Security implications of cross-origin resource sharing (CORS) in Node.js

1

ExpressJS

In this section, we’ll walk through a secure implementation of CORS in a Node.js application. We’ll consider a simple Node.js application using Express.js as its web framework. It will serve as an API for a hypothetical online bookstore.

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Const allowedOrigins = ['https://example.com', 'https://another-example.com', 'https://www.google.com']; CorsOptions.origin = (origin, callback) => { if (allowedOrigins.includes(origin)) { callback(null, true); } else { callback(new Error('Not allowed by CORS')); } }; App.get('books/', cor(corsOptions), (req,res) => { /* ... */ }).

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3

Brave

When you restart the server and rerun the fetch command in the developer console, it should work as expected. If you find you’re still getting the error you may need to try running the script in a different browser. For the fetch command to work on Brave browser, you will need to disable Shields. Please note that the current CORS configuration may fail when using Safari browser. This is a result of Safari's strict enforcement of the Same-Origin Policy (SOP), which restricts requests from different origins.

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