Check Password Strength In JavaScript

Welcome to Code With Random blog. In this blog, we learn how we create a  password strength checker. We use HTML, CSS, and JavaScript for this password strength checker. I hope you enjoy our blog so let’s start with a basic HTML structure for the password strength checker.

Using CSS we present Check Password Strength In JavaScript Using Html and CSS projects with source code available for you to copy and paste directly into your own project.

<main>
<form action="#">
<div>
<label for="password">Password</label>
<input id="password" class="js--password" type="password" placeholder="Enter your password here.">
<div class="password-meter">
<div class="password-meter__bar"> <div class="password-meter__bar__inner js--password-bar">
</div>
</div>
<p class="password-meter__label">Password Strength: <span class="js--password-text"></span></p>
</div>
</div>
<div>
<input type="submit" value="Submit">
</div>
</form>
</main>

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There is all the HTML code for the password strength checker. Now, you can see an output with a password strength checker then we write javascript for the password strength checker.

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output

 

CSS code for Check Password Strength

*,
*::before,
*::after {
    box-sizing: border-box;
    transition: all 0.1s;
    margin: 0;
}

html,
body {
    margin: 0;
    padding: 0;
}

html {
    font-size: 62.5%;
}

body {
    color: #222;
    background: #fafafa;
    font-family: sans-serif;
    font-size: 1.6rem;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main {
    width: 90%;
    max-width: 80rem;
    margin: 0 auto;
    padding: 3rem 0;
}

form {
    width: 100%;
    background: #fff;
    box-shadow: 0 0.3rem 2rem -0.5rem rgba(0, 0, 0, 0.2);
    padding: 3rem;
}

form>div:not( :last-child) {
    margin-bottom: 3rem;
}

form label {
    display: block;
    color: #4b7bec;
    margin-bottom: 1rem;
    font-size: 1.2rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.05rem;
}

form input {
    width: 100%;
    display: block;
    margin: 0 auto;
    border: 0;
    font-size: 1.3rem;
}

form input[type="password"] {
    padding: 1.5rem 0;
    border-bottom: 0.1rem solid #999;
    margin-bottom: 1.5rem;
}

form input[type="password"]:hover {
    border-bottom-color: #444;
}

form input[type="password"]:focus {
    border-bottom-color: #4b7bec;
}

form input[type="submit"] {
    max-width: 15rem;
    border-radius: 2rem;
    color: #fff;
    background: #4b7bec;
    line-height: 4rem;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
}

form input[type="submit"]:hover,
form input[type="submit"]:focus {
    background: #3867d6;
}

.password-meter {
    width: 100%;
}

.password-meter__bar {
    width: 33.333%;
    height: 1rem;
    background: #eee;
    margin-bottom: 1rem;
    position: relative;
}

.password-meter__bar__inner {
    width: 0;
    height: 100%;
    display: block;
    position: absolute;
    top: 0;
    left 0;
}

.password-meter__label {
    color: #666;
    font-size: 1.2rem;
}

.password-meter__label span {
    font-weight: bold;
}

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CSS Updated output

Javascript code for Check Password Strength

( () => {
/**
* Parse a password string into a numeric value.
*
* @param {string} password
* @return {number}
*/
let evaluatePassword = ( password ) => {
let score = 0;
score = password.length;
score = ( password.match( /[!]/gmi ) ) ? score + ( password.match( /[!]/gmi ).length * 3 ) : score;
score = ( password.match( /[A-Z]/gm ) ) ? score + 3 : score;
score = ( password.match( /[0-9]/gmi ) ) ? score + 3 : score;
return score;
};
/**
* Convert a numeric score into an object of 'DOM update' data.
*
* @param {number} score
* @return {Object}
*/
let scoreToData = ( score ) => {
if ( score >= 30 ) {
return {
width: '100%',
color: '#26de81',
label: 'Strong',
};
} else if ( score >= 20 ) {
return {
width: '66%',
color: '#fd9644',
label: 'Medium',
};
} else {
return {
width: '33%',
color: '#fc5c65',
label: 'Weak',
};
}
};
window.addEventListener( 'DOMContentLoaded', () => {
// Get element refs.
let p = document.querySelector( '.js--password' );
let b = document.querySelector( '.js--password-bar' );
let t = document.querySelector( '.js--password-text' );
// Listen for updates to password field.
p.addEventListener( 'input', () => {
// Convert current value to data.
let data = scoreToData( evaluatePassword( p.value ) );
// Update DOM.
b.style.width = data.width;
b.style.background = data.color;
t.innerText = data.label;
} );
} );
} )();

Final output