---
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)
- [Tags API](admin/tags-api.md)

## System API's

- [Internal Backstage API](internal-backstage-api.md)
