making multiple async call without being dependent on each other

Question

in a Node.JS app, I am trying to make 3 API calls to different endpoints, which are:

/GET ProductInformation : returns the information for the given productID.

/GET ProductRecommendation : returns the product recommendation for the given productID

/GET ProductReview : returns product reviews and rating for the given productID

None of the above call is dependent on the other, therefore, if possible, I am trying to avoid a chain of Promise like :

getProductInfo(productId)
.then(result =>{
      getProductRecommendation(productId)
.then(result =>{
      getProductReview(result => {
      callback('done') // all calls are done, we can return now!
     })
})

Is there a better approach for making this sort of async operations ? The reason that I am looking to see if there is a better way or not, is because in reality I have more than just 3 calls, and doing this makes the code hard to maintain and read.

Cody Geisler · Accepted Answer · 2020-01-20 20:28:18Z

5

Promise.all will run these all in parallel. If any of the promises fail it will go to .catch().

Promise.all([
  getProductInfo(productId),
  getProductRecommendation(productId),
  getProductReview()
])
.then(function(results){callback('done')})
.catch(err=>console.log(err));

answered Jan 20, 2020 at 20:28

Cody Geisler

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4 Comments

Benjamin Over a year ago

would it be possible to still return in case of partial failure? example, 1 out of the 10 services failed to respond.

Cody Geisler Over a year ago

Possibly, I need to test it real quick before I post something

Cody Geisler Over a year ago

You can do something like getProductInfo(productId).catch(err=>console.log(err)) and it will continue on to .then(), but doing something like "1/10" is more complicated. If you need more fine grain control I would look into async/await and try{}catch(e){} on each api call. --- or a promise library that will help orchestrate some of this. repl.it/@CodyGeisler/…

Tarazed Over a year ago

Promise.allSettled() will give you an array that tells you the results.

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