Create QR Code Reader or Scanner using JavaScript

Hello Dev,

In this blog, I will show you how to create QR Code Reader using JavaScript. I use API QR Code Generator to Create QR Code Reader. below code can help you to create QR Code Reader.

HTML Code

<!DOCTYPE html>
<html lang="en" dir="ltr">
   <head>
      <meta charset="utf-8">
      <title>QR Code Scanner or Reader</title>
      <link rel="stylesheet" href="styles.css">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <!-- Font Awesome CDN Link for Icons -->
      <link rel="stylesheet"
         href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.1/css/all.min.css">
   </head>
   <body>
      <div class="wrapper">
         <form action="#">
            <input type="file" hidden>
            <img src="#" alt="qr-code">
            <div class="content">
               <i class="fas fa-cloud-upload"></i>
               <p>Upload QR Code to Read</p>
            </div>
         </form>
         <div class="details">
            <textarea spellcheck="false" disabled></textarea>
            <div class="buttons">
               <button class="close">Close</button>
               <button class="copy">Copy Text</button>
            </div>
         </div>
      </div>

      <script src="script.js"></script>
   </body>
</html>

CSS

/* Import Google Font - Poppins */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 0 10px;
    background: #E3F2FD;
}

.wrapper {
    height: 270px;
    width: 420px;
    border-radius: 7px;
    background: #0B85FF;
    padding: 30px 30px 35px;
    transition: height 0.2s ease;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.wrapper.active {
    height: 525px;
}

.wrapper form {
    height: 210px;
    display: flex;
    cursor: pointer;
    user-select: none;
    text-align: center;
    border-radius: 7px;
    background: #fff;
    align-items: center;
    justify-content: center;
    transition: height 0.2s ease;
}

.wrapper.active form {
    height: 225px;
    pointer-events: none;
}

form img {
    display: none;
    max-width: 148px;
}

.wrapper.active form img {
    display: block;
}

.wrapper.active form .content {
    display: none;
}

form .content i {
    color: #0B85FF;
    font-size: 55px;
}

form .content p {
    color: #0B85FF;
    margin-top: 15px;
    font-size: 16px;
}

.wrapper .details {
    opacity: 0;
    margin-top: 25px;
    pointer-events: none;
}

.wrapper.active .details {
    opacity: 1;
    pointer-events: auto;
    transition: opacity 0.5s 0.05s ease;
}

.details textarea {
    width: 100%;
    height: 128px;
    outline: none;
    resize: none;
    color: #fff;
    font-size: 18px;
    background: none;
    border-radius: 5px;
    padding: 10px 15px;
    border: 1px solid #fff;
}

textarea::-webkit-scrollbar {
    width: 0px;
}

textarea:hover::-webkit-scrollbar {
    width: 5px;
}

textarea:hover::-webkit-scrollbar-track {
    background: none;
}

textarea:hover::-webkit-scrollbar-thumb {
    background: #fff;
    border-radius: 8px;
}

.details .buttons {
    display: flex;
    margin-top: 20px;
    align-items: center;
    justify-content: space-between;
}

.buttons button {
    height: 55px;
    outline: none;
    border: none;
    font-weight: 500;
    font-size: 16px;
    cursor: pointer;
    color: #0B85FF;
    border-radius: 5px;
    background: #fff;
    transition: transform 0.3s ease;
    width: calc(100% / 2 - 10px);
}

.buttons button:active {
    transform: scale(0.95);
}

@media (max-width: 450px) {
    .wrapper {
        padding: 25px;
        height: 260px;
    }

    .wrapper.active {
        height: 520px;
    }
}

JavaScript

const wrapper = document.querySelector(".wrapper"),
    form = document.querySelector("form"),
    fileInp = form.querySelector("input"),
    infoText = form.querySelector("p"),
    closeBtn = document.querySelector(".close"),
    copyBtn = document.querySelector(".copy");

function fetchRequest(file, formData) {
    infoText.innerText = "Scanning QR Code...";
    fetch("http://api.qrserver.com/v1/read-qr-code/", {
        method: 'POST', body: formData
    }).then(res => res.json()).then(result => {
        result = result[0].symbol[0].data;
        infoText.innerText = result ? "Upload QR Code to Scan" : "Couldn't scan QR Code";
        if (!result) return;
        document.querySelector("textarea").innerText = result;
        form.querySelector("img").src = URL.createObjectURL(file);
        wrapper.classList.add("active");
    }).catch(() => {
        infoText.innerText = "Couldn't scan QR Code";
    });
}

fileInp.addEventListener("change", async e => {
    let file = e.target.files[0];
    if (!file) return;
    let formData = new FormData();
    formData.append('file', file);
    fetchRequest(file, formData);
});

copyBtn.addEventListener("click", () => {
    let text = document.querySelector("textarea").textContent;
    navigator.clipboard.writeText(text);
});

form.addEventListener("click", () => fileInp.click());
closeBtn.addEventListener("click", () => wrapper.classList.remove("active"));

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Create QR Code Reader or Scanner using JavaScript

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