Difference between res.setHeader and res.header in node.js

Question

What is the difference between res.setHeader and res.header. Which one should be used for enabling CORS? In some pages res.header is used and some pages res.setHeader is use

Answer 1

res.setHeader() is a native method of Node.js and res.header() is an alias of res.set() method from Express framework.

Documentation: res.setHeader(), res.set()

This two methods do exactly the same thing, set the headers HTTP response. The only difference is res.setHeader() allows you only to set a singular header and res.header() will allow you to set multiple headers. So use the one fit with your needs.