fetch POST

Create a resource: method POST, JSON body, Content-Type header.

POST usually sends a body. Build a JS object, turn it into a string with JSON.stringify (Phase 3), set Content-Type: application/json, and pass method: "POST". JSONPlaceholder echoes a fake created post. 

Server echo appears here.

Create a post via POST + JSON.

Important JavaScript

const payload = { title: "Scout", body: "Notes", userId: 1 };

const response = await fetch(
  "https://jsonplaceholder.typicode.com/posts",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(payload)
  }
);
if (!response.ok) {
  throw new Error("HTTP " + response.status);
}
const created = await response.json();