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    2.0.0-beta.2 • Public • Published

    Real-time automatic speech recognition and natural language understanding tools in one flexible API

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    Speechly browser client

    Release build npm version License

    With the browser-client you can add voice features to any website. It handles authentication, audio capture, network streaming and connection management with the Speechly Voice API.

    Check out the browser-client-example repository for a demo app built using this client.

    NOTE: If you are using React, you can use our React client instead. It provides the same functionalities, but provides a programming model that is idiomatic to React.

    Usage with Node

    Install the package:

    # Using Yarn
    yarn add @speechly/browser-client
    # Using NPM
    npm install --save @speechly/browser-client

    Start using the client:

    import { BrowserClient, BrowserMicrophone, Segment } from '@speechly/browser-client'
    // Create a new client.
    // NOTE: Configure and get your appId from
    const client = new BrowserClient({ appId: 'your-app-id' })
    // Create a microphone
    const microphone = new BrowserMicrophone()
    // Initialize the microphone - this will ask the user for microphone permissions
    // and establish the connection to Speechly API.
    // Make sure you call `initialize` from a user action handler
    // (e.g. from a button press handler).
    await microphone.initialize()
    // bind the microphone to the client
    await client.attach(microphone.mediaStream)
    // React to the updates from the API.
    client.onSegmentChange((segment: Segment) => {
      console.log('Received new segment from the API:',
    // Start recording.
    // This can be bound to e.g. a button press.
    await client.startContext()
    // Stop recording after a timeout.
    // This can be bound to e.g. a button press.
    setTimeout(async function () {
      await client.stopContext()
    }, 3000)

    Usage with browsers

    This sample HTML loads Speechly's browser-client ES modules via a CDN that mirrors npm packages. The page displays a text field that you dictate text into. See browser's console log for raw segment feed from Speechly.

    Please use a HTML server to view the example. Running it as a file will not work due to browser's security restrictions. For example run serve . on command line and open localhost:3000 in your browser.

        <input id="textBox" type="text" placeholder="Hold to talk..." autofocus />
        <script type="module">
          // Load Speechly ES module from a CDN. Note script type="module"
          import { BrowserClient, BrowserMicrophone } from "../core/"
          const widget = document.getElementById("textBox")
          // Create a Speechly client instance.
          // NOTE: Configure and get your appId from
          const speechly = new BrowserClient({
            appId: "your-app-id",
            debug: true,
            logSegments: true,
          const microphone = new BrowserMicrophone()
          speechly.onSegmentChange(segment => {
            // Clean up and concatenate words
            let transcript = segment.words
              .map(w => w.value.toLowerCase())
              .join(" ");
            // Add trailing period upon segment end.
            if (segment.isFinal) transcript += ".";
            widget.value = transcript;
          const startListening = async () => {
            if (microphone.mediaStream === undefined) {
              await microphone.initialize()
            return speechly.startContext();
          const stopListening = async () => {
            if (speechly.isListening()) {
              return speechly.stopContext();
          // Bind start listening to a widget hold, release anywhere to stop
          widget.addEventListener("mousedown", startListening)
          document.addEventListener("mouseup", stopListening)


    You can find the detailed browser-client API documentation in the GitHub repository.

    You can also refer to Speechly Docs for more information.


    See contribution guide in


    npm i @iteleport/speechly-browser-client

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