Validate Request Body variables through Swagger and Express - node.js

Question

I am currently using Swagger (2.0) on Node.js. My YAML file validates correctly and the requests are going through. My particular call has a request body using the following format -
{
"postalCode": "invalidpostalcode",
"phone": "invalidnumber",
"website": "invalidwebsite"
}
I would like to validate each body variable before continuing to the next piece of code. To accomplish validating the data I would like to use validator.js.
Now my basic validation code looks something like that -
if(!validator.isURL(req.body.website)){
var tmp = {
"message": req.__('error.url', {
field: req.body.website
})
}
res.status(400).json(tmp);
return;
}
if(!validator.isPostalCode(req.body.postalCode,'any')){
var tmp = {
"message": req.__('error.postalCode', {
field: req.body.postalCode
})
}
res.status(400).json(tmp);
return;
}
Is there there any better way to validate data sent in through the API that would require less code? For example by using a function to control the majority of the logic?
while this is one example of the endpoint I will have some in the future that will require upwards of 20 body parameters.
I have tried create a function that will return the response code. However, that returns an error Cannot set headers after they are sent to the client.