Screen Recorder

This is a native screen recorder using vanilla web technologies

HTML:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link rel="stylesheet" href="./styles.css" />
  </head>
  <body>
    <h1>Grabador de Pantalla</h1>
    <button id="recorder">Iniciar grabacion</button>
    <div id="status" class="status">⚫Listo para iniciar grabacion</div>
    <video id="preview" autoplay muted></video>
 
    <script src="./main.js"></script>
  </body>
</html>

CSS:

:root {
  background-color: black;
  display: grid;
  place-content: center;
  height: 100vh;
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}
 
h1 {
  width: 600px;
  color: #fff;
  font-size: 3rem;
  margin-bottom: 1rem;
}
 
button {
  width: 600px;
  color: #fff;
  font-size: 1rem;
  padding: 1rem;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  background: #a647ff;
}
 
button:active {
  background: #8400ff;
}
 
.status {
  color: #ffff;
  font-size: 1.2rem;
  margin-top: 1rem;
}
 
video {
  display: block;
  width: 100%;
  max-width: 600px;
  max-height: 60vh;
  margin: 1rem auto;
  border: 2px solid #222;
  border-radius: 12px;
}

Hi there!

const button = document.getElementById("recorder");
const status = document.getElementById("status");
const preview = document.getElementById("preview");
 
let mediaStream = null;
 
button.addEventListener("click", async () => {
  try {
    if (mediaStream) {
      //detiene la vista en tiempo real
      mediaStream.getTracks().forEach((track) => track.stop());
      preview.srcObject = null;
      mediaStream = null;
      status.textContent = "⚫Grabacion detenida";
      button.textContent = "Iniciar grabacion";
      return;
    }
 
    //Pide la pantalla/ventana a grabar
    mediaStream = await navigator.mediaDevices.getDisplayMedia({
      video: { frameRate: { ideal: 30 } },
    });
 
    //establecer la vista en tiempo real
    preview.srcObject = mediaStream;
 
    //actualizar estado del boton
    status.textContent = "🔴Grabando";
    button.textContent = "Detener grabacion";
 
    //inicializamos el media recorder
    const mediaRecorder = new MediaRecorder(mediaStream, {
      mimeType: "video/webm; codecs=vp8,opus",
    });
 
    mediaRecorder.start();
 
    mediaRecorder.addEventListener("dataavailable", (e) => {
      const link = document.createElement("a");
      link.href = URL.createObjectURL(e.data);
      link.download = "Grabacion de pantalla";
      link.click();
    });
 
    mediaRecorder.addEventListener("stop", () => {
      status.textContent = "⚫Grabacion detenida";
      button.textContent = "Iniciar grabacion";
    });
 
    //finalizar la grabacion cunado la media esta finalizada
    mediaStream.getVideoTracks()[0].addEventListener("ended", () => {
      mediaRecorder.stop();
    });
  } catch (error) {
    console.log(error);
    status.textContent = "⚫Algo salio en el proseso";
  }
});