password-chacker-xqwe/validators/characterValidator.js

A simple password strength checker with basic and advanced validation

export default function characterValidator(password){
    let score = 4;
    const message = [
        "Add at least one lowercase letters", 
        "Add at least one uppercase letters",
        "Add at least one numbers ",
        "Add at least one specials characters"
    ];
    const validate_ch = [false, false, false, false];
    const lowercase = (password.match(/[a-z]/g) || []).length;
    const uppercase = (password.match(/[A-Z]/g) || []).length;
    const numbers = (password.match(/[0-9]/g) || []).length;
    const specials = (password.match(/[^a-zA-Z0-9]/g) || []).length;
    
    if(lowercase <= 0 ) {
        score -= 1;
    } else{
        validate_ch[0] = true;
        message[0] = "At least one lowercase letter found"
    }

    if( uppercase <= 0 ){
        score -= 1;
    } else{
        validate_ch[1] = true;
        message[1] = "At least one lowercase letter found"
    }

    if( numbers <= 0 ){
        score -= 1;
    } else{
        validate_ch[2] = true;
        message[2] = "At least one lowercase letter found"
    }

    if( specials <= 0 ){
        score -= 1;
    }  else{
        validate_ch[3] = true;
        message[3] = "At least one lowercase letter found"
    }


    return { 
        "score":score,
        "is_valid": validate_ch.every(Boolean),
        "uppercase": {
            "present": validate_ch[0],
            "message": message[0],
            "count": uppercase.length
        },
        "lowercase": {
            "present": validate_ch[1],
            "message": message[1],
            "count": lowercase.length
        },
        "digits": {
            "present": validate_ch[2],
            "message": message[2],
            "count": numbers.length
        },
        "special_characters": {
            "present": validate_ch[3],
            "message": message[3],
            "count": specials.length
        }
    };
}

export function whitespace(password){
    const ws = /\s/.test(password);

    return {
        "is_valid": !ws,
        "message": ws ? "whitespace is not allowed" : "No whitespace detected"
    }
}

export function repeatingCharacters(password){
    const repeatedPatten = password.match(/(.)\1{3,}/g);

    return {
        "is_valid": repeatedPatten == "",
        "score": -1,
        "max_repeats_allowed": 3,
        "repeated_characters_str": repeatedPatten,
        "message": repeatedPatten == "" ? "No excessive repeating characters detected" : `repeating characters detected i.e ${repeatedPatten}`
    }
}