Res Send

Send a response.

res.send(Buffer.from('whoop'))
res.send({ some: 'json' })
res.send('<p>some html</p>')
res.send(404, 'Sorry, we cannot find that!')
res.send(500, { error: 'something blew up' })
res.send(200)

This method performs a myriad of useful tasks for simple non-streaming responses such as automatically assigning the Content-Length unless previously defined and providing automatic <em>HEAD</em> and HTTP cache freshness support.

When a Buffer is given the Content-Type is set to "application/octet-stream" unless previously defined as shown below:

res.set('Content-Type', 'text/html')
res.send(Buffer.from('<p>some html</p>'))

When a String is given the Content-Type is set defaulted to "text/html":

res.send('<p>some html</p>')

When an Array or Object is given Express will respond with the JSON representation:

res.send({ user: 'tobi' })
res.send([1, 2, 3])

Finally when a Number is given without any of the previously mentioned bodies, then a response body string is assigned for you. For example 200 will respond will the text "OK", and 404 "Not Found" and so on.

res.send(200)
res.send(404)
res.send(500)