Download - File Using Fetch React _verified_

Unlike Axios , which has a built-in onDownloadProgress hook, native Fetch requires manual calculation using a Reader .

The most common way to download a file in React is to fetch the data as a Blob (Binary Large Object), create a temporary URL, and programmatically trigger a download link.

Create a hidden element, set its href to the blob URL, and call .click() . Clean Up: Revoke the object URL to free up memory. Implementation Example javascript download file using fetch react

The standard blob method buffers the entire file into the user's browser memory. For files larger than 100MB, this can crash the tab or cause significant lag.

Whether you're exporting user reports or providing media assets, downloading files is a core requirement for many modern web applications. While a simple tag works for public static files, React developers often need to handle authenticated requests or dynamically generated data. Unlike Axios , which has a built-in onDownloadProgress

const downloadFile = async (url, fileName) => { try { const response = await fetch(url, { method: 'GET', headers: { 'Authorization': `Bearer ${token}`, // If auth is required }, }); if (!response.ok) throw new Error('Download failed'); const blob = await response.blob(); const blobUrl = window.URL.createObjectURL(blob); const link = document.createElement('a'); link.href = blobUrl; link.setAttribute('download', fileName); // Force download document.body.appendChild(link); link.click(); // Clean up link.parentNode.removeChild(link); window.URL.revokeObjectURL(blobUrl); } catch (error) { console.error('Error downloading file:', error); } }; Use code with caution. 2. Handling Large Files with Streams

Request the file with necessary headers (e.g., Auth tokens). Clean Up: Revoke the object URL to free up memory

To handle gigabyte-sized files, use a ReadableStream . This allows you to process data chunk-by-chunk.

Stream large files in React without memory issues - Transloadit