Update 2021:
i tried `url.format` and `querystring` and both of them are deprecated, instead we can use `URLSearchParams`

 const {URLSearchParams} = require('url')
 
 app.get('/category', (req, res) =>{
 const pathname = '/?'
 const components ={
 a:"a",
 b:"b"
 }
 
 const urlParameters = new URLSearchParams(components)
 res.redirect(pathname + urlParameters)
 })