neo-bytes

Convert bytes to a human readable string: 1337 → 1.34 kB

Useful for displaying file sizes for humans.

Note that it uses base-10 (e.g. kilobyte). Read about the difference between kilobyte and kibibyte.

This project stands on the shoulders of the great pretty-bytes by Sindre Sorhus. It is a fork of the original project with additional features.

Install

npm install neo-bytes

Usage

import neoBytes from 'neo-bytes';

neoBytes(1337);
//=> '1.34 kB'

neoBytes(100);
//=> '100 B'

// Display with units of bits
neoBytes(1337, {bits: true});
//=> '1.34 kbit'

// Display file size differences
neoBytes(42, {signed: true});
//=> '+42 B'

// Localized output using German locale
neoBytes(1337, {locale: 'de'});
//=> '1,34 kB'

Migrating from pretty-bytes

import prettyBytes from 'pretty-bytes';
//                       vvv
import prettyBytes from 'neo-bytes';

API

neoBytes(number, options?)

number

Type: number

The number to format.

options

Type: object

signed

Type: boolean
Default: false

Include plus sign for positive numbers. If the difference is exactly zero a space character will be prepended instead for better alignment.

bits

Type: boolean
Default: false

Format the number as bits instead of bytes. This can be useful when, for example, referring to bit rate.

binary

Type: boolean
Default: false

Format the number using the Binary Prefix instead of the SI Prefix. This can be useful for presenting memory amounts. However, this should not be used for presenting file sizes.

locale

Type: boolean | string
Default: false (No localization)

Important: Only the number and decimal separator are localized. The unit title is not and will not be localized.

• If true: Localize the output using the system/browser locale.
• If string: Expects a BCP 47 language tag (For example: en, de, …)
• If string[]: Expects a list of BCP 47 language tags (For example: en, de, …)

minimumFractionDigits

Type: number
Default: undefined

The minimum number of fraction digits to display.

If neither minimumFractionDigits or maximumFractionDigits are set, the default behavior is to round to 3 significant digits.

import neoBytes from 'neo-bytes';

// Show the number with at least 3 fractional digits
neoBytes(1900, {minimumFractionDigits: 3});
//=> '1.900 kB'

neoBytes(1900);
//=> '1.9 kB'

maximumFractionDigits

Type: number
Default: undefined

The maximum number of fraction digits to display.

If neither minimumFractionDigits or maximumFractionDigits are set, the default behavior is to round to 3 significant digits.

import neoBytes from 'neo-bytes';

// Show the number with at most 1 fractional digit
neoBytes(1920, {maximumFractionDigits: 1});
//=> '1.9 kB'

neoBytes(1920);
//=> '1.92 kB'

space

Type: boolean
Default: true

Put a space between the number and unit.

import neoBytes from 'neo-bytes';

neoBytes(1920, {space: false});
//=> '1.9kB'

neoBytes(1920);
//=> '1.92 kB'

noi

Type: boolean
Default: false

Remove 'i' from the binary enabled formatted output.

import neoBytes from 'neo-bytes';

neoBytes(1024, {binary: true});
//=> '1 kiB'

neoBytes(1024, {binary: true, noi: true});
//=> '1 kB'

noit

Type: boolean
Default: false

Remove 'it' from the bits enabled formatted output.

import neoBytes from 'neo-bytes';

neoBytes(1337, {bits: true});
//=> '1.34 kbit'

neoBytes(1337, {bits: true, noit: true});
//=> '1.34 kb'

suffix

Type: string
Default: undefined

Suffix to append to the formatted number.

import neoBytes from 'neo-bytes';

neoBytes(1337, {suffix: '/s'});
//=> '1.34 kB/s'

neoBytes(10e8, {bits: true, noit: true, suffix: 'ps'});
//=> '1 Gbps'

neoBytes(10e9, {bits: true, space: false, noit: true, suffix: 'ps'})
//=> '10Gbps'

Related

• pretty-bytes - Original module
• pretty-bytes-cli - CLI for original module
• pretty-ms - Convert milliseconds to a human readable string