---
title: Optimizely Experimentation REST API Documentation
slug: experimentation-strategy/docs/optimizely-experimentation-rest-api-documentation
docTags: 
createdAt: 2026-08-05T20:33:25.528Z
---

- Optimizely Web Experimentation
- Optimizely Feature Experimentation
- Optimizely Full Stack Experimentation (Legacy)

All Optimizely Experimentation API documentation is in the [developer documentation](https://docs.developers.optimizely.com). 

## Optimizely Web Experimentation

The [Optimizely Web Experimentation API reference documentation](docId:_kK0veAk1eNQdMVbT_Jjf) contains comprehensive instructions, code samples, FAQs, and more on the REST and JavaScript API for Optimizely Web Experimentation.

Use them to learn more about

- integrating Optimizely Web Experimentation with your CMS.
- creating custom audiences and events.
- conditionally activating experiments.
- pulling data into internal reports and more.

## Optimizely Feature Experimentation

:::hint{type="info"}
**Note**

For projects created after February 2021 
:::

See [Optimizely Feature Experimentation API](docId\:lMUQVOETwikoFzp7643EQ) in the developer reference documentation for the API information.

Use the Optimizely Feature Experimentation API to

- manage your flags.
- update variable definitions.
- update variations.
- update your environments.

The Optimizely [Feature Experimentation Agent](docId\:eH-UMm_rOn_GdGDGLV6__) API is under [Optimizely Agent API](docId\:qb3u3WT3ZvjC_yx3j3tHx) in the developer reference documentation.

## Optimizely Full Stack Experimentation (Legacy)

:::hint{type="info"}
**Note**

For legacy projects created before February 2021
:::

The Optimizely Full Stack APIs are under the [legacy version of the developer reference documentation](docId\:L6LJsIHbEu9LfDd8Kt1fT).

The Optimizely API lets you

- create Optimizely Full Stack Experimentation audiences based on information collected from your Data Management Platform.
- manage Optimizely Full Stack Experimentation projects from an internal system.

The Optimizely [Full Stack Agent](docId:6_ik6SSz-WyJLWuCQw7BT) API is under [Optimizely Agent API](docId:-0WpaF25Iv6t7HoLU_9zZ).