---
title: React SDK prior to v4
slug: feature-experimentation/docs/javascript-react-sdk-prior-to-v4
docTags: 
createdAt: 2026-08-05T20:40:00.000Z
---

## Version

This documentation is for React SDK versions 3.x and earlier.

For the latest React documentation, see [React SDK v4+](docId\:qfwx3wCoS4mwpP0g7nIez).

See the [SDK compatibility matrix](docId:2shbZfPCkPAZ0mlZpL1TU) documentation for a list of current SDK releases and the features they support.

## Reference

For reference documentation, see the left-hand menu, or start off with [Installing the React SDK](docId\:OsNSGFOXKPpeDeiPTai5w).

## Source files

- [React SDK repo on GitHub](https://github.com/optimizely/react-sdk)
- [changelog](https://github.com/optimizely/react-sdk/blob/master/CHANGELOG.md)