A rejected promise bypasses the error handling you expected. How do errors propagate through promises and async/await?

Traces synchronous throws and promise rejections through chains, awaits, missing returns, and detached work.

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An async function always returns a promise. Throwing inside it rejects that promise, and awaiting a rejected promise throws at the await point. A .then handler that throws also returns a rejected promise. I trace which promise is returned or awaited; if code starts asynchronous work without either, an outer try/catch may finish before the rejection occurs.

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Whether the candidate can follow the actual promise chain and place handling at an intentional ownership boundary.

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Core answer
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Overview
A try block handles an awaited rejection inside it. It cannot catch a promise that was started and detached without being awaited or returned.
An async function always returns a promise. Throwing inside it rejects that promise, and awaiting a rejected promise throws at the await point. A .then handler that throws also returns a rejected promise. I trace which promise is returned or awaited; if code starts asynchronous work without either, an outer try/catch may finish before the rejection occurs.
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Common mistakesCandidateCommon mistakesMistakes that weaken the answer or signal shallow understanding.Open details

Details

Assuming try/catch catches any later promise rejection automatically.
Catching an error, logging it, and returning implicit success.
Forgetting to return a nested promise chain.
Treating user cancellation as an unexpected application failure.

A rejected promise bypasses the error handling you expected. How do errors propagate through promises and async/await?

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