filesize

What is filesize?

The filesize npm package is a library designed to provide simple file size conversion and formatting. It allows users to convert raw file size numbers into human-readable strings, with support for multiple units and customization options. This can be particularly useful in applications where file sizes need to be displayed to users in a format that is easy to understand.

What are filesize's main functionalities?

Basic file size formatting

Converts a file size in bytes to a human-readable string using the most appropriate unit. In this example, 1024 bytes are converted to '1 KB'.

"const filesize = require('filesize');
console.log(filesize(1024)); // '1 KB'"

Customizing the output

Allows customization of the output format, including rounding and the spacer between the number and the unit. This example shows no rounding and removes the space between the number and the unit.

"const filesize = require('filesize');
console.log(filesize(1024, {round: 0, spacer: ''})); // '1KB'"

Using different units

Supports using different unit standards, such as the International Electrotechnical Commission (IEC) standard, which uses 'KiB' instead of 'KB' for 1024 bytes.

"const filesize = require('filesize');
console.log(filesize(1024, {standard: 'iec'})); // '1 KiB'"

Other packages similar to filesize

pretty-bytes

Similar to filesize, pretty-bytes converts byte values into a human-readable format. It focuses on simplicity and does not offer as many customization options as filesize, making it a good choice for straightforward use cases.

bytes

The bytes package also provides functionality for formatting byte sizes into human-readable strings. It offers a balance between simplicity and customization, with options to specify the number of decimal places and the units to use.

README

filesize.js

filesize.js provides a simple way to get a human-readable file size string from a number (float or integer) or string.

import {filesize} from "filesize";
filesize(265318, {standard: "jedec"}); // "259.1 KB"

Testing

filesize has 100% code coverage with its tests.

--------------|---------|----------|---------|---------|-----------------------
File          | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
--------------|---------|----------|---------|---------|-----------------------
All files     |     100 |    95.52 |     100 |     100 |                      
 filesize.cjs |     100 |    95.52 |     100 |     100 | 77-78,173,196,199,210
--------------|---------|----------|---------|---------|-----------------------

Optional settings

filesize() accepts an optional descriptor Object as a second argument, so you can customize the output.

base

(number) Number base, default is 10

bits

(boolean) Enables bit sizes, default is false

exponent

(number) Specifies the symbol via exponent, e.g. 2 is MB for base 2, default is -1

fullform

(boolean) Enables full form of unit of measure, default is false

fullforms

(array) Array of full form overrides, default is []

locale (overrides 'separator')

(string || boolean) BCP 47 language tag to specify a locale, or true to use default locale, default is ""

localeOptions (overrides 'separator', requires string for 'locale' option)

(object) Dictionary of options defined by ECMA-402 (Number.prototype.toLocaleString). Requires locale option to be explicitly passed as a string, otherwise is ignored.

output

(string) Output of function (array, exponent, object, or string), default is string

pad

(boolean) Decimal place end padding, default is false

precision

(number) Sets precision of numerical output, default is 0

round

(number) Decimal place, default is 2

roundingMethod

(string) Rounding method, can be round, floor, or ceil, default is round

separator

(string) Decimal separator character, default is an empty string.

spacer

(string) Character between the result and symbol, default is " "

standard

(string) Standard unit of measure, can be iec, jedec, or si. Default is si (base 10). The si option is an alias of jedec, such that it is not valid for other configuration options.

symbols

(object) Dictionary of IEC/JEDEC symbols to replace for localization, defaults to english if no match is found; SI is handled automatically with JEDEC values.

Examples

filesize(500);                        // "500 B"
filesize(500, {bits: true});          // "4 kbit"
filesize(265318, {base: 2});          // "259.1 KiB"
filesize(265318);                     // "265.32 kB"
filesize(265318, {round: 0});         // "265 kB"
filesize(265318, {output: "array"});  // [265.32, "kB"]
filesize(265318, {output: "object"}); // {value: 265.32, symbol: "kB", exponent: 1, unit: "kB"}
filesize(1, {symbols: {B: "Б"}});     // "1 Б"
filesize(1024);                       // "1.02 kB"
filesize(1024, {exponent: 0});        // "1024 B"
filesize(1024, {output: "exponent"}); // 1
filesize(265318, {standard: "jedec"});  // "259.1 KB"
filesize(265318, {base: 2, fullform: true}); // "259.1 kibibytes"
filesize(12, {fullform: true, fullforms: ["байтов"]});  // "12 байтов"
filesize(265318, {separator: ","});   // "265,32 kB"
filesize(265318, {locale: "de"});   // "265,32 kB"

Partial Application

partial() takes the second parameter of filesize() and returns a new function with the configuration applied upon execution. This can be used to reduce Object creation if you call filesize() without caching the descriptor in lexical scope.

import {partial} from "filesize";
const size = partial({standard: "jedec"});

size(265318); // "259.1 KB"

License

Copyright (c) 2024 Jason Mulligan Licensed under the BSD-3 license.

Changelog

10.1.5

3 September 2024

• Fixing implementation of 'pad' such that 'separator' is not required for it to be applied, fixes #184 #184
• Generated CHANGELOG.md 0248be0