Moderate JavaScript Question 124 of 229

How does Promise.all differ from Promise.allSettled?

Frontend Master · Speak this in 60–90 seconds · Faridabad & Delhi NCR

PICTURE THIS: ASYNC / PROMISE

Call fetchPromise pending

NetworkWait off stack

Then / awaitUse the JSON

Simple meaning

All fails fast if any promise rejects, which is good when every request is required.

WHY — JavaScript instead of guessing?

Why interviewers care about JavaScript:

This is a process

question about JavaScript.

Panels listen for order,

trade-offs, and what you would actually do on a Frontend project - not buzzwords.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

STEPS — What happens step by step?

Before you speak the answer, walk the interviewer through these steps:

1
All fails fast if
any promise rejects, which is good when every request is required.
2
AllSettled waits for every
result as fulfilled or rejected, which is better for dashboards that can show partial data.
3
I pick based on
whether one failure should abort the whole page.
4
Give an example
One tiny concrete case you can say aloud.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

EXAMPLE — See it in action

Here's a short line you can speak, broken into clear beats:

Say this line

“AllSettled waits for every result as fulfilled or rejected, which is better for ”

Break into beats

AllSettledwaitsforeveryresultas

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Key takeaway

All fails fast if any promise rejects, which is good when every request is required. AllSettled waits for every result as fulfilled or rejected, which is better for dashboards that can show partial data.