# Previolet
[Previolet][home] provides the interface, infrastructure and tools you need to build, manage and grow your application. Featuring a realtime database, powerful authentication and cloud functions, teams also use Previolet to organize their work.
This SDK is intended for end-user client access for Web, mobile Web (e.g. React Native, VueJs, Angular), Node.js desktop or IoT devices.
## Get the code
### NPM bundler
The Previolet JavaScript npm package contains code that can be run in the browser after combining the modules you use with a package bundler.
Install the Previolet npm module:
```
$ npm init
$ npm install --save previolet
```
In your code, you can initialize the SDK using:
```js
var PrevioletSDK = require('previolet').default
var sdk = new PrevioletSDK({
instance: 'cXXXXXXXX',
region: 'eu.west1', // Application region (optional)
tokenFallback: 'tk-XXXXXXXX', // Persistent token (optional)
appVersion: '1.0.0', // Your custom app version (optional)
})
```
### Script include
Include Previolet in your web application via a `
```
[home]: https://previolet.com