How to handle file downloads with JWT based authentication?

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Here’s a way to download it on the client using the download attribute, the fetch API, and URL.createObjectURL. You would fetch the file using your JWT, convert the payload into a blob, put the blob into an objectURL, set the source of an anchor tag to that objectURL, and click that objectURL in javascript.

let anchor = document.createElement("a");
document.body.appendChild(anchor);
let file="https://www.example.com/some-file.pdf";

let headers = new Headers();
headers.append('Authorization', 'Bearer MY-TOKEN');

fetch(file, { headers })
    .then(response => response.blob())
    .then(blobby => {
        let objectUrl = window.URL.createObjectURL(blobby);

        anchor.href = objectUrl;
        anchor.download = 'some-file.pdf';
        anchor.click();

        window.URL.revokeObjectURL(objectUrl);
    });

The value of the download attribute will be the eventual file name. If desired, you can mine an intended filename out of the content disposition response header as described in other answers.

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