PoOwAa/cathError.js

## cathError.js
const qs = "http://notworkingurl.com";

fetch(qs)
  .then(response => {
    return response.json();
  })
  .then(data => {
    // Working code
    console.log(data);
  })
  .catch(error => {
    console.error("######## I GOT ONE ########");
    console.error(error);

    const myLoggerUrl = "http://example.com/";
    fetch(myLoggerUrl, {
      method: "POST",
      mode: "cors",
      cache: "no-cache",
      credentials: "same-origin",
      headers: {
        "Content-Type": "application/json"
      },
      redirect: "follow",
      referrer: "no-referrer",
      body: JSON.stringify(error)
    })
      .then(response => {
        return response.json();
      })
      .then(data => {
        console.log("Log sent successfully!");
      })
      .catch(error => {
        console.error("######## I GOT ONE ########");
        console.error("Logger server is not available");
        console.error(error);
        // Esetleg itt localStorage-be helyezni vagy bármi
      });
  });

## index.html
<html>
    <head>
        <script src="./catchError.js"></script>
        <title>Error küldő izébizé</title>
    </head>
    <body>
        Error küldő izébizé
    </body>
</html>
	const qs = "http://notworkingurl.com";

	fetch(qs)
	.then(response => {
	return response.json();
	})
	.then(data => {
	// Working code
	console.log(data);
	})
	.catch(error => {
	console.error("######## I GOT ONE ########");
	console.error(error);

	const myLoggerUrl = "http://example.com/";
	fetch(myLoggerUrl, {
	method: "POST",
	mode: "cors",
	cache: "no-cache",
	credentials: "same-origin",
	headers: {
	"Content-Type": "application/json"
	},
	redirect: "follow",
	referrer: "no-referrer",
	body: JSON.stringify(error)
	})
	.then(response => {
	return response.json();
	})
	.then(data => {
	console.log("Log sent successfully!");
	})
	.catch(error => {
	console.error("######## I GOT ONE ########");
	console.error("Logger server is not available");
	console.error(error);
	// Esetleg itt localStorage-be helyezni vagy bármi
	});
	});
	<html>
	<head>
	<script src="./catchError.js"></script>
	<title>Error küldő izébizé</title>
	</head>
	<body>
	Error küldő izébizé
	</body>
	</html>