using fetch in javascript

//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 API var myData = async () => { try { const raw_response = await fetch("https://jsonplaceholder.typicode.com/users"); if (!raw_response.ok) { // check for the 404 errors throw new Error(raw_response.status); } const json_data = await raw_response.json(); console.log(json_data); } catch (error) { // catch block for network errors console.log(error); } } fetchUsers();

// GET Request. fetch('https://jsonplaceholder.typicode.com/users') // Handle success .then(response => response.json()) // convert to json .then(json => console.log(json)) //print data to console .catch(err => console.log('Request Failed', err)); // Catch errors

const url = 'http://api.open-notify.org/astros.json' const fetchurl = (url:string):void=>{ fetch(url).then(res=>res.json()).then(jsonRes=>{ console.log(jsonRes) }) } fetchurl(url)

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

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