Send URL-Encoded Form

Send form data as application/x-www-form-urlencoded using URLSearchParams.

Code

Utilities

const params = new URLSearchParams();
params.append('username', 'john');
params.append('password', 'secret123');
params.append('remember', 'true');

const response = await fetch('https://httpbin.org/post', {
  method: 'POST',
  headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
  body: params
});
await response.json();

Browser·fetch() may be limited by CORS

When to Use

HTML form submissions
OAuth token requests
Legacy APIs expecting form data
Simple key-value data without files

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