Fetch API in JavaScript

Fetch API in JavaScript — a practical guide to JavaScript Fetch API with clear examples you can reuse in real projects.

JavaScript Tutorial Series (85/101). Prefer one article? Read the complete JavaScript tutorial.

Short description

Check res.ok; set headers/body for POST/JSON.

Fetch POST

const res = await fetch('/api/items', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ name: 'Book' }),
});