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How Promise.allSettled() handles widget loads
Promise.allSettled(iterable) returns a promise that fulfills after every input promise has either fulfilled or rejected. The resulting array stays in the same order as the inputs, and each entry reports one outcome:
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{ status: "fulfilled", value: ... }for a fulfilled promise.{ status: "rejected", reason: ... }for a rejected promise.
This lets a dashboard, for example, show weather and news even if recommendations fail. The method only collects outcomes; your application decides whether to show a fallback, omit the failed widget, or offer a retry. It does not render widgets, retry requests, cancel slow work, or impose a timeout.
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Render each widget from its own outcome
Keep a reliable link between each request and its widget. Since outcomes match input order, index-based mapping works as long as the inputs and their associated keys remain aligned. Pairing a key with each load makes that relationship easier to maintain:
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const widgets = [
{ key: "weather", load: loadWeather() },
{ key: "news", load: loadNews() },
{ key: "recommendations", load: loadRecommendations() },
];
const outcomes = await Promise.allSettled(widgets.map(({ load }) => load));
for (const [index, outcome] of outcomes.entries()) {
const key = widgets[index].key;
if (outcome.status === "fulfilled") {
renderWidget(key, outcome.value);
} else {
renderWidgetFallback(key, outcome.reason);
}
}Check status before reading value or reason; those fields belong to different outcome types. Adapt the fallback to your interface, and avoid displaying raw rejection details to users if they could reveal internal or unsuitable information. Send diagnostic details through your application’s normal logging or error-reporting path.
When to choose allSettled() or all()
| Method | Combined promise behavior | Use it when |
|---|---|---|
Promise.allSettled() |
Fulfills after every input settles and returns each outcome. | Tasks are independent, partial results are useful, and the caller needs to handle each success or failure. |
Promise.all() |
Fulfills when all inputs fulfill; rejects when an input rejects. | Tasks depend on one another or any failure should reject the combined operation. |
Do not use allSettled() simply to suppress errors from required or dependent data. Choose the method that reflects what the application can do with a partial result.
Account for the wait-for-all trade-off
The combined continuation from allSettled() cannot run until the slowest input settles. That is useful when a single rendering pass needs a complete inventory of successes and failures, but it can delay display of widgets that finished earlier. If widgets should appear as soon as their own requests complete, handle each completion separately rather than waiting for the aggregate result.
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MDN marks Promise.allSettled() as widely available across browsers since July 2020. Confirm support against the browsers and runtimes your project actually targets, especially if it must run in older or constrained environments. The method is also specified in the ECMAScript 2025 language specification.
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