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    1.0.11 • Public • Published


    Symbl's realtime websockets adapter for Amazon Chime.

    Set Up for Symbl

    Install symbl-chime-adapter

    To get started you will need to add the symbl-chime-adapter to your node dependencies.

    npm install --save symbl-chime-adapter

    Symbl Credentials

    Create an account in the Symbl Console if you have not done so already.

    After you login, you will find your appId and appSecret on the home page.

    Create a .env file in demos/browser and demos/serverless/src that includes your appId and appSecret as shown below.


    The App ID and App Secret are used to authenticate your session with Symbl by generating an access token.

    Your App ID and Secret should not be shared or posted publicly.


    The Symbl adapter should be initialized after connecting to your Chime video conference.

    To connect each Chime participant to Symbl, it is best practice to generate the client’s access token on your backend service.

    After the token is generated it can be returned along with the chime meeting configuration as shown below. For a full example of this, please see this page of our chime demo application.

    const res = await fetch(``, {
          method: 'POST',
          mode: 'cors',
          cache: 'no-cache',
          credentials: 'same-origin',
          headers: {
            'Content-Type': 'application/json',
          redirect: 'follow',
          referrerPolicy: 'no-referrer',
          body: JSON.stringify({
            type: 'application',
            appId: symblAppId,
            appSecret: symblAppSecret,
        accessToken = await res.json();
        return response(200, 'application/json', JSON.stringify({
        JoinInfo: {
          Meeting: meeting,
          Attendee: attendee,
          Symbl: accessToken,
      }, null, 2));

    After the token is generated and returned by your server, the Symbl Access Token can be applied by setting the static property ACCESS_TOKEN of the Symbl class.

    Symbl.ACCESS_TOKEN = joinInfo.Symbl.accessToken;

    After the access token has been set and your client has joined the Chime meeting, you can instantiate the Symbl class.

    The Symbl constructor takes two parameters:


    Field Type Description
    attendeeId string Attendee unique identifier
    userName string Attendee name
    meetingId string Unique meeting identifier
    meeting string Name of meeting


    Field Type Description
    confidenceThreshold double default: 0.5 - Minimum required confidence for insight to be recognized.
    languageCode array Array of comma separated strings. Valid language codes en-US, en-GB, en-AU, it-IT, nl-NL, fr-FR, fr-CA, de-DE, es-US, ja-JP
    insightsEnabled boolean default: true - True if insights should be generated for conversation.

    Whether or not to generate insights.

      this.symbl = new Symbl(
              attendeeId: this.configuration.credentials.attendeeId,
              userName: this.configuration.credentials.externalUserId.split('#').pop(),
              meetingId: this.configuration.credentials.meetingId,
              meeting: this.meeting,
          }, {
              confidenceThreshold: 0.5,
              languageCode: 'en-US',
              insightsEnabled: true,
      // subscribe to realtime event publishers (see below)

    Subscribe to Realtime Events

    Learn how to subscribe to Symbl’s conversational insights and transcription.

    There are three different event types that you can subscribe through with Symbl’s Conversational AI Adapter for Chime.

    • Closed Captions
    • Transcripts
    • Insights

    Closed Captions

    Realtime closed captioning is enabled by default and provides realtime transcription of your audio content. Closed captioning tracks can be added to any video element through the callback handler to your Symbl instance.


    Field Type Description
    id string Insight ID
    text string Insight content
    asignee object Assignee Object

    The handler can be added using the subscribeToCaptioningEvents function of the Symbl instance.

    const captioningHandler = {
        onCaptioningToggled: (ccEnabled: boolean) => {
            // Implement
        onCaptionCreated: (caption: Caption) => {
            console.warn('Caption created', caption);
            // Retrieve the video element that you wish to add the subtitle tracks to.
            const activeVideoElement = getActiveVideoElement() as HTMLVideoElement;
            if (activeVideoElement) {
        onCaptionUpdated: (caption: Caption) => {
            const activeVideoElement = getActiveVideoElement() as HTMLVideoElement;

    Setting the video element that subtitles will be superimposed over should be done by calling the setVideoElement function on the Caption class.

    If your video chat application has alternating primary video tiles, this can be used to change which element is active.

    Realtime Insights

    Realtime insights are generated as Symbl processes the conversation in your video chat platform.

    When an Insight is detected by Symbl and the onInsightCreated event is emitted, an Insight object is passed to the callback function provided in the Insight handler.

    The Insight class holds data about the insight generated.

    Insight Class Attributes

    Field Type Description
    id string Insight ID
    text string Insight content
    asignee object Assignee Object


    The Symbl adapter exposes a handler function, subscribeToInsightEvents, that has a callback function onInsightCreated.

    Insights are enabled by default, but can be manually disabled through the insightsEnabled parameter in the config of the Symbl constructor.

    new Symbl(chimeConfiguration, {insightsEnabled: true});

    Subscribing to the Insight publisher is achieved by passing a handler to the subscribeToInsightEvents function of your Symbl instance.


    When an insight event is emitted from the onInsightCreated handler, you can use the Insight object returned and either use the createElement function to create a default element or you can use the data included in the Insight object returned in the handlers callback to create your own element, capture the data and store as a metric, etc…

    const insightHandler = {
        onInsightCreated: (insight: Insight) => {
            // Creates a predesigned insight element
            const element = insight.createElement();
            // Customize any styling
   = '98%';
            /** OR create your own element
            insight.element = document.createElement('div');
            insight.element.innerHTML = `<div style="width: auto; height: 400px">
                                     <h3 style="font-width: 400;">
            // Retrieve container you wish to add insights to.
            const insightContainer = document.getElementById('receive-insight');
            // Call add on the insight object to add it to DIV
    // Subscribe to realtime insight events using the handler created above

    Realtime Transcripts

    Realtime transcripts differ slightly from realtime closed-captioning. A Transcript object is created when after speech is no longer detected.


    Field Type Description
    message string Speech content
    userName string Speaker Name
    userId string Speaker Id
    timestamp Date Time of the transcript event


    The Transcript handler has only one event, onTranscriptCreated. Each time a speaker finishes speaking a Transcript object is generated.

    Subscribing to the transcript publisher is achieved by passing a handler to the subscribeToTranscriptEvents function of your Symblinstance.


    const transcriptHandler = {
        onTranscriptCreated: (transcript: Transcript) => {
          // Handle transcript item

    Generating Meeting Summary URL

    To generate a meeting summary URL, you need only to call the getSummaryUrlfunction of your Symbl instance.

    const meetingSummaryUrl = await symbl.getSummaryUrl();




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