api_test.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Cool Rooms</title>
</head>

<body>

  <h1>Cool Rooms</h1>

  <div id="rooms-container">
  </div>

</body>
<script>
  let roomsContainer = document.getElementById('rooms-container');

  let getRooms = async() => {
    let response = await fetch('http://127.0.0.1:8000/api/rooms/')
    let rooms = await response.json()

    for (let i = 0; rooms.length > i; i++) {
      let room = rooms[i]
      let row = `<div>
                    <h3>${room.name}</h3>
                </div>`
      roomsContainer.innerHTML += row
    }
  }
  getRooms()
</script>

</html>