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<a href="../.." >WsProvider</a>
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<p>The WebSocket Provider allows sending requests using WebSocket. Unlike the <a href="_http_index_.httpprovider.html">HttpProvider</a>, it does support subscriptions and allows listening to events such as new blocks or balance changes.
<em><strong>example</strong></em>: import createApi from &apos;@polkadot/api&apos;; import WsProvider from &apos;@polkadot/api-provider/ws&apos;; const provider = new WsProvider(&apos;ws://127.0.0.1:9944&apos;); const api = createApi(provider);</p>
<p><em><strong>see</strong></em>: <a href="_http_index_.httpprovider.html">HttpProvider</a></p>
<h1 id="type-parameters">Type parameters</h1>
<h4 id="eventtypes----string--symbol">EventTypes : <code>string</code> | <code>symbol</code></h4>
<h1 id="hierarchy">Hierarchy</h1>
<p> <code>EventEmitter</code></p>
<p><strong>&#x21B3; WsProvider</strong></p>
<h1 id="implements">Implements</h1>
<ul>
<li><code>WSProviderInterface</code></li>
</ul>
<h1 id="constructors">Constructors</h1>
<p><a id="constructor"></a></p>
<h2 id="constructor">constructor</h2>
<p>&#x2295; <strong>new WsProvider</strong>(endpoint: <em><code>string</code></em>, autoConnect?: <em><code>boolean</code></em>): <a href="_ws_index_.wsprovider.html">WsProvider</a></p>
<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/522eae6/packages/api-provider/src/ws/index.ts#L67" target="_blank">ws/index.ts:67</a></em></p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
<th>Default value</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>endpoint</td>
<td><code>string</code></td>
<td>-</td>
<td>The endpoint url. Usually `ws://ip:9944` or `wss://ip:9944`</td>
</tr>
<tr>
<td><code>Default value</code> autoConnect</td>
<td><code>boolean</code></td>
<td>true</td>
<td>Whether to connect automatically or not.</td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <a href="_ws_index_.wsprovider.html">WsProvider</a></p>
<hr>
<h1 id="properties">Properties</h1>
<p><a id="prefixed"></a></p>
<h2 id="static-prefixed"><code>&lt;Static&gt;</code> prefixed</h2>
<p><strong>&#x25CF; prefixed</strong>: <em> <code>string</code> | <code>boolean</code>
</em></p>
<p><em>Inherited from EventEmitter.prefixed</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:6</em></p>
<hr>
<h1 id="methods">Methods</h1>
<p><a id="addlistener"></a></p>
<h2 id="addlistener">addListener</h2>
<p>&#x25B8; <strong>addListener</strong>(event: <em><code>EventTypes</code></em>, fn: <em><code>ListenerFn</code></em>, context?: <em><code>any</code></em>): <code>this</code></p>
<p><em>Inherited from EventEmitter.addListener</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:33</em></p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>event</td>
<td><code>EventTypes</code></td>
</tr>
<tr>
<td>fn</td>
<td><code>ListenerFn</code></td>
</tr>
<tr>
<td><code>Optional</code> context</td>
<td><code>any</code></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>this</code></p>
<hr>
<p><a id="connect"></a></p>
<h2 id="connect">connect</h2>
<p>&#x25B8; <strong>connect</strong>(): <code>void</code></p>
<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/522eae6/packages/api-provider/src/ws/index.ts#L97" target="_blank">ws/index.ts:97</a></em></p>
<p>The <a href="_ws_index_.wsprovider.html">WsProvider</a> connects automatically by default. if you decided otherwise, you may connect manually using this method.</p>
<p><strong>Returns:</strong> <code>void</code></p>
<hr>
<p><a id="emit"></a></p>
<h2 id="emit">emit</h2>
<p>&#x25B8; <strong>emit</strong>(event: <em><code>EventTypes</code></em>, ...args: <em><code>Array</code>&lt;<code>any</code>&gt;</em>): <code>boolean</code></p>
<p><em>Inherited from EventEmitter.emit</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:27</em></p>
<p>Calls each of the listeners registered for a given event.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>event</td>
<td><code>EventTypes</code></td>
</tr>
<tr>
<td><code>Rest</code> args</td>
<td><code>Array</code>&lt;<code>any</code>&gt;</td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>boolean</code></p>
<hr>
<p><a id="eventnames"></a></p>
<h2 id="eventnames">eventNames</h2>
<p>&#x25B8; <strong>eventNames</strong>(): <code>Array</code>&lt;<code>EventTypes</code>&gt;</p>
<p><em>Inherited from EventEmitter.eventNames</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:12</em></p>
<p>Return an array listing the events for which the emitter has registered listeners.</p>
<p><strong>Returns:</strong> <code>Array</code>&lt;<code>EventTypes</code>&gt;</p>
