If you have a raw byte array (e.g., from a WebSocket or an API response), use the following code: javascript
Handling binary data in the browser is a common task when working with export features or legacy APIs that return raw file streams. To download an Excel file from a byte array in JavaScript, the process involves converting that raw data into a and then creating a temporary Object URL to trigger a browser-level download . Core Workflow The general process follows these steps: javascript download excel file from byte array
function downloadExcelFromBase64(base64String, fileName) // Decode base64 to binary string const binaryString = window.atob(base64String); const len = binaryString.length; const bytes = new Uint8Array(len); for (let i = 0; i < len; i++) bytes[i] = binaryString.charCodeAt(i); downloadExcelFromBytes(bytes.buffer, fileName); Use code with caution. Important Technical Details How to save .xlsx data to file as a blob - Stack Overflow If you have a raw byte array (e