get_chat_id_telegram.html

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").click(function(){
	var token = $('#token_bot').val();
	console.log(token);
	if(token != null && token != "") {
		getChatId(token);
	} else {
		alert("Preencha o token para iniciar o processo");
	}
	
    
  });
  
  function getChatId(token) {
	  try {
		$.get("https://api.telegram.org/bot"+token+"/getUpdates", function(data){
			if(data.result.length  > 0){
				$('#chat_id').append(" "+data.result[0].message.chat.id);
			} else {
				getChatId(token);
			}
		}).fail(function() {
			console.log( "error" );
			getChatId(token);
		  });
	  } catch(e) {
		getChatId(token);
	  }
  }
});
</script>
</head>
<body>
<input type="text" placeholder="token chatbot" id="token_bot" />
<p id="chat_id"> Chat Id: </p>
<button>Pega Chat ID </button>


</body>
</html>