randomatic

Generate randomized strings of a specified length, fast. Only the length is necessary, but you can optionally generate patterns using any combination of numeric, alpha-numeric, alphabetical, special or custom characters.

Install

Install with npm

$ npm i randomatic --save

Install with bower

$ bower install randomatic --save

Usage

var randomize = require('randomatic');

API

randomize(pattern, length, options);

pattern {String}: The pattern to use for randomizing
length {Object}: The length of the string to generate

pattern

The pattern to use for randomizing

Patterns can contain any combination of the below characters, specified in any order.

Example:

To generate a 10-character randomized string using all available characters:

randomize('*', 10);
//=>

randomize('Aa0!', 10);
//=>

a: Lowercase alpha characters (abcdefghijklmnopqrstuvwxyz')
A: Uppercase alpha characters (ABCDEFGHIJKLMNOPQRSTUVWXYZ')
0: Numeric characters (0123456789')
!: Special characters (~!@#$%^&()_+-={}[];\',.)
*: All characters (all of the above combined)
?: Custom characters (pass a string of custom characters to the options)

length

the length of the string to generate

Examples:

randomize('A', 5) will generate a 5-character, uppercase, alphabetical, randomized string, e.g. KDJWJ.
randomize('0', 2) will generate a 2-digit random number
randomize('0', 3) will generate a 3-digit random number
randomize('0', 12) will generate a 12-digit random number
randomize('A0', 16) will generate a 16-character, alpha-numeric randomized string

If length is left undefined, the length of the pattern in the first parameter will be used. For example:

randomize('00') will generate a 2-digit random number
randomize('000') will generate a 3-digit random number
randomize('0000') will generate a 4-digit random number…
randomize('AAAAA') will generate a 5-character, uppercase alphabetical random string…

These are just examples, see the tests for more use cases and examples.

options

chars

Type: String

Default: undefined

Define a custom string to be randomized.

Example:

randomize('?', 20, {chars: 'jonschlinkert'}) will generate a 20-character randomized string from the letters contained in jonschlinkert.
randomize('?', {chars: 'jonschlinkert'}) will generate a 13-character randomized string from the letters contained in jonschlinkert.

Usage Examples

randomize('A', 4) (whitespace insenstive) would result in randomized 4-digit uppercase letters, like, ZAKH, UJSL… etc.
randomize('AAAA') is equivelant to randomize('A', 4)
randomize('AAA0') and randomize('AA00') and randomize('A0A0') are equivelant to randomize('A0', 4)
randomize('aa'): results in double-digit, randomized, lower-case letters (abcdefghijklmnopqrstuvwxyz)
randomize('AAA'): results in triple-digit, randomized, upper-case letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ)
randomize('0', 6): results in six-digit, randomized nubmers (0123456789)
randomize('!', 5): results in single-digit randomized, valid non-letter characters (~!@#$%^&()_+-={}[];\',.)
randomize('A!a0', 9): results in nine-digit, randomized characters (any of the above)

The order in which the characters are defined is insignificant.

pad-left: Left pad a string with zeros or a specified string. Fastest implementation. homepage
pad-right: Right pad a string with zeros or a specified string. Fastest implementation. homepage
repeat-string: Repeat the given string n times. Fastest implementation for repeating a string. homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Author

Jon Schlinkert

License

This file was generated by verb on December 10, 2015.