A program that will ask the user to give a string or a sentence and then the program will count the number of consonants and vowels using JavaScript programming language.

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Program Listing
<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Count Consonants and Vowels Using JavaScript</title>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #cacaca;
            color: #04181F;
            font-family: sans-serif;
            font-size: 90%;
        main {
            padding: 30px;
            border-radius: 10px;
            background-color: #f1f1f1;
            width: 450px;
        h1 {
            margin-bottom: 5px;
            font-size: 26px;
            text-align: center;
        h2 {
            margin-bottom: 30px;
            font-size: 20px;
            text-align: center;
        .block {
            margin: 0 auto 12px;
            display: flex;
            align-items: center;
        label {
            display: block;
            line-height: 40px;
            background-color: #47356E;
            color: #eee;
            text-align: center;
        textarea {
            padding: 10px;
            width: 100%;
            font-size: 14px;
            border-radius: 0;
            border: 2px solid #04181F;
            outline: none;
            resize: none;
            text-align: center;
            margin: 0;
        button {
            display: inline-block;
            padding: 15px;
            background-color: #F68802;
            color: #eee;
            outline: none; 
            border: none;
            cursor: pointer;
            width: 100%;
            font-size: 16px;
            text-decoration: none;
            text-align: center;
            transition: all .2s;
            margin-top: 5px;
        button:hover {
            opacity: 0.9;
        .output {
            display: block;
            width: 100%;
            margin-top: 12px;
            padding: 20px 0;
            background-color: #2F4C58;
            font-size: 16px;
            color: #f3f3f3;
            line-height: 1.5;
        .hide {
            display: none;
    <main class="container">
        <h1>Count Consonants and Vowels<br>Using JavaScript</h1>
        <h2>Jake R. Pomperada, MAED-IT, MIT</h2>
        <form action="" id="frmCount">
            <label for="grade1">Enter a sentence:</label>
            <textarea name="" id="txtContent" rows="3" required></textarea>
            <button type="submit">Count</button>
            <div class="output hide"></div>

        document.querySelector('#frmCount').onsubmit  = (e) => {

            let content = document.querySelector('#txtContent').value,
                output = document.querySelector('.output'),
                countConsonants = () => {
                    return content.match(/[^aeiou\s]/gi).length
                countVowels = () => {
                    return content.match(/[aeiou]/gi).length

            output.innerHTML = 'Number of Vowels: '+countVowels()+'<br>'+
                               'Number of Consonants: '+countConsonants()+'<br>'

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