React Blob type image download

PNG JPG type images are corrupted after download, but svg type images are working.

here is my code

    const getFileExtension = (filename) => {
        return (/[.]/.exec(filename)) ? /[^.]+$/.exec(filename) : undefined;
    };

    const downloadCertificate = (imageName) => {
        _getCertificate(imageName, (status, data) => {
            if (status === "success") {
                console.log(data);
                const blob = new Blob([data]);
                const link = document.createElement('a');
                link.href = window.URL.createObjectURL(blob);
                link.download = `certificate-${+new Date()}.${getFileExtension(imageName)}`;
                link.click();
            }
        })
    }
    ```