Automatically convert web content to audio

Overview

The Auto Audio API enables automatic conversion of web articles into high-quality audio content. Simply provide a URL, and the system will extract content, generate professional narration, apply audio mixing, and return an embeddable audio player.

Usage

The simplest way to add Everlit Auto Audio to your website is by including a widget container and the JavaScript SDK. The widget will automatically detect content on your page and convert it to audio.

Basic Implementation

Add the following HTML to your page where you want the audio player to appear:

Copy<!-- 1. The widget container -->
<div
  id="everlit-auto-audio-widget"
  data-publication-id="YOUR-PUBLICATION-ID"
  style="height: 136px; width: 100%;"
  hidden
><a href="https://everlit.audio/" rel="nofollow">Listen to this article &mdash; audio by Everlit</a></div>

<!-- 2. The script -->
<script
  defer
  src="https://cdn.everlit.audio/libs/everlitAutoAudio.js"
  type="text/javascript"
></script>

Widget Container

Script Tag

API Host (advanced)

By default the widget calls https://creator.everlit.audio. If Everlit support has given you a dedicated or regional host, set data-everlit-host on either the script tag or the widget container — the script tag wins if both are present.

Copy<script
  defer
  src="https://cdn.everlit.audio/libs/everlitAutoAudio.js"
  data-everlit-host="https://creator.everlit.audio"
  type="text/javascript"
></script>

<!-- or on the container -->
<div
  id="everlit-auto-audio-widget"
  data-publication-id="YOUR-PUBLICATION-ID"
  data-everlit-host="https://creator.everlit.audio"
></div>

How It Works

When the script loads, it will:

1. Detect the canonical URL of your page
2. Check if audio already exists for this content
3. If audio exists, display the embedded player
4. If not, display a click-to-create widget (if enabled for your publication)
5. Dispatch JavaScript events for each state change

Widget v2

Version 3.0.0 of everlitAutoAudio.js shipped on 2026-09-02. The install snippet, the widget container attributes, and the event names are unchanged — existing integrations keep working. Three things are new.

What Changed

The window.Everlit Namespace

window.Everlit is shared with the Everlit playlist embed; the Auto Audio widget only ever writes under Everlit.autoAudio.

Copydocument.addEventListener('everlit:ready', function () {
  console.log(window.Everlit.autoAudio.version);      // "3.0.0"
  console.log(window.Everlit.autoAudio.host);         // "https://creator.everlit.audio"
  console.log(window.Everlit.autoAudio.initialized);  // true
});

Version Reporting

The widget identifies itself on every request so support can tell which build a page is running:

• POST /audio/auto — client_version in the JSON body
• GET /audio/auto/check — client_version inside the encoded evp parameter

Response Status

Every response the widget receives now includes a status string. All previously documented fields (successful, embed, waiting, create, metadata, reason, …) are still present, so existing field checks keep working — status is the simpler way to branch.

Article Identifiers

Authentication

All API requests require authentication using a bearer token:

CopyAuthorization: Bearer YOUR_API_TOKEN

Endpoints

POST /audio/auto POST

Request Body

Copy{
  "url": "https://example.com/article",
  "publication_id": "pblc_abc123xyz",
  "conversation_mode": true,
  "sonic_optimizer": true,
  "client_version": "3.0.0"
}

Required Parameters

Optional Parameters

These friendly aliases are also accepted, each mapping to the canonical parameter (if both are sent, the canonical key wins): music → mix, intro_music → intro_mixable_id, outro_music → outro_mixable_id, audio_polish → sonic_optimizer, audio_polish_level → optimizer_level, podcast_mode → conversation_mode.

Response Examples

Copy{
  "successful": true,
  "status": "ready",
  "embed": "<iframe src=\"https://everlit.audio/embeds/artl_abc123?eut=xyz\" frameborder=\"0\"></iframe>",
  "article_id": "artl_abc123",
  "player_url": "https://everlit.audio/embeds/artl_abc123",
  "metadata": {
    "title": "Article Title",
    "summary": "Article summary text",
    "duration": 245.5
  },
  "dom_query_params": null,
  "published_at": "2025-09-29T10:30:00Z",
  "duration": 245.5,
  "title": "Article Title",
  "summary": "Article summary text",
  "authors": ["Author Name"],
  "tags": ["category:News", "author:Author Name", "language:English"],
  "disclaimer_ui_text": "This audio was generated using AI"
}

