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README.hbs
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[](https://www.npmjs.org/package/byte-size)
[](https://www.npmjs.org/package/byte-size)
[](https://github.com/75lb/byte-size/network/dependents?dependent_type=REPOSITORY)
[](https://github.com/75lb/byte-size/network/dependents?dependent_type=PACKAGE)
[](https://github.com/75lb/byte-size/actions/workflows/node.js.yml)
[](https://github.com/feross/standard)
***Upgraders, please check the [release notes](https://github.com/75lb/byte-size/releases).***
# byte-size
An isomorphic, load-anywhere function to convert a bytes value (e.g. `3456`) to a human-readable string (`'3.5 kB'`). Choose between [metric or IEC units](https://en.wikipedia.org/wiki/Gigabyte) (summarised below) or specify your own custom units.
Value | Metric | Metric (octet) |
----- | ------------- | -------------- |
1000 | kB kilobyte | ko kilooctet |
1000^2 | MB megabyte | Mo megaoctet |
1000^3 | GB gigabyte | Go gigaoctet |
1000^4 | TB terabyte | To teraoctet |
1000^5 | PB petabyte | Po petaoctet |
1000^6 | EB exabyte | Eo exaoctet |
1000^7 | ZB zettabyte | Zo zettaoctet |
1000^8 | YB yottabyte | Yo yottaoctet |
Value | IEC | IEC (octet) |
------ | ------------ | ------------- |
1024 | KiB kibibyte | Kio kibioctet |
1024^2 | MiB mebibyte | Mio mebioctet |
1024^3 | GiB gibibyte | Gio gibioctet |
1024^4 | TiB tebibyte | Tio tebioctet |
1024^5 | PiB pebibyte | Pio pebioctet |
1024^6 | EiB exbibyte | Eio exbioctet |
1024^7 | ZiB zebibyte | Zio zebioctet |
1024^8 | YiB yobibyte | Yio yobioctet |
## Synopsis
By default, `byteSize` converts the input number to a human readable string with metric units and a precision of 1.
```js
> const byteSize = require('byte-size')
> byteSize(1580)
{ value: '1.6', unit: 'kB', long: 'kilobytes' }
```
The object returned by `byteSize` defines a `toString` method therefore can be used directly in string context.
```js
> `Filesize: ${byteSize(12400)}`
'Filesize: 12.4 kB'
```
Override the default `toString` behaviour by setting [`options.toStringFn`](#bytesizebytes-options--object-).
```js
> function toStringFn () {
return `**${this.value}${this.unit}**`
}
> `Filesize: ${byteSize(12400, { toStringFn })}`
'Filesize: **12.4kB**'
```
Beside the default of `metric`, there are three other built-in units available: `metric_octet`, `iec` and `iec_octet`.
```js
> byteSize(1580, { units: 'iec' })
{ value: '1.5', unit: 'KiB', long: 'kibibytes' }
> byteSize(1580, { units: 'iec_octet' })
{ value: '1.5', unit: 'Kio', long: 'kibioctets' }
> byteSize(1580, { units: 'metric_octet' })
{ value: '1.6', unit: 'ko', long: 'kilooctets' }
```
You can adjust the `precision`.
```js
> byteSize(1580, { units: 'iec', precision: 3 })
{ value: '1.543', unit: 'KiB', long: 'kibibytes' }
> byteSize(1580, { units: 'iec', precision: 0 })
{ value: '2', unit: 'KiB', long: 'kibibytes' }
```
Define custom units by passing an object containing one or more additional conversion tables to `options.customUnits`. In `options.units`, specify the name of a property from the `customUnits` object.
```js
> const customUnits = {
simple: [
{ from: 0 , to: 1e3 , unit: '' },
{ from: 1e3 , to: 1e6 , unit: 'K', long: 'thousand' },
{ from: 1e6 , to: 1e9 , unit: 'Mn', long: 'million' },
{ from: 1e9 , to: 1e12, unit: 'Bn', long: 'billion' }
]
}
> const { value, unit } = byteSize(10000, { customUnits, units: 'simple' })
> `${value}${unit}`
'10.0K'
```
Override the built-in defaults for the duration of the process by passing an options object to `byteSize.defaultOptions()`. This results in cleaner code in cases where `byteSize` is used often with the same options.
```js
> byteSize.defaultOptions({
units: 'simple',
precision: 2,
customUnits: {
simple: [
{ from: 0, to: 1e3, unit: '' },
{ from: 1e3, to: 1e6, unit: 'k' },
{ from: 1e6, to: 1e9, unit: 'm' },
{ from: 1e9, to: 1e12, unit: 'bn' },
]
},
toStringFn: function () {
return this.value + this.unit
}
})
> [2400, 16400, 3991200].map(byteSize).join(', ')
'2.40k, 16.40k, 3.99m'
```
{{>main}}
## Load anywhere
This library is compatible with Node.js, the Web and any style of module loader. It can be loaded anywhere, natively without transpilation.
Node.js (CommonJS):
```js
const byteSize = require('byte-size')
```
Node.js (ECMAScript Module):
```js
import byteSize from 'byte-size'
```
Within a modern browser ECMAScript Module:
```js
import byteSize from './node_modules/byte-size/index.js'
```
Browser global (adds `window.byteSize`):
```html
<script src="./node_modules/byte-size/dist/index.js"></script>
```
* * *
© 2014-25 [Lloyd Brookes](https://github.com/75lb) \<[email protected]\>.
Tested by [test-runner](https://github.com/test-runner-js/test-runner). Documented by [jsdoc-to-markdown](https://github.com/jsdoc2md/jsdoc-to-markdown).