filesize.js is a nano(350 b) library to make file size bytes human-readable. e.g. 20.4 Kb.

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npm install filesize.js

The unique API is: fileSize(bytes[, fixed=1, spec='jedec']);.

• bytes: Number of file size bytes.
• fixed: Number of decimal, default is 1.
• spec: String of file size spec, default is jedec.

// bytes.
filesize(123456); 				// '120.6 Kb'
// fixed, `1` is default.
filesize(123456, 0); 			// '121 Kb'
filesize(123456, 4); 			// '1120.5625 Kb'
// specs, `jedec` / `iec / si`.
// `jedec` is default.
filesize(123456, 2, 'iec'); 	// '120.56 Kib'
filesize(123456, 0, 'si'); 		// '123 kb'

npm install

npm test

• jedec: Unit is ['b', 'Kb', 'Mb', 'Gb', 'Tb', 'Pb', 'Eb', 'Zb', 'Yb'], and the power is 1024.
• iec: Unit is ['b', 'Kib', 'Mib', 'Gib', 'Tib', 'Pib', 'Eib', 'Zib', 'Yib'], and the power is 1024.
• si: Unit is ['b', 'kb', 'Mb', 'Gb', 'Tb', 'Pb', 'Eb', 'Zb', 'Yb'], and the power is 1000.

More specs waiting for your issues / pull requests.

MIT@hustcc.