To install all the dependencies listed in the package.json file, the ______ command should be used.

npm init
npm add
npm install
npm create

To install all the dependencies listed in the package.json file, you should use the npm install command. It reads the dependencies specified in package.json and installs them. The other options are not used for this specific purpose.

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In Sequelize, which method is commonly used to find a single instance from the database?

findAll()
findOne()
findSingle()
fetchOne()

In Sequelize, the commonly used method to find a single instance from the database is findOne(). This method retrieves the first matching record that meets the specified criteria. The other options, findAll(), findSingle(), and fetchOne(), do not represent the standard method for retrieving a single instance in Sequelize.

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In JavaScript, a for…in loop is used to iterate over the ________ of an object.

properties
values
methods
variables

In JavaScript, a for...in loop is used to iterate over the properties of an object. It is commonly used for object iteration, and it iterates through the keys or property names of an object.

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Which of the following is the correct way to declare a variable in JavaScript?

var x = 10;
x := 10;
int x = 10;
declare x = 10;

In JavaScript, variables can be declared using the var keyword. The other options are either used in different programming languages or are not valid syntax in JavaScript.

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Which of the following is the correct way to parse JSON in the body of a request in Express.js?

app.use(express.json())
app.use(body.parse())
app.use(request.json())
app.parse(json)

To parse JSON in the body of a request in Express.js, you should use app.use(express.json()). This middleware is used to parse JSON data in the request body. The other options do not represent the correct way to parse JSON in Express.js.

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When using ES6+ modules, the import statement must be at the ________ of the file.

bottom
middle
top
end

When using ES6+ modules, the import statement must be at the top of the file. This is because ES6+ modules have a strict structure, and imports are processed before the module's code is executed. Placing the import statement at the top ensures that the imported dependencies are available throughout the module.

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Which of the following is required to serve static files in an Express application?

express.static()
app.static()
serveStatic()
staticFiles()

In Express.js, the express.static() middleware is used to serve static files like HTML, CSS, and JavaScript files. This middleware is essential to handle static assets in an Express application. The other options are not valid methods for serving static files.

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What is the primary purpose of using ESLint in a JavaScript project?

Ensure code quality and enforce coding style
Execute JavaScript code
Debug JavaScript code
Optimize JavaScript code

ESLint is primarily used to ensure code quality and enforce coding style standards in a JavaScript project. It helps identify and fix coding style issues, potential bugs, and maintainability problems in your codebase.

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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.

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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.

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