Express Flashcards

1
Q

How do you add express to your package dependencies?

A

Npm innit -yes then npm install express

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2
Q

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

A

Listen method
app.listen(3000, () => {
console.log(‘Express server listening on port 3000’);
});

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3
Q

How do you mount a middleware with an Express application?

A

Pass it a callback function that has parameters response and next. Call use to install middleware

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4
Q

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

A

Req (request) and res (response) and next

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5
Q

What is the appropriate Content-Type header for HTTP messages that contain JSON in their bodies?

A

application/json

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6
Q

What is the significance of an HTTP request’s method?

A

indicate the desired action to be performed for a given resource

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7
Q

What does the express.json() middleware do and when would you need it?

A

Method to recognize the incoming Request Object as a JSON Object

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8
Q

What does express.static() return?

A

Returns a middleware that serves static files

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9
Q

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

A

directory name of the current module

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10
Q

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

A

joins the specified path segments into one path

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