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How do I call multiple API using Promise?
If you want to call multiple API calls simultaneously, there’s a better approach using Promise. all() . But if one API calls requires data from another, returning the fetch() method like this provides a simple, readable, flat structure and let’s you use a single catch() for all of your API calls.
How do you handle multiple API calls?
Batch Requests That said, the most performant way to handle many requests to the Directory API is to use a batch request. This allows you to bundle up all your member requests into one large batch, of up to 1000 calls. This will also give you a nice cushion in case you need to increase your requests in future!
Can a Promise have multiple then?
When a handler returns a value, it becomes the result of that promise, so the next . then is called with it. A classic newbie error: technically we can also add many . then to a single promise.
How do I call API in Promise?
let urls = [ ‘https://api.github.com/users/iliakan’, ‘https://api.github.com/users/remy’, ‘https://api.github.com/users/jeresig’ ]; // map every url to the promise of the fetch let requests = urls. map(url => fetch(url)); // Promise. all waits until all jobs are resolved Promise. all(requests) .
How do I call multiple API in node?
Creating a simple Node. Js app where need to display data from two APIs, where both APIs returns multiple objects with an ID. Need to display data from both these APIs on a single page, and somehow need to fetch the data from the two API based on the ID.
Does Promise all maintain order?
One interesting thing about Promise. all is that the order of the promises is maintained. The first promise in the array will get resolved to the first element of the output array, the second promise will be a second element in the output array and so on.
What is Promise in REST API?
The JavaScript Promise object provides a way of monitoring their state and serves as a placeholder and container for the data they’ll eventually return — or not. …
What is the Promise API?
The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value. Note: This feature is available in Web Workers. To learn about the way promises work and how you can use them, we advise you to read Using promises first.
How to combine REST API calls with promises in Node.js?
All that’s being returned are either promises or data, once the promise has been fulfilled and the request has been made. The getUserRepos function that we will call next looks relatively familiar, but at line 13, a bit more complicated response handling starts.
How to use promise.all in an async function?
Using Promise.all () An async function to fetch data from an API typically looks like: async function fetchData() { const res = await axios.get(“./names.json”); console.log(res.data); } Here we utilize Axios, a promise-based HTTP client, to make an HTTP request to retrieve data in a local json file.
Which is the main interface of the promises API?
The interesting thing here is then, which is the main interface of the Promises API. Next, add code so that you have an easier time running and testing the code. (You should also go to your GitHub user settings and acquire a personal access token ). What is happening here is that we define a github object that serves as a holder for our token.
How to make REST API calls in JavaScript?
You can call this for testing from the command line like this: … At this point, all we do with the result is to log it. We are just getting started. This leads us to the first pattern: if you want to make one request, and then process the result using the response of the first request as input, just use then.