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# pretty-bytes
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> Convert bytes to a human readable string: `1337` → `1.34 kB`
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Useful for displaying file sizes for humans.
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*Note that it uses base-10 (e.g. kilobyte).
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[Read about the difference between kilobyte and kibibyte.](https://web.archive.org/web/20150324153922/https://pacoup.com/2009/05/26/kb-kb-kib-whats-up-with-that/)*
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## Install
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```sh
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npm install pretty-bytes
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```
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## Usage
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```js
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import prettyBytes from 'pretty-bytes';
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prettyBytes(1337);
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//=> '1.34 kB'
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prettyBytes(100);
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//=> '100 B'
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// Display with units of bits
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prettyBytes(1337, {bits: true});
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//=> '1.34 kbit'
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// Display file size differences
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prettyBytes(42, {signed: true});
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//=> '+42 B'
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// Localized output using German locale
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prettyBytes(1337, {locale: 'de'});
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//=> '1,34 kB'
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```
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## API
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### prettyBytes(number, options?)
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#### number
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Type: `number`
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The number to format.
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#### options
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Type: `object`
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##### signed
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Type: `boolean`\
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Default: `false`
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Include plus sign for positive numbers. If the difference is exactly zero a space character will be prepended instead for better alignment.
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##### bits
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Type: `boolean`\
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Default: `false`
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Format the number as [bits](https://en.wikipedia.org/wiki/Bit) instead of [bytes](https://en.wikipedia.org/wiki/Byte). This can be useful when, for example, referring to [bit rate](https://en.wikipedia.org/wiki/Bit_rate).
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##### binary
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Type: `boolean`\
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Default: `false`
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Format the number using the [Binary Prefix](https://en.wikipedia.org/wiki/Binary_prefix) instead of the [SI Prefix](https://en.wikipedia.org/wiki/SI_prefix). This can be useful for presenting memory amounts. However, this should not be used for presenting file sizes.
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##### locale
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Type: `boolean | string`\
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Default: `false` *(No localization)*
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**Important:** Only the number and decimal separator are localized. The unit title is not and will not be localized.
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- If `true`: Localize the output using the system/browser locale.
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- If `string`: Expects a [BCP 47 language tag](https://en.wikipedia.org/wiki/IETF_language_tag) (For example: `en`, `de`, …)
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- If `string[]`: Expects a list of [BCP 47 language tags](https://en.wikipedia.org/wiki/IETF_language_tag) (For example: `en`, `de`, …)
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##### minimumFractionDigits
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Type: `number`\
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Default: `undefined`
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The minimum number of fraction digits to display.
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If neither `minimumFractionDigits` or `maximumFractionDigits` are set, the default behavior is to round to 3 significant digits.
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```js
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import prettyBytes from 'pretty-bytes';
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// Show the number with at least 3 fractional digits
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prettyBytes(1900, {minimumFractionDigits: 3});
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//=> '1.900 kB'
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prettyBytes(1900);
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//=> '1.9 kB'
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```
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##### maximumFractionDigits
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Type: `number`\
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Default: `undefined`
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The maximum number of fraction digits to display.
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If neither `minimumFractionDigits` or `maximumFractionDigits` are set, the default behavior is to round to 3 significant digits.
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```js
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import prettyBytes from 'pretty-bytes';
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// Show the number with at most 1 fractional digit
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prettyBytes(1920, {maximumFractionDigits: 1});
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//=> '1.9 kB'
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prettyBytes(1920);
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//=> '1.92 kB'
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```
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##### space
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Type: `boolean`\
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Default: `true`
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Put a space between the number and unit.
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```js
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import prettyBytes from 'pretty-bytes';
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prettyBytes(1920, {space: false});
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//=> '1.9kB'
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prettyBytes(1920);
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//=> '1.92 kB'
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```
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## Related
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- [pretty-bytes-cli](https://github.com/sindresorhus/pretty-bytes-cli) - CLI for this module
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- [pretty-ms](https://github.com/sindresorhus/pretty-ms) - Convert milliseconds to a human readable string
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