Crypto Flexs
  • DIRECTORY
  • CRYPTO
    • ETHEREUM
    • BITCOIN
    • ALTCOIN
  • BLOCKCHAIN
  • EXCHANGE
  • ADOPTION
  • TRADING
  • HACKING
  • SLOT
Crypto Flexs
  • DIRECTORY
  • CRYPTO
    • ETHEREUM
    • BITCOIN
    • ALTCOIN
  • BLOCKCHAIN
  • EXCHANGE
  • ADOPTION
  • TRADING
  • HACKING
  • SLOT
Crypto Flexs
Home»ADOPTION NEWS»Building Real-Time Language Translation in JavaScript with AssemblyAI and DeepL
ADOPTION NEWS

Building Real-Time Language Translation in JavaScript with AssemblyAI and DeepL

By Crypto FlexsJuly 14, 20244 Mins Read
Facebook Twitter Pinterest LinkedIn Tumblr Email
Building Real-Time Language Translation in JavaScript with AssemblyAI and DeepL
Share
Facebook Twitter LinkedIn Pinterest Email

Ted Hisokawa
July 14, 2024 05:20

Learn how to build a real-time language translation service in JavaScript using AssemblyAI and DeepL. A step-by-step guide for developers.





AssemblyAI provides insight into how to build a real-time language translation service using JavaScript in a comprehensive tutorial. The tutorial leverages AssemblyAI to perform real-time speech-to-text conversion and leverages DeepL to translate the converted text into multiple languages.

Introducing Real-Time Translation

Translation plays a vital role in communication and accessibility across languages. For example, foreign tourists may have difficulty communicating if they do not understand the local language. AssemblyAI’s Streaming Speech-to-Text service transcribes speech in real time and then translates it using DeepL to enable seamless communication.

Project Settings

The tutorial starts by setting up a Node.js project. The required dependencies are installed, including Express.js to create a simple server, dotenv to manage environment variables, and the official libraries for AssemblyAI and DeepL.

mkdir real-time-translation
cd real-time-translation
npm init -y
npm install express dotenv assemblyai deepl-node

The API keys for AssemblyAI and DeepL are stored in the .env file to keep them secure and prevent them from being exposed to the frontend.

Create backend

The backend is designed to keep API keys safe and generate temporary tokens for secure communication with the AssemblyAI and DeepL APIs. Routes are defined to provide the frontend and handle token generation and text translation.

const express = require("express");
const deepl = require("deepl-node");
const  AssemblyAI  = require("assemblyai");
require("dotenv").config();

const app = express();
const port = 3000;

app.use(express.static("public"));
app.use(express.json());

app.get("https://blockchain.news/", (req, res) => 
  res.sendFile(__dirname + "/public/index.html");
);

app.get("/token", async (req, res) => 
  const token = await client.realtime.createTemporaryToken( expires_in: 300 );
  res.json( token );
);

app.post("/translate", async (req, res) => 
  const  text, target_lang  = req.body;
  const translation = await translator.translateText(text, "en", target_lang);
  res.json( translation );
);

app.listen(port, () => 
  console.log(`Listening on port $port`);
);

Front-end development

The frontend consists of an HTML page with text areas for displaying transcripts and translations, and buttons to start and stop recording. The AssemblyAI SDK and RecordRTC library are used for real-time audio recording and transcription.

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Voice Recorder with Transcription</title>
    <script src="https://cdn.tailwindcss.com"></script>
  </head>
  <body>
    <div class="min-h-screen flex flex-col items-center justify-center bg-gray-100 p-4">
      <div class="w-full max-w-6xl bg-white shadow-md rounded-lg p-4 flex flex-col md:flex-row space-y-4 md:space-y-0 md:space-x-4">
        <div class="flex-1">
          <label for="transcript" class="block text-sm font-medium text-gray-700">Transcript</label>
          <textarea id="transcript" rows="20" class="mt-1 block w-full p-2 border border-gray-300 rounded-md shadow-sm"></textarea>
        </div>
        <div class="flex-1">
          <label for="translation" class="block text-sm font-medium text-gray-700">Translation</label>
          <select id="translation-language" class="mt-1 block w-full p-2 border border-gray-300 rounded-md shadow-sm">
            <option value="es">Spanish</option>
            <option value="fr">French</option>
            <option value="de">German</option>
            <option value="zh">Chinese</option>
          </select>
          <textarea id="translation" rows="18" class="mt-1 block w-full p-2 border border-gray-300 rounded-md shadow-sm"></textarea>
        </div>
      </div>
      <button id="record-button" class="mt-4 px-6 py-2 bg-blue-500 text-white rounded-md shadow">Record</button>
    </div>
    <script src="https://www.unpkg.com/assemblyai@latest/dist/assemblyai.umd.min.js"></script>
    <script src="https://www.WebRTC-Experiment.com/RecordRTC.js"></script>
    <script src="main.js"></script>
  </body>
</html>

Real-time transcription and translation

The main.js file handles audio recording, transcription, and translation. The AssemblyAI real-time transcription service processes the audio, and the DeepL API translates the final transcription into the language of your choice.

