Express

Question 1

What is Express?

Answer 1

Express is a routing and middleware web framework for Node.js that has minimal functionality of its own: An Express application is essentially a series of middleware function calls.

Question 2

How do you add express to your package dependencies?

Answer 2

npm install express

Question 3

What Express application method binds the server to a network PORT?

Answer 3

app.listen([port[, host[, backlog]]][, callback])

Question 4

How do you register a middleware with an Express application?

Answer 4

app.use([path,] callback [, callback…])

Question 5

Which objects does an Express application pass to your middleware to manage the request/response lifecycle of the server?

Answer 5

request object, response object, and the next middleware

Question 6

What is the Content-Type header of HTTP requests and responses used for?

Answer 6

The Content-Type entity header is used to indicate the media type of the resource.

Question 7

What does express.static() return?

Answer 7

Express.static() serves static files contained in the root directory

Syntax: express.static(root, [options])

Question 8

What is the local __dirname variable in a Node.js module?

Answer 8

A string of the absolute path of the current module directory

Question 9

What does the join() method of Node’s path module do?

Answer 9

The path.join() method joins all given path segments together using the platform-specific separator as a delimiter, then normalizes the resulting path.

Syntax: path.join([…paths])

Example: path.join('/foo', 'bar', 'baz/asdf', 'quux', '..');
// Returns: '/foo/bar/baz/asdf'