pwd-strength

This module takes a password string and validate it according to the specified rules.

Install

npm install --save pwd-strength

Settings

Here is a list of the settings currently available:

Setting	Default	Description
debug	false	Enable debug mode
allErrors	false	Show all errors found as an array instead the first one as string
minUpperChars	1	Minimum uppercase characters required [A-Z].
minLowerChars	1	Minimum lowercase characters required [a-z].
minNumberChars	1	Minimum numbers required [0-9].
minSpecialChars	1	Minimum symbols required (any character not in [a-zA-Z0-9]).
minPasswordLength	8	Minimum password length required.
maxConsecutiveRepeatingChars	2	Maximum consecutive repeating characters allowed.
lang	See below	Object with multi-language strings.
colors	See below	Object with the colors depending on the strength.

Language settings

Here is a list of the language settings currently available:

Language setting	Translation
weak	Weak
average	Average
strong	Strong
secure	Secure
enterPassword	Enter a password
minPasswordChar	At least %s character please
minPasswordChars	At least %s characters please
minLowerChar	At least %s lowercase character please
minLowerChars	At least %s lowercase characters please
minUpperChar	At least %s uppercase character please
minUpperChars	At least %s uppercase characters please
minNumberChar	At least %s number please
minNumberChars	At least %s numbers please
minSpecialChar	At least %s special character please
minSpecialChars	At least %s special characters please
maxConsecutiveRepeatingChars	No more than %s consecutive repeating characters or numbers please

Color settings

Here is a list of the color settings depending on the strength currently available:

Color setting	Default
error	#ee0000
weak	#c43d4b
average	#cc9900
strong	#569f0c
secure	#007000

Testing the library

    const passwordStrength = require('pwd-strength');
    
    let result = passwordStrength('Test');

The function returns an object as follows:

Error response

    {
        "success": false, // any error occurs
        "key": "error", // Indicates error
        "message": "First error message found", // Multilanguage string with the error message
        "color": "#rrggbb" // Hex color depending on the key
    }

Error response with allErrors: true setting

    {
        "success": false, // any error occurs
        "key": "error", // Indicates error
        "message": ["Error message 1", "Error message 2", "Error message 3", ...], // Multilanguage array of strings with the error messages
        "color": "#rrggbb" // Hex color depending on the key
    }

Success response

    {
        "success": true, // no errors
        "key": "weak|average|strong|secure", // Indicates the strength
        "message": "Strength", // Multilanguage string with the strength
        "color": "#rrggbb" // Hex color depending on the key
    }

Error examples

Default settings, the first error checked will be the empty password:

    console.log(passwordStrength(''));
    // {"success":false,"key":"error","message":"Enter a password","color":"#ee0000"}

Default settings, the first error checked will be the password length:

    console.log(passwordStrength('Test'));
    // {"success":false,"key":"error","message":"At least 8 characters please","color":"#ee0000"}

Minimum uppercase characters:

    console.log(passwordStrength('testtest', { minUpperChars: 1 }));
    // {"success":false,"key":"error","message":"At least 1 uppercase character please","color":"#ee0000"}

Minimum lowercase characters:

    console.log(passwordStrength('TESTTEST', { minLowerChars: 1 }));
    // {"success":false,"key":"error","message":"At least 1 lowercase character please","color":"#ee0000"}

Minimum numbers:

    console.log(passwordStrength('TestTest', { minNumberChars: 1 }));
    // {"success":false,"key":"error","message":"At least 1 number please","color":"#ee0000"}

Minimum symbols:

    console.log(passwordStrength('TestTest1', { minSpecialChars: 1 }));
    // {"success":false,"key":"error","message":"At least 1 special character please","color":"#ee0000"}

Maximum consecutive repeating characters allowed:

    console.log(passwordStrength('TestTTTTest1', { maxConsecutiveRepeatingChars: 2 }));
    // {"success":false,"key":"error","message":"No more than 2 consecutive repeating characters or numbers please","color":"#ee0000"}

With allErrors: true setting and the empty password, all possible errors will be shown, only in an error occurs (success: false in the response). This is the only case where the message property will be an array of strings.

    console.log(passwordStrength('', { allErrors: true }));
    // {"success":false,"key":"error","message":["Enter a password","At least 8 characters please","At least 1 lowercase character please","At least 1 uppercase character please","At least 1 number please","At least 1 special character please"],"color":"#ee0000"}

Success examples

Success result, with weak password:

    console.log(passwordStrength('testtest', { minUpperChars: 0, minSpecialChars: 0, minNumberChars: 0 }));
    // {"success":true,"key":"weak","message":"Weak","color":"#c43d4b"}

Success result, with average password:

    console.log(passwordStrength('testest1', { minUpperChars: 0, minSpecialChars: 0 }));
    // {"success":true,"key":"average","message":"Average","color":"#cc9900"}

Success result, with strong password, and default settings:

    console.log(passwordStrength('TestTest1!'));
    // {"success":true,"key":"strong","message":"Strong","color":"#569f0c"}

Success result, with secure password, and default settings:

    console.log(passwordStrength('Test123%$/)=!'));
    // {"success":true,"key":"secure","message":"Secure","color":"#007000"}