const recordBtn = document.getElementById("record-button");
const transcript = document.getElementById("transcript");
const translationLanguage = document.getElementById("translation-language");
const translation = document.getElementById("translation");

let isRecording = false;
let recorder;
let rt;

const run = async () => {
  if (isRecording) 
    if (rt) 
      await rt.close(false);
      rt = null;
    
    if (recorder) 
      recorder.stopRecording();
      recorder = null;
    
    recordBtn.innerText = "Record";
    transcript.innerText = "";
    translation.innerText = "";
   else {
    recordBtn.innerText = "Loading...";
    const response = await fetch("/token");
    const data = await response.json();
    rt = new assemblyai.RealtimeService( token: data.token );
    const texts = ;
    let translatedText = "";
    rt.on("transcript", async (message) => 
      let msg = "";
      texts(message.audio_start) = message.text;
      const keys = Object.keys(texts);
      keys.sort((a, b) => a - b);
      for (const key of keys) 
        if (texts(key)) 
          msg += ` $texts(key)`;
        
      
      transcript.innerText = msg;
      if (message.message_type === "FinalTranscript") 
        const response = await fetch("/translate", 
          method: "POST",
          headers: 
            "Content-Type": "application/json",
          ,
          body: JSON.stringify(
            text: message.text,
            target_lang: translationLanguage.value,
          ),
        );
        const data = await response.json();
        translatedText += ` $data.translation.text`;
        translation.innerText = translatedText;
      
    );
    rt.on("error", async (error) => 
      console.error(error);
      await rt.close();
    );
    rt.on("close", (event) => 
      console.log(event);
      rt = null;
    );
    await rt.connect();
    navigator.mediaDevices
      .getUserMedia( audio: true )
      .then((stream) => 
        recorder = new RecordRTC(stream, 
          type: "audio",
          mimeType: "audio/webm;codecs=pcm",
          recorderType: StereoAudioRecorder,
          timeSlice: 250,
          desiredSampRate: 16000,
          numberOfAudioChannels: 1,
          bufferSize: 16384,
          audioBitsPerSecond: 128000,
          ondataavailable: async (blob) => 
            if (rt) 
              rt.sendAudio(await blob.arrayBuffer());
            
          ,
        );
        recorder.startRecording();
        recordBtn.innerText = "Stop Recording";
      )
      .catch((err) => console.error(err));
  }
  isRecording = !isRecording;
};
recordBtn.addEventListener("click", () => 
  run();
);

conclusion

This tutorial shows how to build a real-time language translation service using AssemblyAI and DeepL in JavaScript. These tools can significantly improve user communication and accessibility in a variety of linguistic contexts. For more detailed instructions, visit the original AssemblyAI tutorial.

Image source: Shutterstock


Share. Facebook Twitter Pinterest LinkedIn Tumblr Email

Related Posts

Vaneck launches GPZ ETF for alternative asset managers.

June 7, 2025

Thorchain integrates the director of the XRP to facilitate the distributed swap.

June 7, 2025

Thorchain integrates the director of the XRP to facilitate the distributed swap.

June 7, 2025
Add A Comment

Comments are closed.

Recent Posts

Trump memoin is faced with a $ 520m lock in July and the price drops by 85%.

June 7, 2025

Vaneck launches GPZ ETF for alternative asset managers.

June 7, 2025

Apple, X, Airbnb Eye Stablecoin Integration

June 7, 2025

Strategy to raise almost $ 1B by STRD priority proposal for BTC accumulation

June 7, 2025

Hash research CEO is appointed chief policy officer at the presidential office

June 7, 2025

Thorchain integrates the director of the XRP to facilitate the distributed swap.

June 7, 2025

Thorchain integrates the director of the XRP to facilitate the distributed swap.

June 7, 2025

Coinbase adds a pancake swap to Roadmap to Surges for BNB Chain Dex to record $ 173,000,000 in monthly.

June 7, 2025

Nautilus launches anti -tamper prevention Oracles in Sui Mainnet.

June 7, 2025

Binance Alpha Listing Drive Skating Token Price 33%

June 7, 2025

Data Center security improvement: Role and risk of base board management controller

June 7, 2025

Crypto Flexs is a Professional Cryptocurrency News Platform. Here we will provide you only interesting content, which you will like very much. We’re dedicated to providing you the best of Cryptocurrency. We hope you enjoy our Cryptocurrency News as much as we enjoy offering them to you.

Contact Us : Partner(@)Cryptoflexs.com

Top Insights

Trump memoin is faced with a $ 520m lock in July and the price drops by 85%.

June 7, 2025

Vaneck launches GPZ ETF for alternative asset managers.

June 7, 2025

Apple, X, Airbnb Eye Stablecoin Integration

June 7, 2025
Most Popular

Solana DApps volume increases 46% in one week. Is $180 SOL next?

October 1, 2024

Forget the eyeballs – New TON Ecosystem Initiative Offers $5 Million in Palm Scan Incentives

April 8, 2024

5 Best Meme Coins to Buy for Huge Profits as the Next Meme Rally Approaches

July 30, 2024
  • Home
  • About Us
  • Contact Us
  • Disclaimer
  • Privacy Policy
  • Terms and Conditions
© 2025 Crypto Flexs

Type above and press Enter to search. Press Esc to cancel.