---
title: JavaScript (Node) SDK prior to v6
slug: feature-experimentation/docs/javascript-node-sdk-prior-to-v6
docTags: 
createdAt: 2026-08-05T20:39:59.000Z
---

## Version

This documentation is for JavaScript SDK versions 5.3.5 and earlier.

For the latest JavaScript documentation, see [JavaScript SDK](docId:8PWUc59E_yQaRlOmUc5JA).

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

## Quickstart

To get started, see the [JavaScript (Node) Quickstart](docId\:eH-UMm_rOn_GdGDGLV6__).

## Reference

For reference docs, see the left-hand menu, or start by [installing the JavaScript (Node) SDK](docId\:aWlYGdCB88CMVFXhGcI2o).

## Source files

- [JavaScript SDK repository on GitHub](https://github.com/optimizely/javascript-sdk/tree/master)
- [Releases](https://github.com/optimizely/javascript-sdk/releases)