Setting Up CORS and Web Application Security Headers // NodeFlux Docs

Configure Cross-Origin Resource Sharing (CORS) and Helmet security headers on Node.js web services. ## Steps 1. Install cors and helmet packages in your Node.js project. 2. Configure CORS middleware with whitelist: app.u NodeFlux documentation for free Minecraft, Node.js and application hosting.

Configure Cross-Origin Resource Sharing (CORS) and Helmet security headers on Node.js web services. ## Steps 1. Install cors and helmet packages in your Node.js project. 2. Configure CORS middleware with whitelist: app.u

Configure Cross-Origin Resource Sharing (CORS) and Helmet security headers on Node.js web services. ## Steps 1. Install cors and helmet packages in your Node.js project. 2. Configure CORS middleware with whitelist: app.use(cors({ origin: "https://my-website.com" })); 3. Avoid setting origin: "*" on APIs handling authenticated user cookies or authorization tokens. 4. Use helmet middleware to inject standard security headers (X-Frame-Options, Content-Security-Policy). 5. Test OPTIONS preflight requests from browser dev tools to verify HTTP 204 response status. 6. Deploy updated project to your NodeFlux application service. ## Notes - CORS security policies are enforced by browser clients, not by server-to-server HTTP calls. - Proper CORS configuration prevents malicious third-party websites from executing unauthorized user API requests.