: Create a hidden anchor tag with the download attribute and click it. javascript
In Node.js, the term "download" often refers to saving raw binary Buffer data received from an API or a stream to the local disk. How to Write a Buffer as File in Node.js - Nesin.io download buffer javascript
The process of downloading a "buffer" in JavaScript depends entirely on your environment. In the browser, you typically convert an ArrayBuffer or Blob into a downloadable file via a temporary link. In Node.js, "downloading" usually means saving a Buffer object directly to the local file system. 1. Download Buffer in the Browser (Client-Side) : Create a hidden anchor tag with the
To download binary data as a file on the client side, you must wrap the data in a Blob (Binary Large Object), generate a temporary URL for it, and trigger a programmatic click on an anchor ( ) element. Step-by-Step Implementation: In the browser, you typically convert an ArrayBuffer
: Encapsulate your ArrayBuffer or typed array (like Uint8Array ) into a Blob , specifying the correct MIME type.
: Use the URL.createObjectURL() API to create a memory-resident URL that points to the blob.
/** * Triggers a browser download for a given buffer * @param Uint8Array buffer - The binary data * @param string filename - The name of the saved file * @param string mimeType - e.g., 'application/pdf', 'image/png' */ function downloadBuffer(buffer, filename, mimeType) // 1. Create a Blob from the buffer const blob = new Blob([buffer], type: mimeType ); // 2. Generate a temporary URL for the Blob const url = window.URL.createObjectURL(blob); // 3. Create a hidden element const link = document.createElement('a'); link.href = url; link.download = filename; // 4. Append, click, and clean up document.body.appendChild(link); link.click(); // Best practice: remove element and revoke URL to free memory document.body.removeChild(link); window.URL.revokeObjectURL(url); Use code with caution. 2. Download Buffer in Node.js (Server-Side)