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# randomatic [![NPM version](https://img.shields.io/npm/v/randomatic.svg?style=flat)](https://www.npmjs.com/package/randomatic) [![NPM monthly downloads](https://img.shields.io/npm/dm/randomatic.svg?style=flat)](https://npmjs.org/package/randomatic) [![NPM total downloads](https://img.shields.io/npm/dt/randomatic.svg?style=flat)](https://npmjs.org/package/randomatic) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/randomatic.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/randomatic)
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> Generate randomized strings of a specified length using simple character sequences. The original generate-password.
Please consider following this project's author, [Jon Schlinkert ](https://github.com/jonschlinkert ), and consider starring the project to show your :heart: and support.
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## Install
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Install with [npm ](https://www.npmjs.com/ ):
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```sh
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$ npm install --save randomatic
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```
## Usage
```js
var randomize = require('randomatic');
```
## API
```js
randomize(pattern, length, options);
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randomize.isCrypto;
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```
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* `pattern` ** {String}**: (required) The pattern to use for randomizing
* `length` ** {Number}**: (optional) The length of the string to generate
* `options` ** {Object}**: (optional) See available [options ](#options )
* `randomize.isCrypto` will be `true` when a cryptographically secure function is being used to generate random numbers. The value will be `false` when the function in use is `Math.random` .
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### 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:
```js
randomize('*', 10);
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//=> 'x2_^-5_T[$'
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randomize('Aa0!', 10);
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//=> 'LV3u~BSGhw'
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```
* `a` : Lowercase alpha characters (`abcdefghijklmnopqrstuvwxyz'`)
* `A` : Uppercase alpha characters (`ABCDEFGHIJKLMNOPQRSTUVWXYZ'`)
* `0` : Numeric characters (`0123456789'`)
* `!` : Special characters (`~!@#$%^&()_+-={}[]; \',.`)
* `*` : 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:
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* `randomize('00')` will generate a 2-digit random number
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* `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 ](./test.js ) for more use cases and examples.
#### 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` .
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#### exclude
Type: `String|Array`
Default: `undefined`
Specify a string or array of characters can are excluded from the possible characters used to generate the randomized string.
**Example:**
* `randomize('*', 20, { exclude: '0oOiIlL1' })` will generate a 20-character randomized string using all of possible characters except for `0oOiIlL1` .
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## 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`)
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* `randomize('0', 6)` : results in six-digit, randomized numbers (`0123456789`)
* `randomize('!', 5)` : results in single-digit randomized, _valid_ non-letter characters (`~!@#$%^& ()_+-={}[]
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* `randomize('A!a0', 9)` : results in nine-digit, randomized characters (any of the above)
_The order in which the characters are defined is insignificant._
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## About
### Related projects
* [pad-left ](https://www.npmjs.com/package/pad-left ): Left pad a string with zeros or a specified string. Fastest implementation. | [homepage ](https://github.com/jonschlinkert/pad-left "Left pad a string with zeros or a specified string. Fastest implementation." )
* [pad-right ](https://www.npmjs.com/package/pad-right ): Right pad a string with zeros or a specified string. Fastest implementation. | [homepage ](https://github.com/jonschlinkert/pad-right "Right pad a string with zeros or a specified string. Fastest implementation." )
* [repeat-string ](https://www.npmjs.com/package/repeat-string ): Repeat the given string n times. Fastest implementation for repeating a string. | [homepage ](https://github.com/jonschlinkert/repeat-string "Repeat the given string n times. Fastest implementation for repeating a string." )
### Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue ](../../issues/new ).
### Contributors
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| **Commits** | **Contributor** |
| --- | --- |
| 56 | [jonschlinkert ](https://github.com/jonschlinkert ) |
| 2 | [realityking ](https://github.com/realityking ) |
| 1 | [TrySound ](https://github.com/TrySound ) |
| 1 | [Drag0s ](https://github.com/Drag0s ) |
| 1 | [paulmillr ](https://github.com/paulmillr ) |
| 1 | [sunknudsen ](https://github.com/sunknudsen ) |
| 1 | [faizulhaque-tp ](https://github.com/faizulhaque-tp ) |
| 1 | [michaelrhodes ](https://github.com/michaelrhodes ) |
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### Building docs
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_(This project's readme.md is generated by [verb ](https://github.com/verbose/verb-generate-readme ), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md ](.verb.md ) readme template.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme & & verb
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```
### Running tests
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Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
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```sh
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$ npm install & & npm test
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```
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### Author
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**Jon Schlinkert**
* [github/jonschlinkert ](https://github.com/jonschlinkert )
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* [twitter/jonschlinkert ](https://twitter.com/jonschlinkert )
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### License
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Copyright © 2018, [Jon Schlinkert ](https://github.com/jonschlinkert ).
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Released under the [MIT License ](LICENSE ).
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***
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_This file was generated by [verb-generate-readme ](https://github.com/verbose/verb-generate-readme ), v0.7.0, on August 08, 2018._