# API Playground
Eagle includes a built-in interactive API playground that lets you test all API endpoints without writing any code. Open it in your browser:
```
http://localhost:41595/api/v2/playground
```
Key features of the playground:
* **Live testing** — Send real API requests against your current Eagle library and see responses instantly
* **GUI parameter input** — Select and fill in parameters through a visual form, no need to manually craft JSON
* **Code snippets** — Each operation automatically generates a JavaScript `fetch` code snippet you can copy and use directly
* **Full endpoint list** — The left sidebar lists all available API endpoints, organized by category
{% hint style="info" %}
The playground operates on your actual library data. Write operations (add, update, delete) will modify your data for real — use with care.
{% endhint %}
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://developer.eagle.cool/web-api/get-started/playground.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.