Downloading files from expressJS (sendFile) server to VueJS, is returning corrupted files?

Question

I have an API written in expressjs, that sends a file when provided with a fileID.

The backend is working fine, as it sends the correct file (uncorrupted) when the route url is typed directly int the browser. ex. http://localhost:8080/download?id=1234 (downloads all files just fine ie.txt, xlsx, jpg, zip)

My express route actually uses res.download, which is really jsut a wrapper for sendFile.

When I try calling these route urls from a Vue http get request, it only returns txt files uncorrupted. All other files download, but they can be opened, due to corruption.

Can anyone please point me in the right direction as to why its not working in Vue?

For clarity, "item" is passed as an argument to this function.

        this.$http.get("http://localhost:8000/files/download", {params:{id:item._id}}, {responseType: 'arraybuffer'})
      .then(response => {

        var blob = new Blob([response.data], {type:response.headers.get('content-type')});

        var link = document.createElement('a');
        link.href = window.URL.createObjectURL(blob);
        link.download = item.filename;
        link.click();
      })

For reference, this is my express route

Answer 1

Shout out to @Helpinghand for helping me troubleshoot this.

"I found the solution within the link you posted. The problem is that i was explicitly sending params in its own object before assigning "content-type". The example you posted concatenates the query params to the url. After making this switch, its working perfectly".

this.$http.get(`http://localhost:8000/files/download?id=${item._id}`, {responseType: 'arraybuffer'})
      .then(response => {
        console.log(response.headers.get('content-type'));
        console.log(response);

        var blob = new Blob([response.body], {type:response.headers.get('content-type')});

        var link = document.createElement('a');
        link.href = window.URL.createObjectURL(blob);
        link.download = item.filename_version;
        link.click();
      })