Fetch API

GET

  fetch('https://jsonplaceholder.typicode.com/posts')
        .then((res) => {
            res.json().then((result) => {
                console.log(result)
            })
        })
        .catch(err=> console.error(err));

POST

        var data = {
          title: 'Test Title',
          body: 'Test body ....'
        };

        fetch('https://jsonplaceholder.typicode.com/posts', {
            method: 'POST', // or 'PUT'
            body: JSON.stringify(data), // data can be `string` or {object}!
            headers:{
              'Content-Type': 'application/json'
            }
          }).then(res => res.json())
          .then(response => console.log('Success:', JSON.stringify(response)))
          .catch(error => console.error('Error:', error));