What is CORS and why do you need it?
Model answer
Browsers block a web page from reading responses from a different origin unless the server allows it with CORS headers. If your React app on one origin calls your API on another, add the cors package with an allowed origin list. CORS protects users in browsers. It is not an authentication or server security feature.
Learn this topic
Express Middleware Explained: next(), Logging and express.json() in the course Node.js and Express: Build a Back End API from Scratch.
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