check-password-strength

Overview

A simple way to check that password strength of a certain passphrase. A password strength checker based from Javascript RegEx.

DEMO here

Installation

npm i check-password-strength --save

Setup & Basic Usage

const passwordStrength = require('check-password-strength')

console.log(passwordStrength('asdfasdf').value)
// Weak (It will return weak if the value doesn't match the RegEx conditions)

console.log(passwordStrength('Asdfasdf2020').value)
// Medium

console.log(passwordStrength('A@2asdF2020!!*').value)
// Strong

Additional Info

Object

Property	Desc.
id	0 = Weak, 1 = Medium & 2 = Strong
value	Weak, Medium & Strong
contains	lowercase, uppercase, symbol and/or number
length	length of the password

console.log(passwordStrength('@Sdfasd2020!@#$'))
// output 
{ 
    "id": 1, 
    "value": "Strong",
    "contains": [{'message': 'lowercase'},{'message': 'uppercase'},{'message': 'symbol'},{'message': 'number'}],
    "length": 15
}

RegEx

Strong Password RegEx used:

^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#\$%\^&\*])(?=.{8,})

Medium Password RegEx used:

^(((?=.*[a-z])(?=.*[A-Z]))|((?=.*[a-z])(?=.*[0-9]))|((?=.*[A-Z])(?=.*[0-9])))(?=.{6,})"

RegEx	Desc.
^	The password string will start this way
(?=.*[a-z])	The string must contain at least 1 lowercase alphabetical character
(?=.*[A-Z])	The string must contain at least 1 uppercase alphabetical character
(?=.*[0-9])	The string must contain at least 1 numeric character
(?=.[!@#$%^&])	The string must contain at least one special character, but we are escaping reserved RegEx characters to avoid conflict
(?=.{8,})	The string must be eight characters or longer

Credits to Nic Raboy for his awesome blog!

Contribute

Feel free to clone or fork this project: https://github.com/deanilvincent/check-password-strength.git

Contributions & pull requests are welcome!

I'll be glad if you give this project a ★ on Github :)

License

This project is licensed under the MIT License - see the LICENSE.md file for details.