Core concepts, definitions, basic syntax, and first principles expected in round 1 screening.
http module.app.listen() on a port.const express = require('express');
const app = express();
app.listen(3000, () => console.log('Listening on 3000'));
req) and response (res) objects, end the request-response cycle, or call the next middleware in the stack.req (the request object), res (the response object), and next (a callback function to pass execution to the subsequent middleware).function myMiddleware(req, res, next) {
// Action code
next(); // Transfer control
}
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