REST API Integration with JavaScript

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

JavaScript Tutorial Series (87/101). Prefer one article? Read the complete JavaScript tutorial.

Short description

Centralize base URL, auth headers, and JSON parsing.

API client sketch

async function api(path, options = {}) {
  const res = await fetch(`/api${path}`, {
    headers: { 'Content-Type': 'application/json', ...(options.headers || {}) },
    ...options,
  });
  if (!res.ok) throw new Error(`HTTP ${res.status}`);
  return res.json();
}