How do I make a browser app read text aloud using an API?

You can make a browser app read text aloud by sending the text to a text-to-speech API, then playing the returned audio in the browser.

Basic flow

1. User enters text.
2. Your app sends that text to a TTS API.
3. API returns audio data or an audio URL.
4. Browser plays the audio with an <audio> element or Web Audio API.

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Example: using a generic TTS API

HTML

<textarea id="text">Hello world</textarea>
<button id="speak">Speak</button>
<audio id="player" controls></audio>

JavaScript

document.getElementById("speak").addEventListener("click", async () => {
  const text = document.getElementById("text").value;

  const response = await fetch("https://api.example.com/tts", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "Authorization": "Bearer YOUR_API_KEY"
    },
    body: JSON.stringify({
      text: text,
      voice: "en-US"
    })
  });

  if (!response.ok) {
    console.error("TTS request failed");
    return;
  }

  // If API returns audio as a file/blob
  const audioBlob = await response.blob();
  const audioUrl = URL.createObjectURL(audioBlob);

  const player = document.getElementById("player");
  player.src = audioUrl;
  player.play();
});

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If the API returns a URL instead of raw audio

Some APIs return JSON like:

{ "audioUrl": "https://..." }

Then do:

const data = await response.json();
const player = document.getElementById("player");
player.src = data.audioUrl;
player.play();

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If you don’t need an external API

Browsers also have built-in speech synthesis:

const utterance = new SpeechSynthesisUtterance("Hello world");
speechSynthesis.speak(utterance);

This is easier, but voices and quality depend on the browser/device.

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Important notes

• Don’t expose secret API keys in frontend code if the service requires a private key. Use a backend proxy.
• Handle autoplay restrictions: browsers often require a user click before audio can play.
• For long text, you may need to split it into chunks depending on API limits.

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Recommended architecture

Frontend

• Collect text
• Send request to your backend

Backend

• Calls the TTS provider securely
• Returns audio or a signed URL

If you want, I can show you:

1. a full example with a real TTS API,
2. a version using only browser built-in speech synthesis, or
3. a secure frontend + backend setup.