What is the basic syntax of the fetch() function?

Calling fetch(url, options) returns a Promise that resolves to a Response object once the headers arrive.

const response = await fetch('/api/users', {
  method: 'GET',
  headers: { 'Accept': 'application/json' }
});

The options parameter is optional for simple GET requests. The Promise resolves even for HTTP error status codes (404, 500) - you must check response.ok.

Go deeper:

• MDN: Window.fetch() — the reference for the signature, return value, and why it only rejects on network errors.
• MDN: Using the Fetch API — guide covering requests, headers, credentials, cancellation, and reading responses.