Javascript rename file on download

Question

I want to be able to download a web file, but when the download dialog open, the filename is renamed.

Ex: File: http://<server>/<site>/test.txt

and when I click to download the file, download dialog open with the file name: test001.txt.

How can I achive that?

Answer 1

As InviS suggests, now there's a download attribute on links.

Example:

<a href="http://server/site/test.txt" download="test001.txt">Download Your File</a>

• spec
• article
• browser support (Chrome, FF, Opera, Android Browser >= 4.4.4 at the time of writing)

Answer 2

You can used the download attribute on a link tag <a href="http://server/site/test.txt" download="test001.txt">Download Your File</a>

However, when content-disposition header is set on the server response, it will ignore the download attribute and the filename will be set to the filename in the content-disposition response header

You can accomplish this using axios, or any other fetch by doing this:

const downloadAs = (url, name) => {
  Axios.get(url, {
    headers: {
      "Content-Type": "application/octet-stream"
    },
    responseType: "blob"
  })
    .then(response => {
      const a = document.createElement("a");
      const url = window.URL.createObjectURL(response.data);
      a.href = url;
      a.download = name;
      a.click();
    })
    .catch(err => {
      console.log("error", err);
    });
};

usage:

downloadAs('filedownloadlink', 'newfilename');

Note: if your file is large, it will look like it is not doing anything until the whole file has been downloaded, so make sure you show some message or some indication to the user to let them know it is doing something