res.send()

res.send([body])

Sends the HTTP response.

The body parameter can be a Buffer object, a String, an object, or an Array. For example:

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

This method performs many useful tasks for simple non-streaming responses: For example, it automatically assigns the Content-Length HTTP response header field (unless previously defined) and provides automatic HEAD and HTTP cache freshness support.

When the parameter is a Buffer object, the method sets the Content-Type response header field to “application/octet-stream”, unless previously defined as shown below:

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

When the parameter is a String, the method sets the Content-Type to “text/html”:

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

When the parameter is an Array or Object, Express responds with the JSON representation:

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