> ## Documentation Index
> Fetch the complete documentation index at: https://v0.x-docs.novu.co/llms.txt
> Use this file to discover all available pages before exploring further.

# API Overview

> In this page you can learn about how to work with Novu's API

<Note>
  It's important to note that our API and backend SDK are intended for use
  exclusively in server-side applications. **Attempting to use them in a
  client-side application will result in Cross-Origin Resource Sharing (CORS)
  errors.** This restriction ensures the security and integrity of our services.
</Note>

## Authentication

Authentication for the Novu API involves the use of an API Key, which is a secure credential that is tied to your Novu account. This key should be included in the header of the request in the Authorization field as a string prefixed with 'ApiKey '.

```curl theme={null}
--header 'Authorization: ApiKey <NOVU_API_KEY>'
```

For example, when using Novu in a Node.js application, the Novu package should be imported and initialized with the API key, as shown in this snippet:

```javascript theme={null}
import { Novu } from "@novu/node";
const novu = new Novu("<NOVU_API_KEY>");
```

Replace `<NOVU_API_KEY>` with your actual API Key, available in the API Key section of the Novu Dashboard.

<Warning>
  It is advised not to hardcode your credentials in a file in production
  environments. Use environment variables instead.
</Warning>

## API Endpoints

Novu provides a multitude of API endpoints that enable a variety of functionalities.
the base URL for the Novu API is `https://api.novu.co/v1`.

<Note>
  We offer two API options: the US API and the EU API. By default, our API documentation refers to the US API, which can be accessed at: [https://api.novu.co/v1](https://api.novu.co/v1).

  If you require the EU version, you can access it here: [https://eu.api.novu.co/v1](https://eu.api.novu.co/v1).
</Note>

For instance, to get tenant information, the endpoint to use would include the tenant's identifier and look like this `https://api.novu.co/v1/tenants/{identifier}`.