Convert size in bytes to human readable format (JavaScript)

formatBytes.js

function formatBytes(bytes,decimals) {
   if(bytes == 0) return '0 Bytes';
   var k = 1024,
       dm = decimals || 2,
       sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
       i = Math.floor(Math.log(bytes) / Math.log(k));
   return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
}

// Usage:
// formatBytes(bytes,decimals)

formatBytes(1024);       // 1 KB
formatBytes('1024');     // 1 KB
formatBytes(1234);       // 1.21 KB
formatBytes(1234, 3);    // 1.205 KB

WOW NICE!!!!

Clever

Thank you for sharing!

Absolutely cool snippet

Thank you! Helped a lot.

Awesome snippet. Thanks!

This helped a lot! Thank you

Nice concept. I've forked it to support IEC units as well

Very nice, gonna use myself. Thanks, I did make some minor changes though.

export function formatBytes(bytes, dm = 2) {
  if (bytes == 0) return '0 Bytes';
  var k = 1024,
    sizes = [`${bytes <= 1 ? "Byte" : "Bytes"}`, 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
    i = Math.floor(Math.log(bytes) / Math.log(k));
  return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
}```

Awesome!

Perfect! Exactly what I was looking for. 👍

Great work, and thanks!

thank you 🙏
this is my typescript version with minor changes

function formatBytes(bytes: number, decimals = 2): string {
  if (bytes === 0) return "0 Bytes";
  const k = 1024;
  const dm = decimals || 2;
  const sizes = ["Bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
  const i = Math.floor(Math.log(bytes) / Math.log(k));
  return `${Number.parseFloat((bytes / k ** i).toFixed(dm))} ${sizes[i]}`;
}