# Configuration JSON download/upload

All YuDash IoT devices are configured using a single JSON configuration file (typically called **`lynx.json).`**This file defines everything about the device — from sensor inputs, logic formulas, and network settings, to output behavior and communication protocols.

Think of `lynx.json` as the **"PLC program"** for your YuDash device. You can either:

* Edit settings using the **built-in web UI**, or
* Modify the `lynx.json` file directly for advanced customization.

> ✅ Once your configuration is stable and tested, it is **good practice to download the current `lynx.json` file**. This serves as a backup and can be reused for future deployments.

### YuDash Configuration JSON file download

{% embed url="<https://youtu.be/rYdnaPNauaY>" %}

### YuDash Configuration JSON file upload

{% embed url="<https://youtu.be/UN_CmP_vjeg>" %}


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# 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://docs.yudash.com/dc/dc1/json.md?ask=<question>
```

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.