Copy{
  "successful": true,
  "status": "processing",
  "waiting": true,
  "article_id": "artl_abc123",
  "player_url": "https://everlit.audio/embeds/artl_abc123",
  "message": "Everlit audio conversion is still in progress."
}

Copy{
  "successful": false,
  "status": "error",
  "reason": "Unable to fetch the article content."
}

GET /audio/auto/check GET

Query Parameters

EVP Encoding

The evp parameter contains URL-safe base64-encoded JSON:

Copy// Original object
const params = {
  url: "https://example.com/article",
  publication_id: "pblc_abc123xyz",
  eut: "optional_analytics_token",
  client_version: "3.0.0"   // sent by everlitAutoAudio.js v2; optional for your own code
};

// Encode to URL-safe base64
const evp = btoa(JSON.stringify(params))
  .replace(/\+/g, '-')
  .replace(/\//g, '_')
  .replace(/=/g, '');

Code Examples

Copyasync function convertToAudio(url, publicationId) {
  // Check current status
  const params = {
    url: url,
    publication_id: publicationId
  };

  const evp = btoa(JSON.stringify(params))
    .replace(/\+/g, '-')
    .replace(/\//g, '_')
    .replace(/=/g, '');

  const checkResponse = await fetch(
    `https://creator.everlit.audio/audio/auto/check?evp=${evp}`
  );
  const checkData = await checkResponse.json();

  if (checkData.embed) {
    return checkData.embed; // Already ready!
  }

  if (checkData.create || checkData.waiting) {
    // Initiate if needed
    if (checkData.create) {
      await fetch('https://creator.everlit.audio/audio/auto', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(params)
      });
    }

    // Poll for completion
    return await pollForCompletion(url, publicationId);
  }
}

async function pollForCompletion(url, publicationId, maxAttempts = 60) {
  for (let i = 0; i < maxAttempts; i++) {
    await new Promise(r => setTimeout(r, 5000)); // Wait 5s

    const params = { url, publication_id: publicationId };
    const evp = btoa(JSON.stringify(params))
      .replace(/\+/g, '-')
      .replace(/\//g, '_')
      .replace(/=/g, '');

    const response = await fetch(
      `https://creator.everlit.audio/audio/auto/check?evp=${evp}`
    );
    const data = await response.json();

    if (data.embed) return data.embed;
    if (!data.waiting) throw new Error(data.reason);
  }

  throw new Error('Conversion timeout');
}

// Usage
const embed = await convertToAudio(
  'https://example.com/article',
  'pblc_abc123xyz'
);
document.getElementById('player').innerHTML = embed;

Copy# Initiate conversion
curl -X POST https://creator.everlit.audio/audio/auto \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -d '{
    "url": "https://example.com/article",
    "publication_id": "pblc_abc123xyz",
    "conversation_mode": true,
    "sonic_optimizer": true
  }'

# Check status (encode the parameters first)
EVP=$(echo -n '{"url":"https://example.com/article","publication_id":"pblc_abc123xyz"}' | \
  base64 | tr '+/' '-_' | tr -d '=')

curl "https://creator.everlit.audio/audio/auto/check?evp=$EVP"

Copyimport requests
import json
import base64
import time

class EverlitAutoAudio:
    BASE_URL = 'https://creator.everlit.audio'

    def __init__(self, publication_id, api_token=None):
        self.publication_id = publication_id
        self.api_token = api_token

    def convert_article(self, url, **options):
        # Check status
        status = self.check_status(url)
        if status.get('embed'):
            return status['embed']

        # Initiate if needed
        if status.get('create'):
            self.initiate_conversion(url, **options)

        # Poll for completion
        return self.poll_for_completion(url)

    def check_status(self, url):
        params = {'url': url, 'publication_id': self.publication_id}
        evp = base64.urlsafe_b64encode(
            json.dumps(params).encode()
        ).decode().rstrip('=')

        response = requests.get(
            f'{self.BASE_URL}/audio/auto/check',
            params={'evp': evp}
        )
        return response.json()

    def initiate_conversion(self, url, **options):
        headers = {'Content-Type': 'application/json'}
        if self.api_token:
            headers['Authorization'] = f'Bearer {self.api_token}'

        payload = {
            'url': url,
            'publication_id': self.publication_id,
            **options
        }

        response = requests.post(
            f'{self.BASE_URL}/audio/auto',
            headers=headers,
            json=payload
        )
        return response.json()

    def poll_for_completion(self, url, max_attempts=60):
        for _ in range(max_attempts):
            time.sleep(5)
            status = self.check_status(url)
            if status.get('embed'):
                return status['embed']
        raise Exception('Conversion timeout')

