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How can I debug an "Uncaught TypeError" when using async/await with fetch in JavaScript?

Asked on Nov 09, 2025

Answer

An "Uncaught TypeError" in JavaScript often occurs when a variable or object is not of the expected type. When using async/await with fetch, this error might arise if the response is not handled correctly. Here's a basic example of how to handle fetch requests with async/await and prevent common errors.

<!-- BEGIN COPY / PASTE -->
        async function fetchData(url) {
            try {
                const response = await fetch(url);
                if (!response.ok) {
                    throw new Error(`HTTP error! status: ${response.status}`);
                }
                const data = await response.json();
                console.log(data);
            } catch (error) {
                console.error("Error fetching data:", error);
            }
        }

        fetchData("https://api.example.com/data");
        <!-- END COPY / PASTE -->

Additional Comment:

The "fetchData" function uses async/await to handle asynchronous operations.
The "try" block is used to catch errors that might occur during the fetch operation.
The "response.ok" property checks if the HTTP response status is in the range 200-299.
If the response is not ok, an error is thrown with the status code.
The "catch" block logs any errors that occur during the fetch or JSON parsing.
Always ensure the URL is correct and the server is responding as expected.

✅ Answered with JavaScript best practices.

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How can I debug an "Uncaught TypeError" when using async/await with fetch in JavaScript?

Asked on Nov 09, 2025

Answer

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