---
id: index
title: API Documentation
---

## Client API
This describes the API provided to unleash-clients. 

* [Feature Toggles API](client/feature-toggles-api.md)
* [Register API](client/register-api.md)
* [Metrics API](client/metrics-api.md)

## Admin API (internal)
The internal API used by the Admin UI (unleash-frontend):

* [Feature Toggles API](admin/feature-toggles-api.md)
* [Strategies API](admin/strategies-api.md)
* [Events API](admin/events-api.md)
* [Metrics API](admin/metrics-api.md)

## System API's
* [Internal Backstage API](internal-backstage-api.md)