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https://github.com/jonschlinkert/randomatic

Easily generate random strings like passwords, with simple options for specifying a length and for using patterns of numeric, alpha-numeric, alphabetical, special or custom characters. (the original "generate-password")
https://github.com/jonschlinkert/randomatic

characters digit generate-password javascript nodejs password random random-characters randomize repeat

Last synced: 13 days ago
JSON representation

Host: GitHub
URL: https://github.com/jonschlinkert/randomatic
Owner: jonschlinkert
License: mit
Created: 2014-01-04T11:19:48.000Z (almost 11 years ago)
Default Branch: master
Last Pushed: 2023-07-28T08:13:47.000Z (over 1 year ago)
Last Synced: 2024-05-01T22:16:44.373Z (6 months ago)
Topics: characters, digit, generate-password, javascript, nodejs, password, random, random-characters, randomize, repeat
Language: JavaScript
Homepage: https://github.com/jonschlinkert
Size: 95.7 KB
Stars: 183
Watchers: 8
Forks: 26
Open Issues: 7
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

awesome-nodejs - randomatic - Easily generate random strings like passwords, with simple options for specifying a length and for using patterns of numeric, alpha-numeric, alphabetical, special or custom characters. (the original "generate-password") ![](https://img.shields.io/github/stars/jonschlinkert/randomatic.svg?style=social&label=Star) (Repository / Text/String)

README

        # 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)

> 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.

## Install

Install with [npm](https://www.npmjs.com/):

```sh

$ npm install --save randomatic

```

## Usage

```js

var randomize = require('randomatic');

```

## API

```js

randomize(pattern, length, options);

randomize.isCrypto;

```

* `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`.

### 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);

//=> 'x2_^-5_T[$'

randomize('Aa0!', 10);

//=> 'LV3u~BSGhw'

```

* `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](./test.js) for more use cases and examples.

## options

> These are options that can be passed as the third argument.

#### 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`.

#### 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`.

## Usage Examples

* `randomize('A', 4)` (_whitespace insensitive_) would result in randomized 4-digit uppercase letters, like, `ZAKH`, `UJSL`... etc.

* `randomize('AAAA')` is equivalent to `randomize('A', 4)`

* `randomize('AAA0')` and `randomize('AA00')` and `randomize('A0A0')` are equivalent 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 numbers (`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._

## About

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).

Running Tests

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:

```sh

$ npm install && npm test

```

Building docs

_(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.)_

To generate the readme, run the following command:

```sh

$ npm install -g verbose/verb#dev verb-generate-readme && verb

```

### Related projects

You might also be interested in these 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.")

### Contributors

| **Commits** | **Contributor** |  

| --- | --- |  

| 56 | [jonschlinkert](https://github.com/jonschlinkert) |  

| 6  | [doowb](https://github.com/doowb) |  

| 4  | [kivlor](https://github.com/kivlor) |  

| 2  | [realityking](https://github.com/realityking) |  

| 2  | [ywpark1](https://github.com/ywpark1) |  

| 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) |  

### Author

**Jon Schlinkert**

* [GitHub Profile](https://github.com/jonschlinkert)

* [Twitter Profile](https://twitter.com/jonschlinkert)

* [LinkedIn Profile](https://linkedin.com/in/jonschlinkert)

### License

Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert).

Released under the [MIT License](LICENSE).

***

_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.8.0, on October 23, 2018._