In a token-based authentication system, using a ______ approach helps in reducing the risk of token interception and replay attacks.
- Stateless
- Stateful
- Hybrid
- Cookie-based
In a token-based authentication system, a "stateless" approach is used to reduce the risk of token interception and replay attacks. Stateful approaches require server-side storage, while stateless approaches are based on self-contained tokens, which do not rely on server-side storage, making them more secure.
When a JavaScript function is executed, a new execution context is created, and a special object called ________ is created.
- "this"
- "global"
- "function"
- "execution"
When a JavaScript function is executed, a new execution context is created, and a special object called the "execution context" is created. This execution context contains information about the function's variables and scope.
What is the significance of the HTTP status code in the response of an Express API, and how does it affect client-server interaction?
- HTTP status codes are optional and don't impact client-server interaction
- HTTP status codes indicate the type of response and guide client behavior
- HTTP status codes are primarily for server documentation
- HTTP status codes are used to encrypt the API response
HTTP status codes are essential in the response of an Express API. They indicate the type of response and guide client behavior. For example, a 200 OK status indicates success, while a 404 Not Found status indicates a resource was not found. Proper status codes enhance communication and handling between the client and server.
Connection to a NoSQL database like MongoDB in Node.js usually returns a ______ object.
- MongoClient
- Promise
- HttpServer
- Buffer
When connecting to a NoSQL database like MongoDB in Node.js, you typically get a MongoClient object. This object represents the database connection and allows you to perform various database operations. The other options are not related to MongoDB connections.
Which method should be used to handle the rejection of a Promise?
- reject()
- catch()
- error()
- failure()
To handle the rejection of a Promise, you should use the catch() method. It allows you to specify what to do when the Promise is rejected with an error. The other options are not standard methods for handling Promise rejection in JavaScript.
A common practice for improving error handling in Express.js is to centralize error handling using a ______.
- try-catch block
- catchError middleware
- globalErrorHandler middleware
- throw statement
A common practice for improving error handling in Express.js is to centralize error handling using a globalErrorHandler middleware. This middleware is responsible for handling errors that occur during request processing. While try-catch blocks can be used within routes, they don't centralize error handling, and catchError and throw are not standard middleware constructs in Express.js.
You are tasked with developing a system to read and process large files without consuming a lot of memory. How would you utilize streams in Node.js to efficiently read, process, and write the data?
- Use a Readable stream to read the file in chunks, process data asynchronously, and then write to a Writable stream.
- Read the entire file into memory, process it, and then write it back to disk.
- Use a synchronous file reading approach to minimize memory usage.
- Use a single callback function to read and process the entire file sequentially.
To efficiently process large files, you should use a Readable stream to read the file in chunks, process data asynchronously, and then write to a Writable stream. This approach minimizes memory usage and is ideal for handling large files in Node.js.
What is the significance of implementing Multi-Factor Authentication (MFA) in web applications?
- MFA adds an extra layer of security by requiring users to provide multiple forms of authentication, such as a password and a fingerprint scan.
- MFA simplifies the authentication process by reducing the number of login attempts.
- MFA is primarily used for tracking user behavior and analytics.
- MFA is only useful for protecting against physical security threats.
Implementing Multi-Factor Authentication (MFA) is significant in web applications as it adds an extra layer of security by requiring users to provide multiple forms of authentication, making it harder for unauthorized users to gain access even if they have the user's password. MFA enhances security and helps protect user accounts from various online threats.
In Express.js, to skip the remaining route callbacks and pass control to the next middleware function, you can call the ______ function.
- next()
- skip()
- pass()
- continue()
In Express.js, the next() function is used to skip the remaining route callbacks within a middleware function and pass control to the next middleware function in the chain. The other options are not valid functions for this purpose.
What type of object is passed as the first argument to the request listener function when creating an HTTP server?
- request
- response
- server
- http
The first argument passed to the request listener function when creating an HTTP server is the request object. This object contains information about the incoming HTTP request, such as headers, URL, and HTTP method. It allows you to read and process client requests.