Express JS Express Request and Response

Question 1

Which property of the request object contains the parsed body of a POST request with JSON content?

Accepted Answer

req.body

Answer

req.data

Answer

req.payload

Answer

req.content

Question 2

How do you send a JSON response in Express?

Accepted Answer

res.json(data)

Answer

res.send(JSON.stringify(data))

Answer

res.write(data)

Answer

res.json = data

Question 3

Which method sets the HTTP status code of a response in Express?

Accepted Answer

res.status(code)

Answer

res.code(code)

Answer

res.httpStatus(code)

Answer

res.setStatus(code)

Question 4

How do you retrieve the value of the 'Authorization' request header in Express?

Accepted Answer

req.get('Authorization') or req.headers['authorization']

Answer

req.header.Authorization

Answer

req.headers.Authorization

Answer

req.getHeader('Authorization')

Question 5

What is the difference between res.send() and res.end() in Express?

Accepted Answer

res.send() sets headers and body; res.end() is lower-level and sends no body by default

Answer

They are identical

Answer

res.end() sets JSON content type

Answer

res.send() is deprecated

Question 6

How do you redirect a client to a different URL in Express?

Accepted Answer

res.redirect(url)

Answer

res.location(url)

Answer

res.goto(url)

Answer

res.forward(url)