javascript - Promise All with Axios

Question

I just read an Article related to promise and was unable to comprehend how we can do multiple API call using Axios via Promise.all

So consider there are 3 URL, lets call it something like this

let URL1 = "https://www.something.com"
let URL2 = "https://www.something1.com"
let URL3 = "https://www.something2.com"

And an array in which we will store Value

  let promiseArray = []

Now, I want to run this in parallel (Promise.all), but I am unable to figure our how will we do it? Because axios have a promise in itself (or at-least that's how I have used it).

axios.get(URL).then((response) => {
}).catch((error) => {
})

Question: Can someone please tell me how we can we send multiple request using promise.all and axios

Answer 1

The axios.get() method will return a promise.

The Promise.all() requires an array of promises. For example:

Promise.all([promise1, promise2, promise3])

Well then...

let URL1 = "https://www.something.com"
let URL2 = "https://www.something1.com"
let URL3 = "https://www.something2.com"

const promise1 = axios.get(URL1);
const promise2 = axios.get(URL2);
const promise3 = axios.get(URL3);

Promise.all([promise1, promise2, promise3]).then(function(values) {
  console.log(values);
});

You might wonder how the response value of Promise.all() looks like. Well then, you could easily figure it out yourself by taking a quick look at this example:

var promise1 = Promise.resolve(3);
var promise2 = 42;
var promise3 = new Promise(function(resolve, reject) {
  setTimeout(resolve, 100, 'foo');
});

Promise.all([promise1, promise2, promise3]).then(function(values) {
  console.log(values);
});
// expected output: Array [3, 42, "foo"]

For more information: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all