<hr>
<p><a id="isconnected"></a></p>
<h2 id="isconnected">isConnected</h2>
<p>&#x25B8; <strong>isConnected</strong>(): <code>boolean</code></p>
<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/522eae6/packages/api-provider/src/ws/index.ts#L114" target="_blank">ws/index.ts:114</a></em></p>
<p>Whether the node is connected or not.</p>
<p><strong>Returns:</strong> <code>boolean</code>
true if connected</p>
<hr>
<p><a id="listenercount"></a></p>
<h2 id="listenercount">listenerCount</h2>
<p>&#x25B8; <strong>listenerCount</strong>(event: <em><code>EventTypes</code></em>): <code>number</code></p>
<p><em>Inherited from EventEmitter.listenerCount</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:22</em></p>
<p>Return the number of listeners listening to a given event.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>event</td>
<td><code>EventTypes</code></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>number</code></p>
<hr>
<p><a id="listeners"></a></p>
<h2 id="listeners">listeners</h2>
<p>&#x25B8; <strong>listeners</strong>(event: <em><code>EventTypes</code></em>): <code>Array</code>&lt;<code>ListenerFn</code>&gt;</p>
<p><em>Inherited from EventEmitter.listeners</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:17</em></p>
<p>Return the listeners registered for a given event.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>event</td>
<td><code>EventTypes</code></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>Array</code>&lt;<code>ListenerFn</code>&gt;</p>
<hr>
<p><a id="off"></a></p>
<h2 id="off">off</h2>
<p>&#x25B8; <strong>off</strong>(event: <em><code>EventTypes</code></em>, fn?: <em><a href="../interfaces/_ws_index_.wsprovider.eventemitter.listenerfn.md">ListenerFn</a></em>, context?: <em><code>any</code></em>, once?: <em> <code>undefined</code> | <code>false</code> | <code>true</code></em>): <code>this</code></p>
<p><em>Inherited from EventEmitter.off</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:44</em></p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>event</td>
<td><code>EventTypes</code></td>
</tr>
<tr>
<td><code>Optional</code> fn</td>
<td><a href="../interfaces/_ws_index_.wsprovider.eventemitter.listenerfn.md">ListenerFn</a></td>
</tr>
<tr>
<td><code>Optional</code> context</td>
<td><code>any</code></td>
</tr>
<tr>
<td><code>Optional</code> once</td>
<td><code>undefined</code> | <code>false</code> | <code>true</code></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>this</code></p>
<hr>
<p><a id="on"></a></p>
<h2 id="on">on</h2>
<p>&#x25B8; <strong>on</strong>(type: <em><a href="../modules/_types_d_.md#providerinterface_emitted">ProviderInterface$Emitted</a></em>, sub: <em><a href="../modules/_types_d_.md#providerinterface_emitcb">ProviderInterface$EmitCb</a></em>): <code>this</code></p>
<p><em>Overrides EventEmitter.on</em></p>
<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/522eae6/packages/api-provider/src/ws/index.ts#L124" target="_blank">ws/index.ts:124</a></em></p>
<p>Listens on events after having subscribed using the <a href="_ws_index_.wsprovider.html#subscribe">subscribe</a> function.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td><a href="../modules/_types_d_.md#providerinterface_emitted">ProviderInterface$Emitted</a></td>
<td>Event</td>
</tr>
<tr>
<td>sub</td>
<td><a href="../modules/_types_d_.md#providerinterface_emitcb">ProviderInterface$EmitCb</a></td>
<td>Callback</td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>this</code>
[description]</p>
<hr>
<p><a id="once"></a></p>
<h2 id="once">once</h2>
<p>&#x25B8; <strong>once</strong>(event: <em><code>EventTypes</code></em>, fn: <em><code>ListenerFn</code></em>, context?: <em><code>any</code></em>): <code>this</code></p>
<p><em>Inherited from EventEmitter.once</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:38</em></p>
<p>Add a one-time listener for a given event.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>event</td>
<td><code>EventTypes</code></td>
</tr>
<tr>
<td>fn</td>
<td><code>ListenerFn</code></td>
</tr>
<tr>
<td><code>Optional</code> context</td>
<td><code>any</code></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>this</code></p>
<hr>
<p><a id="removealllisteners"></a></p>
<h2 id="removealllisteners">removeAllListeners</h2>
<p>&#x25B8; <strong>removeAllListeners</strong>(event?: <em><a href="">EventTypes</a></em>): <code>this</code></p>
<p><em>Inherited from EventEmitter.removeAllListeners</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:49</em></p>
