How would you handle errors in a Node.js server?
Use try/catch in async route handlers, and a global error handler in Express with app.use(errorHandler). Unhandled errors crash the process, so always handle them.
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More FAQs in Node.js Server and HTTP Interview Questions With Answers
Use require('http') and http.createServer with a request listener. The listener receives request and response. Call response.end to finish the response, and listen on a port with server.listen.
request (IncomingMessage) is the incoming HTTP request with url, method, headers, and body as a readable stream. response (ServerResponse) is what you send back: status code, headers, and body via writeHead, write, and end.
The request body is a readable stream. Listen to 'data' for chunks and 'end' for completion. For JSON, concatenate chunks and JSON.parse. Express's json middleware does this automatically.
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