try..catch not catching async/await errors

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400/500 is not an error, it’s a response. You’d only get an exception (rejection) when there’s a network problem.

When the server answers, you have to check whether it’s good or not:

try {
    let response = await fetch('not-a-real-url')
    if (!response.ok) // or check for response.status
        throw new Error(response.statusText);
    let body = await response.text(); // or .json() or whatever
    // process body
} catch (err) {
    console.log(err)
}

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