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crypto-random-string

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crypto-random-string

Generate a cryptographically strong random string

    5.0.0latest
    Github

Version published
Maintainers
1
Weekly downloads
14,659,466
increased by8.24%

Weekly downloads

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crypto-random-string

Generate a cryptographically strong random string

Can be useful for creating an identifier, slug, salt, PIN code, fixture, etc.

Works in Node.js and browsers.

Install

npm install crypto-random-string

Usage

import cryptoRandomString from 'crypto-random-string'; cryptoRandomString({length: 10}); //=> '2cf05d94db' cryptoRandomString({length: 10, type: 'base64'}); //=> 'YMiMbaQl6I' cryptoRandomString({length: 10, type: 'url-safe'}); //=> 'YN-tqc8pOw' cryptoRandomString({length: 10, type: 'numeric'}); //=> '8314659141' cryptoRandomString({length: 6, type: 'distinguishable'}); //=> 'CDEHKM' cryptoRandomString({length: 10, type: 'ascii-printable'}); //=> '`#Rt8$IK>B' cryptoRandomString({length: 10, type: 'alphanumeric'}); //=> 'DMuKL8YtE7' cryptoRandomString({length: 10, characters: 'abc'}); //=> 'abaaccabac'

API

cryptoRandomString(options)

Returns a randomized string. Hex by default.

cryptoRandomStringAsync(options)

Returns a promise which resolves to a randomized string. Hex by default.

For most use-cases, there's really no good reason to use this async version. From the Node.js docs:

The crypto.randomBytes() method will not complete until there is sufficient entropy available. This should normally never take longer than a few milliseconds. The only time when generating the random bytes may conceivably block for a longer period of time is right after boot, when the whole system is still low on entropy.

In general, anything async comes with some overhead on it's own.

import {cryptoRandomStringAsync} from 'crypto-random-string'; await cryptoRandomStringAsync({length: 10}); //=> '2cf05d94db'
options

Type: object

length

Required
Type: number

Length of the returned string.

type

Type: string
Default: 'hex'
Values: 'hex' | 'base64' | 'url-safe' | 'numeric' | 'distinguishable' | 'ascii-printable' | 'alphanumeric'

Use only characters from a predefined set of allowed characters.

Cannot be set at the same time as the characters option.

The distinguishable set contains only uppercase characters that are not easily confused: CDEHKMPRTUWXY012458. It can be useful if you need to print out a short string that you'd like users to read and type back in with minimal errors. For example, reading a code off of a screen that needs to be typed into a phone to connect two devices.

The ascii-printable set contains all printable ASCII characters: !"#$%&\'()*+,-./0123456789:;<=>[email protected][\\]^_`abcdefghijklmnopqrstuvwxyz{|}~ Useful for generating passwords where all possible ASCII characters should be used.

The alphanumeric set contains uppercase letters, lowercase letters, and digits: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789. Useful for generating nonce values.

characters

Type: string
Minimum length: 1
Maximum length: 65536

Use only characters from a custom set of allowed characters.

Cannot be set at the same time as the type option.


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Keywords

FAQs

What is crypto-random-string?

Generate a cryptographically strong random string

Is crypto-random-string popular?

The npm package crypto-random-string receives a total of 13,967,263 weekly downloads. As such, crypto-random-string popularity was classified as popular.

Is crypto-random-string well maintained?

We found that crypto-random-string demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago.It has 1 open source maintainer collaborating on the project.

Last updated on 10 May 2022

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