request.body vs request.params vs request.query

Question

I have a client side JS file that has:

agent = require('superagent'); request = agent.get(url);

Then I have something like

request.get(url) 
//or
request.post(url)
request.end( function( err, results ) {
        resultCallback( err, results, callback );
    } );

On the backend Node side I have request.body and request.params and some has request.query

What are the difference between the body, params and query?

Solution

req.params is route parameters, req.body is the actual body of the request, and req.query is any query parameters.

For example, if I declare this route:

router.get('/user/:id', function(req, res) {});

req.params will contain id.

If I pass a body to this route:

{
  name: 'josh'
}

This will be in req.body.

If I pass some query parameters to http://myserver.com/api/user?name="josh", req.query will be { name: 'josh' }.

Check out the Express docs.