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Readme.md

Bytes utility

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Utility to parse a string bytes (ex: 1TB) to bytes (1099511627776) and vice-versa.

Installation

This is a Node.js module available through the npm registry. Installation is done using the npm install command:

$ npm install bytes

Usage

var bytes = require('bytes');

bytes.format(number value, [options]): string|null

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 rounded.

Arguments

Name Type Description
value number Value in bytes
options Object Conversion options

Options

Property Type Description
decimalPlaces number|null Maximum number of decimal places to include in output. Default value to 2.
fixedDecimals boolean|null Whether to always display the maximum number of decimal places. Default value to false
thousandsSeparator string|null Example of values: ' ', ',' and .… Default value to ''.
unit string|null The unit in which the result will be returned (B/KB/MB/GB/TB). Default value to '' (which means auto detect).
unitSeparator string|null Separator to use between number and unit. Default value to ''.

Returns

Name Type Description
results string|null Return null upon error. String value otherwise.

Example

bytes(1024);
// output: '1KB'

bytes(1000);
// output: '1000B'

bytes(1000, {thousandsSeparator: ' '});
// output: '1 000B'

bytes(1024 * 1.7, {decimalPlaces: 0});
// output: '2KB'

bytes(1024, {unitSeparator: ' '});
// output: '1 KB'

bytes.parse(string|number value): number|null

Parse the string value into an integer in bytes. If no unit is given, or value is a number, it is assumed the value is in bytes.

Supported units and abbreviations are as follows and are case-insensitive:

  • b for bytes
  • kb for kilobytes
  • mb for megabytes
  • gb for gigabytes
  • tb for terabytes
  • pb for petabytes

The units are in powers of two, not ten. This means 1kb = 1024b according to this parser.

Arguments

Name Type Description
value string|number String to parse, or number in bytes.

Returns

Name Type Description
results number|null Return null upon error. Value in bytes otherwise.

Example

bytes('1KB');
// output: 1024

bytes('1024');
// output: 1024

bytes(1024);
// output: 1KB

License

MIT