Answers for "post js fetch"

fetch json post

(async () => {
  const rawResponse = await fetch('https://httpbin.org/post', {
    method: 'POST',
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({a: 1, b: 'Textual content'})
  });
  const content = await rawResponse.json();

  console.log(content);
})();

fetch post

// data to be sent to the POST request
let _data = {
  title: "foo",
  body: "bar", 
  userId:1
}

fetch('https://jsonplaceholder.typicode.com/posts', {
  method: "POST",
  body: JSON.stringify(_data),
  headers: {"Content-type": "application/json; charset=UTF-8"}
})
.then(response => response.json()) 
.then(json => console.log(json))
.catch(err => console.log(err));