# Usage
client = EverlitAutoAudio('pblc_abc123xyz', 'your_token')
embed = client.convert_article(
    'https://example.com/article',
    conversation_mode=True,
    sonic_optimizer=True
)
print(embed)

Copyrequire 'net/http'
require 'json'
require 'base64'

class EverlitAutoAudio
  BASE_URL = 'https://creator.everlit.audio'

  def initialize(publication_id, api_token = nil)
    @publication_id = publication_id
    @api_token = api_token
  end

  def convert_article(url, options = {})
    status = check_status(url)
    return status[:embed] if status[:embed]

    initiate_conversion(url, options) if status[:create]
    poll_for_completion(url)
  end

  def check_status(url)
    params = { url: url, publication_id: @publication_id }
    evp = Base64.urlsafe_encode64(params.to_json, padding: false)

    uri = URI("#{BASE_URL}/audio/auto/check?evp=#{evp}")
    response = Net::HTTP.get_response(uri)
    JSON.parse(response.body, symbolize_names: true)
  end

  def initiate_conversion(url, options = {})
    uri = URI("#{BASE_URL}/audio/auto")
    request = Net::HTTP::Post.new(uri)
    request['Content-Type'] = 'application/json'
    request['Authorization'] = "Bearer #{@api_token}" if @api_token

    body = { url: url, publication_id: @publication_id }.merge(options)
    request.body = body.to_json

    response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
      http.request(request)
    end

    JSON.parse(response.body, symbolize_names: true)
  end

  def poll_for_completion(url, max_attempts = 60)
    max_attempts.times do
      sleep(5)
      status = check_status(url)
      return status[:embed] if status[:embed]
    end
    raise "Conversion timeout"
  end
end

# Usage
client = EverlitAutoAudio.new('pblc_abc123xyz', 'your_token')
embed = client.convert_article(
  'https://example.com/article',
  conversation_mode: true,
  sonic_optimizer: true
)
puts embed

Error Handling

Common Error Scenarios

Retry Strategy

Copyasync function withRetry(fn, maxRetries = 5) {
  for (let i = 0; i < maxRetries; i++) {
    try {
      return await fn();
    } catch (error) {
      if (i === maxRetries - 1) throw error;

      const delay = Math.pow(2, i) * 1000; // Exponential backoff
      await new Promise(r => setTimeout(r, delay));
    }
  }
}

Complete Parameter Reference

Server-Side Content Ingestion

If your system already has the article content (for example, a headless CMS or a feed ingestion pipeline), you can supply it directly in the POST /audio/auto body instead of relying on automatic content extraction. This produces deterministic audio that does not depend on the quality of server-side scraping.

Modes of Operation

• Full override (scraping skipped): when the body contains both text and title, the system uses your content verbatim and does not fetch or scrape the page. The url is still required, but only as the canonical identifier and cache key.
• Per-field override (scraping fills the gaps): if you provide some content fields but omit text or title (and send no structured data), the page is scraped and your supplied fields take precedence — extraction fills only the fields you leave blank. For example, send only text to replace the article body while letting extraction supply the title, image, and byline.

Ingestion Parameters

Example (Full Override)

Copycurl -X POST https://creator.everlit.audio/audio/auto \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -d '{
    "url": "https://example.com/article",
    "publication_id": "pblc_abc123xyz",
    "title": "City Council Approves New Transportation Plan",
    "text": "The city council voted 7-2 on Tuesday to approve a comprehensive transportation plan...",
    "authors": ["Jane Doe", "John Smith"],
    "summary": "A comprehensive look at the new transportation plan.",
    "category": "Local News",
    "art_url": "https://example.com/images/council.jpg",
    "published_at": "2026-05-29T10:30:00Z",
    "tags": ["transportation", "city-council"]
  }'

JavaScript Events

The Auto Audio widget emits custom DOM events that allow you to react to various states of the audio player lifecycle. These events are useful for showing/hiding related UI elements, tracking analytics, or integrating with your page's behavior.

Available Events

Event Details

everlit:ready

Fired when the audio player is successfully embedded on the page. This is the primary event for most integrations.

