> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/web/audio/audio/redact-audio-file.md).

# Redact audio using JavaScript

Learn how to redact audio programmatically using JavaScript. This snippet demonstrates how to redact specific time ranges in audio files, ensuring seamless operation and customization. The Apryse Web

Here is an example of redacting audio programmatically. `redactAudio` redacts ranges of time in the audio.

{% tabs %}
{% tab title="JavaScript" %}
{% code lineNumbers="true" %}

```js
await redactAudio({
  start: startTime,
  end: endTime,
});
```

{% endcode %}
{% endtab %}
{% endtabs %}

The `start` and `end` keys are both expected to be in seconds. Returns a promise that resolves when the operation is complete. Note that `redactAudio` should not be invoked simultaneously more than once. You must wait for the previous operation to finish before beginning another.

{% tabs %}
{% tab title="JavaScript (SDK v8.0+)" %}

<pre class="language-js" data-line-numbers><code class="lang-js">import React, { useRef, useEffect } from 'react';
import WebViewer from '@pdftron/webviewer';
import { initializeAudioViewer } from '@pdftron/webviewer-audio';

const App = () => {
  const viewer = useRef(null);

  useEffect(() => {
    WebViewer(
      {
        path: '/webviewer/lib',
      },
      viewer.current
    ).then(async (instance) => {
      // Extends WebViewer to allow loading media files (.mp3, .mp4, ogg, webm, etc.)
      const { loadAudio, redactAudio } = await initializeAudioViewer(instance, {
        license: '<code class="expression">visitor.claims.wvKey || "YOUR_LICENSE_KEY"</code>',
      });

      // Load a media element at a specific url. Can be a local or public link
      // If local it needs to be relative to lib/ui/index.html.
      // Or at the root. (eg '/audio.mp3')
      const audioUrl = '/audio.mp3';
      loadAudio(audioUrl);

      instance.Core.documentViewer.addEventListener('documentLoaded', async () => {
        // Redact the audio track 0.5 - 2.0 seconds and 2.5 - 4.0 seconds.
        await redactAudio([{ start: 0.5, end: 2.0 }, { start: 2.5, end: 4.0 }]);
      });
    });
  }, []);

  return (
    &#x3C;div className="App">
      &#x3C;div className="webviewer" ref={viewer} />
    &#x3C;/div>
  );
};

export default App;
</code></pre>

{% endtab %}

{% tab title="JavaScript (SDK v7.0+)" %}

<pre class="language-js" data-line-numbers><code class="lang-js">import React, { useRef, useEffect } from 'react';
import WebViewer from '@pdftron/webviewer';
import { initializeAudioViewer } from '@pdftron/webviewer-audio';

const App = () => {
  const viewer = useRef(null);

  useEffect(() => {
    WebViewer(
      {
        path: '/webviewer/lib',
      },
      viewer.current
    ).then(async (instance) => {
      // Extends WebViewer to allow loading media files (.mp3, .mp4, ogg, webm, etc.)
      const { loadAudio, redactAudio } = await initializeAudioViewer(instance, {
        license: '<code class="expression">visitor.claims.wvKey || "YOUR_LICENSE_KEY"</code>',
      });

      // Load a media element at a specific url. Can be a local or public link
      // If local it needs to be relative to lib/ui/index.html.
      // Or at the root. (eg '/audio.mp3')
      const audioUrl = '/audio.mp3';
      loadAudio(audioUrl);

      instance.docViewer.on('documentLoaded', async () => {
        // Redact the audio track 0.5 - 2.0 seconds and 2.5 - 4.0 seconds.
        await redactAudio([{ start: 0.5, end: 2.0 }, { start: 2.5, end: 4.0 }]);
      });
    });
  }, []);

  return (
    &#x3C;div className="App">
      &#x3C;div className="webviewer" ref={viewer} />
    &#x3C;/div>
  );
};

export default App;
</code></pre>

{% endtab %}
{% endtabs %}

The user can also apply the redactions through UI.

Also see the [React sample](https://github.com/ApryseSDK/webviewer-audio-sample/), for a complete solution, with further customizations.


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