<ul><li>Cross-Origin Resource Sharing (CORS) errors are common in web development due to strict browser security policies.</li><li>Key CORS errors include missing Access-Control-Allow-Origin header, preflight request failure, and multiple origin values in header.</li><li>Solutions involve using the cors package in Express, explicitly handling OPTIONS method, and ensuring CORS headers are set only once.</li><li>Understanding CORS enforcement by browsers and configuring the server correctly is crucial for seamless integrations between frontend and backend services.</li></ul>

How to fix CORS errors in Node.js

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