# Overview
This JavaScript library provides an intuitive, easy-to-use interface for interacting with the Ubidots API. It lets you send data to devices and perform CRUD (create, read, update, and delete) operations on the library's [supported entities](#supported-entities).
## Features
* Predefined requests to the Ubidots API through the library's [methods](/sdks/javascript/ubidots-class/get-methods.md).
* Custom request building using [Ubidots field filters](https://docs.ubidots.com/reference/field-filters) through [filter methods](/sdks/javascript/ubidots-class/filter-methods.md).
* Custom API host configuration through the `setBaseUrl` method.
## Supported entities
Currently, the library supports the following API entities:
* [Devices](https://docs.ubidots.com/reference/device-object)
* [Variables](https://docs.ubidots.com/reference/variable-object)
* [Organizations](https://docs.ubidots.com/reference/organization-object)
* [Users](https://docs.ubidots.com/reference/user-object)
* [Dashboards](https://docs.ubidots.com/reference/dashboard-object)
## Supported field filters
The library supports all of Ubidots [field filters](https://docs.ubidots.com/reference/field-filters) on each entity mentioned above.
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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://dev.ubidots.com/sdks/javascript/overview.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.