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HTML

              
                <div class="widget-wrap">
  <div id="talk"></div>
  <h1>JAVASCRIPT VOICE COMMANDS</h1>
  
  <!-- (A) DEMO WRAPPER -->
  <div id="vwrap"></div>

  <!-- (B) DEMO BUTTON -->
  <input type="button" id="vbtn" value="Loading" disabled/>
  <div>Try "power on", "power off", or "say hello".</div>
  
  <!-- (X) VISIT CODE-BOXX -->
  <div id="code-boxx">
    Visit
    <a href="https://code-boxx.com/voice-commands-javascript-speech-recognition/" target="_blank">
      Code Boxx
    </a> for more details.
  </div>
</div>
              
            
!

CSS

              
                /* (X) DOES NOT MATTER - COSMETICS */
/* PAGE & BODY */
* {
  font-family: arial, sans-serif;
  box-sizing: border-box;
}

body {
  display: flex;
  align-items: center; justify-content: center;
  min-height: 100vh;
  background-image: url(https://images.unsplash.com/photo-1619793906000-a89279ed88e0?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0NzMxMTIzMQ&ixlib=rb-1.2.1&q=85);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  text-align: center;
}

/* WIDGET */
.widget-wrap {
  width: 600px;
  padding: 30px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.4);
}

/* SVG */
#talk {
  width: 100%; height:120px;
  background-image: url('data:image/svg+xml;utf8,<svg viewBox="0 0 512 512" width="100" xmlns="http://www.w3.org/2000/svg"><path d="M256 32C114.6 32 0 125.1 0 240c0 49.6 21.4 95 57 130.7C44.5 421.1 2.7 466 2.2 466.5c-2.2 2.3-2.8 5.7-1.5 8.7S4.8 480 8 480c66.3 0 116-31.8 140.6-51.4 32.7 12.3 69 19.4 107.4 19.4 141.4 0 256-93.1 256-208S397.4 32 256 32zM128 272c-17.7 0-32-14.3-32-32s14.3-32 32-32 32 14.3 32 32-14.3 32-32 32zm128 0c-17.7 0-32-14.3-32-32s14.3-32 32-32 32 14.3 32 32-14.3 32-32 32zm128 0c-17.7 0-32-14.3-32-32s14.3-32 32-32 32 14.3 32 32-14.3 32-32 32z" /></svg>');
  background-repeat: no-repeat;
  background-position: center;
}

/* FOOTER */
#code-boxx {
  font-weight: 600;
  margin-top: 30px;
}
#code-boxx a, input[type=button] {
  display: inline-block;
  border: 0;
  padding: 5px;
  text-decoration: none;
  background: #b90a0a;
  color: #fff;
}
input[type=button] {
  font-size: 1.5em;
  padding: 10px;
  font-weight: 700;
  margin-bottom: 20px;
}
              
            
!

JS

              
                var voice = {
  // (A) INIT VOICE COMMAND
  wrap : null, // HTML DEMO <DIV> WRAPPER
  btn : null, // HTML DEMO BUTTON
  recog : null, // SPEECH RECOGNITION OBJECT
  init : () => {
    // (A1) GET HTML ELEMENTS
    voice.wrap = document.getElementById("vwrap");
    voice.btn = document.getElementById("vbtn");

    // (A2) GET MIC ACCESS PERMISSION
    navigator.mediaDevices.getUserMedia({ audio: true })
    .then((stream) => {
      // (A3) SPEECH RECOGNITION OBJECT & SETTINGS
      const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
      voice.recog = new SpeechRecognition();
      voice.recog.lang = "en-US";
      voice.recog.continuous = false;
      voice.recog.interimResults = false;

      // (A4) ON SPEECH RECOGNITION - RUN CORRESPONDING COMMAND
      voice.recog.onresult = (evt) => {
        let said = evt.results[0][0].transcript.toLowerCase();
        if (cmd[said]) { cmd[said](); }
        else { said += " (command not found)"; }
        voice.wrap.innerHTML = said;
        voice.stop();
      };

      // (A5) ON SPEECH RECOGNITION ERROR
      voice.recog.onerror = (err) => { console.error(evt); };

      // (A6) READY!
      voice.btn.disabled = false;
      voice.stop();
    })
    .catch((err) => {
      console.error(err);
      voice.wrap.innerHTML = "Please enable access and attach a microphone.";
    });
  },

  // (B) START SPEECH RECOGNITION
  start : () => {
    voice.recog.start();
    voice.btn.onclick = voice.stop;
    voice.btn.value = "Speak Now Or Click Again To Cancel";
  },

  // (C) STOP/CANCEL SPEECH RECOGNITION
  stop : () => {
    voice.recog.stop();
    voice.btn.onclick = voice.start;
    voice.btn.value = "Press To Speak";
  }
};
window.addEventListener("DOMContentLoaded", voice.init);

// (D) COMMANDS LIST
var cmd = {
  "power on" : () => {
    voice.wrap.style.backgroundColor = "yellow";
    voice.wrap.style.color = "black";
  },

  "power off" : () => {
    voice.wrap.style.backgroundColor = "black";
    voice.wrap.style.color = "white";
  },

  "say hello" : () => {
    alert("Hello World!");
  }
};

              
            
!
999px

Console