1let data = {element: "barium"};
2
3fetch("/post/data/here", {
4  method: "POST", 
5  body: JSON.stringify(data)
6}).then(res => {
7  console.log("Request complete! response:", res);
8});
9
10
11// If you are as lazy as me (or just prefer a shortcut/helper):
12
13window.post = function(url, data) {
14  return fetch(url, {method: "POST", body: JSON.stringify(data)});
15}
16
17// ...
18
19post("post/data/here", {element: "osmium"});
20

1const postData = async ( url = '', data = {})=>{
2    console.log(data);
3      const response = await fetch(url, {
4      method: 'POST', 
5      credentials: 'same-origin',
6      headers: {
7          'Content-Type': 'application/json',
8      },
9     // Body data type must match "Content-Type" header        
10      body: JSON.stringify(data), 
11    });
12
13      try {
14        const newData = await response.json();
15        console.log(newData);
16        return newData;
17      }catch(error) {
18      console.log("error", error);
19      }
20  }
21