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67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
---
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id: proxy-javascript
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title: JavaScript Proxy SDK
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---
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In this guide we explain how to use feature toggles in a Single Page App via [The Unleash Proxy](/sdks/unleash-proxy). You can also checkout the source code for the [JavaScript Proxy SDK](https://github.com/unleash/unleash-proxy-client-js).
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## Introduction {#introduction}
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For single-page apps we have a tiny proxy-client in JavaScript, without any external dependencies, except from browser APIs. This client will store toggles relevant for the current user in local-storage and synchronize with the Unleash Proxy in the background. This means we can bootstrap the toggles for a specific use the next time the user visits the web-page.
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> We are looking in to also [supporting react-native](https://github.com/Unleash/unleash/issues/785) with this SDK. Reach out if you want to help us validate the implementation.
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## How to use the JavaScript Proxy SDK
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**Step 1: Install**
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```
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npm install unleash-proxy-client
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```
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**Step 2: Initialize the SDK**
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You need to have an Unleash-hosted instance, and the proxy needs to be enabled. In addition you will need a proxy-specific `clientKey` in order to connect to the Unleash-hosted Proxy. For more on how to set up client keys, [consult the Unleash Proxy docs](unleash-proxy.md#configuration-variables).
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```js
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import { UnleashClient } from 'unleash-proxy-client';
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const unleash = new UnleashClient({
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url: 'https://eu.unleash-hosted.com/hosted/proxy',
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clientKey: 'your-proxy-key',
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appName: 'my-webapp',
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});
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// Used to set the context fields, shared with the Unleash Proxy
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unleash.updateContext({ userId: '1233' });
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// Start the background polling
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unleash.start();
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```
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**Step 3: Check if feature toggle is enabled**
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```js
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unleash.isEnabled('proxy.demo');
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```
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...or get toggle variant:
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```js
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const variant = unleash.getVariant('proxy.demo');
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if (variant.name === 'blue') {
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// something with variant blue...
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}
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```
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**Listen for updates via the EventEmitter**
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The client is also an event emitter. This means that your code can subscribe to updates from the client. This is a neat way to update a single page app when toggle state updates.
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```js
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unleash.on('update', () => {
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const myToggle = unleash.isEnabled('proxy.demo');
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//do something useful
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});
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```
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