What would happen if you do not use the express.static middleware function for serving static files?
- Static files would be served by default.
- You cannot serve static files in Express.js.
- Express.js would throw an error.
- Static files would be served but with limited caching.
If you do not use the express.static middleware function to serve static files, Express.js would not be able to serve static files by default. You need this middleware to handle static file requests. The other options are incorrect because Express.js does have the capability to serve static files, but you need to configure it properly.
Which of the following responses to a preflight request will allow a browser to make a cross-origin call to upload a file?
- Access-Control-Allow-Origin: *
- Access-Control-Allow-Methods: POST
- Access-Control-Allow-Headers: Authorization
- Access-Control-Allow-Credentials: true
To enable cross-origin file uploads, you need to set Access-Control-Allow-Credentials to true, indicating that credentials like cookies are allowed. The other options are necessary but don't specifically address file uploads.
When using stubs, the main focus is on ______ rather than on verifying interactions between objects.
- State
- Behavior
- Structure
- Performance
When using stubs in testing, the main focus is on the state of the object, such as returning predefined values, rather than on verifying interactions between objects. Stubs are used to control the behavior of the object under test without asserting specific interactions.
The OpenID Connect protocol is an extension of ______ and is used for authentication as well as identity provisioning in web applications.
- OAuth 2.0
- SAML
- JWT
- LDAP
The OpenID Connect (OIDC) protocol is indeed an extension of OAuth 2.0. It is designed to provide identity and authentication services on top of OAuth 2.0, making it a powerful tool for web application security. SAML, JWT, and LDAP are different technologies with distinct purposes.
Which of the following is a correct way to declare a function in JavaScript?
- function myFunction() => { ... }
- func myFunction() { ... }
- def myFunction() { ... }
- myFunction => { ... }
In JavaScript, functions are declared using the function keyword, followed by the function name and parentheses. The correct syntax is function myFunction() { ... }. The other options are not valid ways to declare functions in JavaScript.
What is the main purpose of using 'describe' and 'it' blocks in Mocha?
- Defining Test Suites and Test Cases
- Creating HTML Elements
- Importing External Libraries
- Generating Random Numbers
In Mocha, 'describe' blocks are used for defining test suites or groups of related test cases, and 'it' blocks are used for specifying individual test cases. This helps in organizing and structuring your test suite, making it more readable and maintainable.
The global object in Node.js is similar to the ______ object in client-side JavaScript.
- window
- document
- navigator
- console
In Node.js, the global object is similar to the window object in client-side JavaScript. It provides access to global variables and functions across the Node.js application.
When using template engines like EJS or Pug with Express.js, the ______ method is used to render a view template.
- render
- send
- view
- generate
In Express.js, the render method is used to render a view template when using template engines like EJS or Pug. It takes the name of the view and an optional data object as parameters. The other options are not typically used for rendering view templates.
How can you optimize Sequelize queries to avoid retrieving unnecessary data from the database?
- Using the attributes option to specify only the required fields
- Using findAll without any options
- Using findOne for all queries
- Using SELECT * for all queries
To optimize Sequelize queries, you can use the attributes option to specify only the fields you want to retrieve. Using findAll without options would retrieve all fields, which is inefficient. Using findOne is not suitable for all queries, and using SELECT * would retrieve all fields.
What is the primary use of the File System (fs) module in Node.js?
- Manipulating and interacting with files and directories
- Parsing JSON data
- Creating web servers
- Handling user input
The primary use of the File System (fs) module in Node.js is for manipulating and interacting with files and directories. It provides methods for reading, writing, updating, and deleting files, as well as working with directories.