Flatten a javascript object to pass as querystring

Question

I have a javascript object that I need to flatten into a string so that I can pass as querystring, how would I do that? i.e:

{ cost: 12345, insertBy: \'testUse

Answer 1

Another version:

function toQueryString(obj) {
    return Object.keys(obj).map(k => {
      return encodeURIComponent(k) + "=" + encodeURIComponent(obj[k])
    })
    .join("&");
}