Event Detail Properties

Metadata Object

Example Response

Copy// Example e.detail value:
{
  embed: true,
  element: HTMLDivElement,
  articleId: "artl_7kX9mPqR2Nw",
  playerUrl: "https://everlit.audio/embeds/artl_7kX9mPqR2Nw",
  status: "ready",
  metadata: {
    title: "City Council Approves New Transportation Plan",
    summary: "The city council voted 7-2 to approve a comprehensive transportation plan that includes new bike lanes, expanded bus routes, and infrastructure improvements.",
    duration: 187.3
  }
}

Usage Example

Copydocument.addEventListener('everlit:ready', function(e) {
  console.log('Audio player ready!', e.detail);

  // Show a related element
  document.querySelector('.audio-controls').style.display = 'block';

  // Display formatted duration
  if (e.detail.metadata?.duration) {
    const minutes = Math.round(e.detail.metadata.duration / 60);
    document.querySelector('.listen-time').textContent = minutes + ' min listen';
  }

  // Display title
  if (e.detail.metadata?.title) {
    document.querySelector('.audio-title').textContent = e.detail.metadata.title;
  }
});

everlit:clickToCreate

Fired when a click-to-create widget is displayed (for publications with on-demand audio generation).

Copydocument.addEventListener('everlit:clickToCreate', function(e) {
  // e.detail contains:
  // {
  //   clickToCreate: true,
  //   processing: false,          // true if already being created
  //   element: HTMLElement,       // The click widget element
  //   status: "click_to_create"   // added in widget v2; "processing" while it is being created
  // }

  if (!e.detail.processing) {
    // Show a hint to encourage users to click
    document.querySelector('.create-audio-hint').style.display = 'block';
  }
});

everlit:processing

Fired when audio conversion begins (after user clicks to create or auto-conversion starts).

Copydocument.addEventListener('everlit:processing', function(e) {
  // e.detail contains:
  // {
  //   processing: true,
  //   url: "https://example.com/article"
  // }

  // Show a loading state
  document.querySelector('.audio-loading').style.display = 'block';
});

everlit:error

Fired when an error occurs during the audio check or conversion process.

Copydocument.addEventListener('everlit:error', function(e) {
  // e.detail contains:
  // {
  //   error: true,
  //   reason: "Error description"
  // }

  console.error('Everlit error:', e.detail.reason);

  // Optionally hide the player area on error
  document.querySelector('.audio-player-container').style.display = 'none';
});

Complete Integration Example

Here's a full example showing how to use events to control page elements based on audio availability:

Copy<!-- Your page HTML -->
<div id="everlit-auto-audio-widget" data-publication-id="pblc_xxx"></div>

<div class="audio-info" style="display: none;">
  <span class="listen-time"></span>
  <button class="share-audio-btn">Share Audio</button>
</div>

<script defer src="https://cdn.everlit.audio/libs/everlitAutoAudio.js"></script>
<script>
  // Show audio info when player is ready
  document.addEventListener('everlit:ready', function(e) {
    const audioInfo = document.querySelector('.audio-info');
    audioInfo.style.display = 'flex';

    // Display duration
    if (e.detail.metadata?.duration) {
      const minutes = Math.round(e.detail.metadata.duration / 60);
      document.querySelector('.listen-time').textContent = minutes + ' min listen';
    }

    // Log for analytics
    console.log('Audio loaded for article:', e.detail.articleId);
  });

  // Hide audio info on error
  document.addEventListener('everlit:error', function(e) {
    document.querySelector('.audio-info').style.display = 'none';
  });
</script>

Best Practices

Widget Placement

• Place the widget container early in your article template for best visibility
• Use the hidden attribute to prevent layout shifts before audio loads
• Set a fixed height (136px recommended) to reserve space for the player

Performance Tips

• Use the defer attribute on the script tag to avoid blocking page load
• The widget automatically caches results - repeated page loads are instant
• Consider using the JavaScript events to lazy-load related UI elements

Content Optimization

• Ensure your pages have a valid canonical URL for consistent audio matching
• Use semantic HTML to help content extraction identify article body text
• Include proper meta tags (title, description, author) for better audio metadata

Error Handling

• Listen for the everlit:error event to gracefully handle failures
• Implement retry logic with exponential backoff for transient errors
• Use the check endpoint for status polling rather than repeatedly calling the POST endpoint

Support & Resources