So I’m using the API of National Weather Service to create a weather app. But the fetched data is very complicated, and I need to fetch two different APIs. So I want to write a customized async function that returns a promise, which resolves to an object that contains only the necessary data I need.
I came up with something like this:
async function fetchWeatherAPI(){
//data that I need
let data = {};
try {
const res1 = await fetch(url1);
const result1 = await res1.json();
data = {...data , result1.usefulData};
} catch(error){}
try {
const res2 = await fetch(url2);
const result2 = await res2.json();
data = {...data, result2.usefulData};
} catch(error){}
return new Promise((resolve,reject)=>{
resolve(data);
})
}
This code is working for me. But the problem is, what if the APIs reject? How can I handle the error so that I can display the error message in the returned promise? I may want something like this:
return new Promise((resolve,reject)=>{
if(...) reject(errrorMessage);
resolve(data);
})