check current express framework version

• check current node js express framework version

npm info express version to fetch the latest version
 it's preferred that you do this instead of "3.x" below to prevent any future surprises.

package.json

{
  "name": "hello-world",
  "description": "hello world test app",
  "version": "0.0.1",
  "private": true,
  "dependencies": {
    "express": "3.x"
  }
}