How to Use the JavaScript Fetch API to Get Data
fetch('http://api.steampowered.com/ISteamUserStats/GetGlobalAchievementPercentagesForApp/v0002/?gameid=221380')
.then(function(response) {
return response.json();
})
.then(function(myJson) {
console.log(JSON.stringify(myJson));
});js function return fetch result
function getvals(){
return fetch('https://jsonplaceholder.typicode.com/posts',
{
method: "GET",
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json',
},
})
.then((response) => response.json())
.then((responseData) => {
console.log(responseData);
return responseData;
})
.catch(error => console.warn(error));
}
getvals().then(response => console.log(response));how to use fetch() javascript
//Most API's will only allow you to fetch on their website.
//This means you couldn't run this code in the console on
// google.com because:
// 1. Google demands the fetch request be from https
// 2. open-notify's API blocks the request outside of their website
fetch('http://api.open-notify.org/astros.json')
.then(function(response) {
return response.json();
})
.then(function(json) {
console.log(json)
});
// Here is another example. A method (function) that
// grabs Game of Thrones books from an API ...
function fetchBooks() {
return fetch('https://anapioficeandfire.com/api/books')
.then(resp => resp.json())
.then(json => renderBooks(json));
}
function renderBooks(json) {
const main = document.querySelector('main')
json.forEach(book => {
const h2 = document.createElement('h2')
h2.innerHTML = `<h2>${book.name}</h2>`
main.appendChild(h2)
})
}
document.addEventListener('DOMContentLoaded', function() {
fetchBooks()
})javascript fetch mehtod
//feth method
// - take the url as parameter
// - return a promise
// - pass response when resolved
// - pass error when rejected
// - the response has the http response information
// - use the .json() is used to get the body of the response
// - .json return a promise
// - resolve the promise with data as the argument
fetch("test.json")
.then(response =>{
return response.json();
}).then(data=>{
document.body.innerHTML = data.name;
console.log(data)
}).catch(error =>{
console.error(error)
})How to use fetch api
async function fetchText() {
let response = await fetch('/readme.txt');
let data = await response.text();
console.log(data);
}Code language: JavaScript (javascript)Copyright © 2021 Codeinu
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