Multiple fields with same key in query params (axios request)?

Question

So the backend (not under my control) requires a query string like this:

http://example.com/?foo=5&foo=2&foo=11

But axios

Answer 1

If one uses the ready URLSearchParams the handling of multiple parameter values with the same name works with axios as well ... I guess the support for IE came in 2017 ... Works on Safari too, although the links claims that it might not ..

function getUrlParams(){
        // handles multiple param values with the same name
        var url_params = new URLSearchParams(); 

        if( window.location.toString().indexOf("?") != -1) {
           window.location.search.split('?')[1].split('#')[0]
              .replace(/([^=&]+)=([^&]*)/g, function(m, key, value) {
              var attr = decodeURIComponent(key)
              var val = decodeURIComponent(value)
              url_params.append(attr,val);
           });
        } else {
           // create a default set of params - you might not need this one ...
           url_params = { some_param:"some_value" };
        }
        return url_params ;
     }


     function getBackEndData(url_params, back_end_url){
           // the replace is just a fancy way of converting front-end to back-end call
           return axios.get( back_end_url , { params: url_params } )
           .then(response => {
              return response.data ;
           })
           .catch(function(error) {
              return error.response ; 
              console.log(error.response.data);
           })
     }