<p>Remove all listeners, or those of the specified event.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>Optional</code> event</td>
<td><a href="">EventTypes</a></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>this</code></p>
<hr>
<p><a id="removelistener"></a></p>
<h2 id="removelistener">removeListener</h2>
<p>&#x25B8; <strong>removeListener</strong>(event: <em><code>EventTypes</code></em>, fn?: <em><a href="../interfaces/_ws_index_.wsprovider.eventemitter.listenerfn.md">ListenerFn</a></em>, context?: <em><code>any</code></em>, once?: <em> <code>undefined</code> | <code>false</code> | <code>true</code></em>): <code>this</code></p>
<p><em>Inherited from EventEmitter.removeListener</em></p>
<p><em>Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:43</em></p>
<p>Remove the listeners of a given event.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>event</td>
<td><code>EventTypes</code></td>
</tr>
<tr>
<td><code>Optional</code> fn</td>
<td><a href="../interfaces/_ws_index_.wsprovider.eventemitter.listenerfn.md">ListenerFn</a></td>
</tr>
<tr>
<td><code>Optional</code> context</td>
<td><code>any</code></td>
</tr>
<tr>
<td><code>Optional</code> once</td>
<td><code>undefined</code> | <code>false</code> | <code>true</code></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>this</code></p>
<hr>
<p><a id="send"></a></p>
<h2 id="send">send</h2>
<p>&#x25B8; <strong>send</strong>(method: <em><code>string</code></em>, params: <em><code>Array</code>&lt;<code>any</code>&gt;</em>, subscription?: <em><code>SubscriptionHandler</code></em>): <code>Promise</code>&lt;<code>any</code>&gt;</p>
<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/522eae6/packages/api-provider/src/ws/index.ts#L128" target="_blank">ws/index.ts:128</a></em></p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>method</td>
<td><code>string</code></td>
</tr>
<tr>
<td>params</td>
<td><code>Array</code>&lt;<code>any</code>&gt;</td>
</tr>
<tr>
<td><code>Optional</code> subscription</td>
<td><code>SubscriptionHandler</code></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>Promise</code>&lt;<code>any</code>&gt;</p>
<hr>
<p><a id="subscribe"></a></p>
<h2 id="subscribe">subscribe</h2>
<p>&#x25B8; <strong>subscribe</strong>(type: <em><code>string</code></em>, method: <em><code>string</code></em>, params: <em><code>Array</code>&lt;<code>any</code>&gt;</em>, callback: <em><a href="../modules/_types_d_.md#providerinterface_callback">ProviderInterface$Callback</a></em>): <code>Promise</code>&lt;<code>number</code>&gt;</p>
<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/522eae6/packages/api-provider/src/ws/index.ts#L179" target="_blank">ws/index.ts:179</a></em></p>
<p>Allows subscribing to a specific event.
<em><strong>example</strong></em>: const provider = new WsProvider(&apos;ws://127.0.0.1:9944&apos;); const api = createApi(provider);</p>
<p>api.state.storage([[storage.balances.freeBalance,</p>
<p>]], (_, values) =&gt; { console.log(values) }).then((subscriptionId) =&gt; { console.log(&apos;balance changes subscription id: &apos;, subscriptionId) })</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td><code>string</code></td>
<td>Subscription type</td>
</tr>
<tr>
<td>method</td>
<td><code>string</code></td>
<td>Subscription method</td>
</tr>
<tr>
<td>params</td>
<td><code>Array</code>&lt;<code>any</code>&gt;</td>
<td>Parameters</td>
</tr>
<tr>
<td>callback</td>
<td><a href="../modules/_types_d_.md#providerinterface_callback">ProviderInterface$Callback</a></td>
<td>Callback</td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>Promise</code>&lt;<code>number</code>&gt;
Promise resolving to the dd of the subscription you can use with [[unsubscribe]].</p>
<hr>
<p><a id="unsubscribe"></a></p>
<h2 id="unsubscribe">unsubscribe</h2>
<p>&#x25B8; <strong>unsubscribe</strong>(type: <em><code>string</code></em>, method: <em><code>string</code></em>, id: <em><code>number</code></em>): <code>Promise</code>&lt;<code>boolean</code>&gt;</p>
<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/522eae6/packages/api-provider/src/ws/index.ts#L188" target="_blank">ws/index.ts:188</a></em></p>
<p>Allows unsubscribing to subscriptions made with <a href="_ws_index_.wsprovider.html#subscribe">subscribe</a>.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr>
<th>Param</th>
<th>Type</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td><code>string</code></td>
</tr>
<tr>
<td>method</td>
<td><code>string</code></td>
</tr>
<tr>
<td>id</td>
<td><code>number</code></td>
</tr>
</tbody>
</table>
<p><strong>Returns:</strong> <code>Promise</code>&lt;<code>boolean</code>&gt;</p>
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