Js Download File With Authorization Header ^new^ May 2026

Use a Service Worker to intercept the request and append headers dynamically. Summary Checklist

function triggerDownload(blob, filename) { const url = window.URL.createObjectURL(blob); const a = document.createElement('a'); a.style.display = 'none'; a.href = url; a.download = filename; // Forces browser to download instead of opening document.body.appendChild(a); a.click(); // Programmatically click the link // Cleanup window.URL.revokeObjectURL(url); // Release memory document.body.removeChild(a); } Use code with caution. Advanced Options and Libraries Using Axios js download file with authorization header

Use fetch or axios to make an authenticated request. Ensure you set the responseType to blob (for Axios) or call .blob() on the response (for Fetch). javascript Use a Service Worker to intercept the request

async function downloadProtectedFile(url, filename, token) { const response = await fetch(url, { method: 'GET', headers: { 'Authorization': `Bearer ${token}` // Pass your auth token here } }); if (!response.ok) throw new Error('Download failed'); const blob = await response.blob(); // Convert response to a Blob triggerDownload(blob, filename); } Use code with caution. 2. Create a Temporary Object URL Ensure you set the responseType to blob (for Axios) or call

Always call URL.revokeObjectURL() after the download starts to prevent memory leaks.

Ensure your server allows the Authorization header and exposes the Content-Disposition header if you need to read the filename from the server.