Untitled Quiz

Use try/catch blocks or .catch() to handle potential errors in asynchronous function calls.

The 'error' event is emitted when an error happens in Node.js Event Emitters.

Use emitter.removeAllListeners() to remove all listeners for an event.

The app.listen() method starts an Express server to accept HTTP requests.

Define a route to handle GET requests using app.get('/path', callback)

Use the cookie-parser middleware for handling cookies in Express.js.

Use .env files to manage environment variables in Node.js projects.

Sanitize untrusted input to prevent security vulnerabilities in Node.js.

Use emitter.emit('eventName', data) to dispatch a custom event in Node.js.

The process.on('uncaughtException', callback) method handles unexpected errors.

Use app.use((req, res, next) => { res.status(404).send('Not Found'); }); to handle 404 errors.

app.all() defines a handler for all HTTP methods (GET, POST, etc.) for a given path in Express.

app.use(express.urlencoded({ extended: true })) parses URL-encoded form data in Express.

A system where each action is triggered by time-based intervals.

A system where events are checked in a loop for each iteration.

Use environment variables to store sensitive information during production deployments.

This method in Node.js allows you to run multiple asynchronous operations concurrently, waiting for all of them to complete before proceeding.

An event emitter is a fundamental object in Node.js that allows you to create and subscribe to custom events, triggering specific actions when those events occur.

If an event is emitted but no listeners are attached to it in Node.js, nothing happens. The event simply passes by.

You can remove a listener from an event emitter using either emitter.removeListener(event, listener) or emitter.off(event, listener). Both methods achieve the same result.

The app.use(express.static()) method is used in Express.js to serve files from a specified directory, making them accessible to clients.

Express.js uses the app.post() method to handle HTTP POST requests, allowing clients to send data to the server.

Errors in Express.js are typically handled using a four-argument middleware function in app.use(), which provides a way to catch errors, log them, and send appropriate responses.

The most important best practice is to propagate errors to higher-level handlers, allowing for centralized logging and reporting, rather than simply catching and ignoring them.