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Questions and Answers

What method in Express.js can be used to define a handler for all HTTP methods for a specific path?

app.route(path).handler()

app.use(path, handler)

app.method(path, handler)

app.all(path, handler) (correct)

What is a recommended method for managing sensitive data in a Node.js application?

Storing sensitive information in JSON configuration files

Using environment variables for sensitive information (correct)

Hardcoding sensitive information within the application code

Logging sensitive information with console.log()

Which of the following is NOT a correct way to handle uncaught exceptions in a Node.js application?

process.on('uncaughtException', callback)

try...catch blocks within routes

process.on('exception', callback) (correct)

process.on('unhandledRejection', callback)

What is the function of the express.urlencoded() middleware in an Express application?

To parse URL-encoded bodies from forms Signup and view all the answers

Which HTTP status code is commonly used to indicate a 404 error in an Express.js application?

404 Signup and view all the answers

When emitting a custom event in Node.js, what is the correct method to use with an EventEmitter?

emitter.emit(eventName, data) Signup and view all the answers

What is the correct way to respond to a 'Not Found' error in Express?

app.use((req, res) => res.status(404).send('Not Found')) Signup and view all the answers

What should be done to securely log information in production for a Node.js application?

Log only error messages to a secure log system Signup and view all the answers

Which HTTP method in Express.js is specifically designed to handle creating new resources?

app.post() Signup and view all the answers

What is a recommended practice for managing configuration settings in a Node.js application?

Use environment variables for configuration. Signup and view all the answers

Which of the following is a standard tool for testing Node.js applications?

Jest Signup and view all the answers

How can you securely manage user session data in a Node.js application?

Utilize secure, HttpOnly cookies. Signup and view all the answers

What is the purpose of using middleware in Express.js routing?

To manipulate the request and response objects. Signup and view all the answers

Which method would you use to remove a listener from an event emitter in Node.js?

emitter.off(event, listener) Signup and view all the answers

Which practice should be avoided when handling errors in Node.js applications?

Suppressing errors to prevent crashes. Signup and view all the answers

Which method is used in Express.js to serve static files from a directory?

express.static() Signup and view all the answers

What is the correct way to define a route for handling GET requests at the /home path in an Express application?

app.get('/home', function(req, res) {...}) Signup and view all the answers

What is the function of a .env file in Node.js applications?

To manage environment variables Signup and view all the answers

What best practice should be followed when dealing with untrusted data in Node.js applications?

Always sanitize input to prevent security vulnerabilities Signup and view all the answers

In Express.js, which middleware is typically used for parsing cookies?

cookie-parser Signup and view all the answers

What will the method app.listen() achieve in an Express application?

Starts a web server that listens for incoming HTTP requests Signup and view all the answers

Which event is emitted when an error occurs in Node.js Event Emitters?

error event Signup and view all the answers

What is the purpose of using the publisher-subscriber pattern in Node.js?

To allow a single event source to send messages to multiple listeners Signup and view all the answers

Which method is used to remove all listeners for a specific event in Node.js?

emitter.removeAllListeners() Signup and view all the answers

Study Notes

Node.js Study Notes

Node.js Use Cases: Primarily used for backend development.
Node.js Language: Uses JavaScript.
Node.js Runtime Environment: Based on V8.
I/O Handling: Handles I/O operations asynchronously.
NPM Keyword: Use require to import modules.
module.exports: Exports functions to other modules.
HTTP Server Module: The http module is used for creating HTTP servers.
NPM Purpose: Node Package Manager for managing packages.
Global NPM Installation: Use npm install -g <package> to install a package globally.
Project Dependencies: Stored in package.json.
Async Operation Function: setTimeout is used for scheduling one-time delays.
Promises: Represent the eventual result of asynchronous operations.
Async Functions: await pauses execution until a Promise is resolved.
Event Loop: Manages asynchronous operations.
Node.js Features: Single-threaded, event-driven architecture, asynchronous I/O
Express.js Function: app.get() is used to create routes in Express.js.
Best Practice: Uses asynchronous patterns.
Production Logging: Use structured logging.
WebSocket Protocol: WebSocket uses ws:// protocol not HTTP.
WebSocket Purpose: Real-time, two-way communication.
Express Middleware Role: Execute before route handlers.
JSON Parsing Middleware: express.json() parses JSON payloads.
Error Handling Middleware: Use middleware functions to handle errors globally
Node.js Project Structure: Use modularized code with separated files for routes, models, and other parts of the project.
Sensitive Data Handling: Use environment variables (dotenv).
Asynchronous Operations in Node.js: Use async/await for improved error handling and readability
Common Libraries: http is for working with HTTP. fs handles files. os for OS related tasks.
Stream Types: readable, writable, duplex, and transform.
Reading File Synchronously: fs.readFileSync().
Writing File Asynchronously: fs.writeFile().
Global Installation: Use npm install -g <package> for global installations .
Reading File Asynchronously: The fs module's asynchronous readFile() method.

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Questions and Answers

What method in Express.js can be used to define a handler for all HTTP methods for a specific path?

What is a recommended method for managing sensitive data in a Node.js application?

Which of the following is NOT a correct way to handle uncaught exceptions in a Node.js application?

What is the function of the express.urlencoded() middleware in an Express application?

Which HTTP status code is commonly used to indicate a 404 error in an Express.js application?

When emitting a custom event in Node.js, what is the correct method to use with an EventEmitter?

What is the correct way to respond to a 'Not Found' error in Express?

What should be done to securely log information in production for a Node.js application?

Which HTTP method in Express.js is specifically designed to handle creating new resources?

What is a recommended practice for managing configuration settings in a Node.js application?

Which of the following is a standard tool for testing Node.js applications?

How can you securely manage user session data in a Node.js application?

What is the purpose of using middleware in Express.js routing?

Which method would you use to remove a listener from an event emitter in Node.js?

Which practice should be avoided when handling errors in Node.js applications?

Which method is used in Express.js to serve static files from a directory?

What is the correct way to define a route for handling GET requests at the /home path in an Express application?

What is the function of a .env file in Node.js applications?

What best practice should be followed when dealing with untrusted data in Node.js applications?

In Express.js, which middleware is typically used for parsing cookies?

What will the method app.listen() achieve in an Express application?

Which event is emitted when an error occurs in Node.js Event Emitters?

What is the purpose of using the publisher-subscriber pattern in Node.js?

Which method is used to remove all listeners for a specific event in Node.js?

Study Notes

Node.js Study Notes

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