forked from lix-project/lix-website
153 lines
4.7 KiB
Markdown
153 lines
4.7 KiB
Markdown
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# Bytes utility
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[![NPM Version][npm-image]][npm-url]
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[![NPM Downloads][downloads-image]][downloads-url]
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[![Build Status][ci-image]][ci-url]
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[![Test Coverage][coveralls-image]][coveralls-url]
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Utility to parse a string bytes (ex: `1TB`) to bytes (`1099511627776`) and vice-versa.
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## Installation
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This is a [Node.js](https://nodejs.org/en/) module available through the
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[npm registry](https://www.npmjs.com/). Installation is done using the
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[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
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```bash
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$ npm install bytes
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```
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## Usage
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```js
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var bytes = require('bytes');
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```
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#### bytes(number｜string value, [options]): number｜string｜null
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Default export function. Delegates to either `bytes.format` or `bytes.parse` based on the type of `value`.
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**Arguments**
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| Name | Type | Description |
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|---------|----------|--------------------|
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| value | `number`｜`string` | Number value to format or string value to parse |
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| options | `Object` | Conversion options for `format` |
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**Returns**
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| Name | Type | Description |
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|---------|------------------|-------------------------------------------------|
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| results | `string`｜`number`｜`null` | Return null upon error. Numeric value in bytes, or string value otherwise. |
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**Example**
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```js
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bytes(1024);
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// output: '1KB'
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bytes('1KB');
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// output: 1024
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```
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#### bytes.format(number value, [options]): string｜null
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Format the given value in bytes into a string. If the value is negative, it is kept as such. If it is a float, it is
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rounded.
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**Arguments**
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| Name | Type | Description |
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|---------|----------|--------------------|
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| value | `number` | Value in bytes |
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| options | `Object` | Conversion options |
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**Options**
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| Property | Type | Description |
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|-------------------|--------|-----------------------------------------------------------------------------------------|
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| decimalPlaces | `number`｜`null` | Maximum number of decimal places to include in output. Default value to `2`. |
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| fixedDecimals | `boolean`｜`null` | Whether to always display the maximum number of decimal places. Default value to `false` |
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| thousandsSeparator | `string`｜`null` | Example of values: `' '`, `','` and `'.'`... Default value to `''`. |
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| unit | `string`｜`null` | The unit in which the result will be returned (B/KB/MB/GB/TB). Default value to `''` (which means auto detect). |
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| unitSeparator | `string`｜`null` | Separator to use between number and unit. Default value to `''`. |
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**Returns**
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| Name | Type | Description |
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|---------|------------------|-------------------------------------------------|
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| results | `string`｜`null` | Return null upon error. String value otherwise. |
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**Example**
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```js
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bytes.format(1024);
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// output: '1KB'
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bytes.format(1000);
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// output: '1000B'
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bytes.format(1000, {thousandsSeparator: ' '});
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// output: '1 000B'
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bytes.format(1024 * 1.7, {decimalPlaces: 0});
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// output: '2KB'
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bytes.format(1024, {unitSeparator: ' '});
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// output: '1 KB'
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```
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#### bytes.parse(string｜number value): number｜null
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Parse the string value into an integer in bytes. If no unit is given, or `value`
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is a number, it is assumed the value is in bytes.
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Supported units and abbreviations are as follows and are case-insensitive:
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* `b` for bytes
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* `kb` for kilobytes
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* `mb` for megabytes
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* `gb` for gigabytes
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* `tb` for terabytes
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* `pb` for petabytes
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The units are in powers of two, not ten. This means 1kb = 1024b according to this parser.
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**Arguments**
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| Name | Type | Description |
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|---------------|--------|--------------------|
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| value | `string`｜`number` | String to parse, or number in bytes. |
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**Returns**
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| Name | Type | Description |
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|---------|-------------|-------------------------|
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| results | `number`｜`null` | Return null upon error. Value in bytes otherwise. |
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**Example**
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```js
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bytes.parse('1KB');
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// output: 1024
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bytes.parse('1024');
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// output: 1024
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bytes.parse(1024);
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// output: 1024
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```
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## License
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[MIT](LICENSE)
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[ci-image]: https://badgen.net/github/checks/visionmedia/bytes.js/master?label=ci
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[ci-url]: https://github.com/visionmedia/bytes.js/actions?query=workflow%3Aci
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[coveralls-image]: https://badgen.net/coveralls/c/github/visionmedia/bytes.js/master
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[coveralls-url]: https://coveralls.io/r/visionmedia/bytes.js?branch=master
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[downloads-image]: https://badgen.net/npm/dm/bytes
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[downloads-url]: https://npmjs.org/package/bytes
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[npm-image]: https://badgen.net/npm/v/bytes
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[npm-url]: https://npmjs.org/package/bytes
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