const response = await fetch('/api/data');

response.json();        // Parse as JSON
response.text();        // Parse as plain text
response.blob();        // Parse as binary blob (images, files)
response.formData();    // Parse as FormData
response.arrayBuffer(); // Parse as ArrayBuffer

// Response properties
response.status;       // 200, 404, 500, etc.
response.ok;           // true if status 200-299
response.headers;      // Headers object
response.url;          // The response URL

// JSON API
const user = await fetch('/api/user/1').then(r => r.json());

// HTML or text
const html = await fetch('/template.html').then(r => r.text());

// Image
const blob = await fetch('/image.png').then(r => r.blob());
const imgUrl = URL.createObjectURL(blob);