fetch data

//Obj of data to send in future like a dummyDb const data = { username: 'example' }; //POST request with body equal on data in JSON format fetch('https://example.com/profile', { method: 'POST', headers: { 'Content-Type': 'application/json', }, body: JSON.stringify(data), }) .then((response) => response.json()) //Then with the data from the response in JSON... .then((data) => { console.log('Success:', data); }) //Then with the error genereted... .catch((error) => { console.error('Error:', error); }); // Yeah

fetch('http://api.steampowered.com/ISteamUserStats/GetGlobalAchievementPercentagesForApp/v0002/?gameid=221380') .then(function(response) { return response.json(); }) .then(function(myJson) { console.log(JSON.stringify(myJson)); });

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()
})

Posted by: Guest on March-30-2020

var myHeaders = new Headers(); var myInit = { method: 'POST', headers: myHeaders, mode: 'cors', cache: 'default' }; fetch('flowers.jpg',myInit) .then(function(response) { return response.blob(); }) .then(function(myBlob) { var objectURL = URL.createObjectURL(myBlob); myImage.src = objectURL; });

var formData = new FormData(); var fileField = document.querySelector("input[type='file']"); formData.append('username', 'abc123'); formData.append('avatar', fileField.files[0]); fetch('https://example.com/profile/avatar', { method: 'PUT', body: formData }) .then(response => response.json()) .catch(error => console.error('Error:', error)) .then(response => console.log('Success:', response));

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