derived value from them. The output selector only recalculates when those extracted values change, and it returns the same reference when nothing has changed.

Is reselect free to use? What license does it have?

reselect is open source under the MIT license. Check the license terms before using it in commercial products.

Is reselect still maintained?

Actively maintained. The last commit to reselect was on Oct 21, 2026.

What can I use reselect for?

Deriving filtered or aggregated data from Redux state without storing it redundantly. Feeding props to React components through React-Redux while avoiding unnecessary re-renders. Building layered selectors that compose small state queries into larger derived views. Applying memoized derived state to any plain JavaScript immutable data outside Redux.

How do I install reselect?

Install the standalone package with npm: npm install reselect Or use the Redux Toolkit, which already includes Reselect (no extra install needed)

Where can I get reselect?

The source code and installation instructions are on GitHub: https://github.com/reduxjs/reselect