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Learn to build a QR code generator in JavaScript using the QRCode.js library, with custom colors, size, logo overlay, and download as PNG functionality.
What You'll Learn
- How to use the QRCode.js library to generate QR codes
- How to customize colors, size, and error correction level
- How to add a logo overlay on top of the QR code using Canvas API
- How to download the QR code as a PNG image
- How to generate QR codes for URLs, WiFi, vCards, and plain text
Project Overview
A QR code generator takes a text input (URL, WiFi credentials, contact info) and converts it into a scannable QR code image. Behind the scenes, the QRCode.js library handles the complex encoding; your job is to wire up the UI.
Component Structure
How It Works — Flow Diagram
Step-by-Step Build
Step 1 — Load QRCode.js
Example
<!-- CDN: include in your HTML <head> -->
<script src="https://cdn.jsdelivr.net/npm/qrcodejs@1.0.0/qrcode.min.js"></script>
Step 2 — HTML Structure
Example
<div class="qr-generator">
<h1>QR Code Generator</h1>
<div class="type-tabs">
<button class="tab-btn active" data-type="url">URL</button>
<button class="tab-btn" data-type="text">Text</button>
<button class="tab-btn" data-type="wifi">WiFi</button>
<button class="tab-btn" data-type="vcard">vCard</button>
</div>
<div id="inputSection" class="input-section">
<!-- Dynamic inputs per tab -->
</div>
<div class="options-row">
<label>Size:
<select id="qrSize">
<option value="128">Small (128px)</option>
<option value="256" selected>Medium (256px)</option>
<option value="512">Large (512px)</option>
</select>
</label>
<label>Dark: <input type="color" id="colorDark" value="#000000"></label>
<label>Light:<input type="color" id="colorLight" value="#ffffff"></label>
<label>ECC:
<select id="eccLevel">
<option value="L">L (7%)</option>
<option value="M" selected>M (15%)</option>
<option value="Q">Q (25%)</option>
<option value="H">H (30%)</option>
</select>
</label>
</div>
<div id="qrDisplay" class="qr-display"></div>
<div class="qr-actions">
<button id="copyBtn" class="btn-copy" disabled>📋 Copy Image</button>
<a id="downloadBtn" class="btn-download" download="qr-code.png">⬇ Download PNG</a>
</div>
</div>
Step 3 — Tab-Based Input Templates
Example
const INPUT_TEMPLATES = {
url: () => `<input type="url" id="urlInput" placeholder="https://example.com" class="qr-input">`,
text: () => `<textarea id="textInput" rows="3" placeholder="Enter any text..." class="qr-input"></textarea>`,
wifi: () => `
<input type="text" id="ssidInput" placeholder="Network Name (SSID)" class="qr-input">
<input type="password" id="wifiPass" placeholder="Password" class="qr-input">
<select id="wifiEnc">
<option value="WPA">WPA/WPA2</option>
<option value="WEP">WEP</option>
<option value="">None</option>
</select>
`,
vcard: () => `
<input type="text" id="vcName" placeholder="Full Name" class="qr-input">
<input type="tel" id="vcPhone" placeholder="Phone Number" class="qr-input">
<input type="email" id="vcEmail" placeholder="Email" class="qr-input">
<input type="url" id="vcUrl" placeholder="Website" class="qr-input">
`
};
Step 4 — Build QR Content String
Example
let currentType = "url";
function buildContent() {
switch (currentType) {
case "url":
return document.getElementById("urlInput")?.value || "";
case "text":
return document.getElementById("textInput")?.value || "";
case "wifi": {
const ssid = document.getElementById("ssidInput")?.value || "";
const pass = document.getElementById("wifiPass")?.value || "";
const enc = document.getElementById("wifiEnc")?.value || "";
return `WIFI:T:${enc};S:${ssid};P:${pass};;`;
}
case "vcard": {
const name = document.getElementById("vcName")?.value || "";
const phone = document.getElementById("vcPhone")?.value || "";
const email = document.getElementById("vcEmail")?.value || "";
const url = document.getElementById("vcUrl")?.value || "";
return `BEGIN:VCARD\nVERSION:3.0\nFN:${name}\nTEL:${phone}\nEMAIL:${email}\nURL:${url}\nEND:VCARD`;
}
default: return "";
}
}
Step 5 — Generate QR Code
Example
let qrInstance = null;
function generate() {
const content = buildContent().trim();
if (!content) return;
const display = document.getElementById("qrDisplay");
const size = parseInt(document.getElementById("qrSize").value);
const darkC = document.getElementById("colorDark").value;
const lightC = document.getElementById("colorLight").value;
const ecc = document.getElementById("eccLevel").value;
display.innerHTML = "";
qrInstance = new QRCode(display, {
text: content,
width: size,
height: size,
colorDark: darkC,
colorLight: lightC,
correctLevel: QRCode.CorrectLevel[ecc]
});
// Enable download after a brief delay for the canvas to render
setTimeout(() => {
const canvas = display.querySelector("canvas");
if (!canvas) return;
const url = canvas.toDataURL("image/png");
document.getElementById("downloadBtn").href = url;
document.getElementById("copyBtn").disabled = false;
document.getElementById("copyBtn").dataset.url = url;
}, 100);
}
Step 6 — Copy to Clipboard
Example
document.getElementById("copyBtn").addEventListener("click", async () => {
const canvas = document.querySelector("#qrDisplay canvas");
if (!canvas) return;
canvas.toBlob(async (blob) => {
await navigator.clipboard.write([
new ClipboardItem({ "image/png": blob })
]);
document.getElementById("copyBtn").textContent = "✅ Copied!";
setTimeout(() => { document.getElementById("copyBtn").textContent = "📋 Copy Image"; }, 2000);
});
});
Step 7 — Auto-Regenerate on Input / Option Change
Example
function setupAutoGenerate() {
document.getElementById("inputSection").addEventListener("input", () => generate());
["qrSize","colorDark","colorLight","eccLevel"].forEach(id => {
document.getElementById(id).addEventListener("change", () => generate());
});
}
document.querySelector(".type-tabs").addEventListener("click", (e) => {
if (!e.target.classList.contains("tab-btn")) return;
currentType = e.target.dataset.type;
document.querySelectorAll(".tab-btn").forEach(b => b.classList.remove("active"));
e.target.classList.add("active");
document.getElementById("inputSection").innerHTML = INPUT_TEMPLATES[currentType]();
generate();
});
// Initialize
document.getElementById("inputSection").innerHTML = INPUT_TEMPLATES.url();
setupAutoGenerate();
Console Output
Output
// User types "https://wohtech.com" in URL tab
buildContent() → "https://wohtech.com"
new QRCode(display, { text: "https://wohtech.com", width: 256, ... })
→ Canvas rendered in #qrDisplay
downloadBtn.href = "data:image/png;base64,..."
// WiFi tab: SSID="HomeNet", Pass="secret123"
buildContent() → "WIFI:T:WPA;S:HomeNet;P:secret123;;"
→ QR code encodes WiFi credentials (phone can scan to connect)
// User changes ECC to H (highest error correction)
generate() → QR code regenerated with correctLevel: QRCode.CorrectLevel.H
(more modules visible — more error resilience)Edge Cases to Handle
| Situation | Expected Behavior |
|---|---|
| Empty input | Don't generate / show placeholder |
| Very long URL | QR becomes denser but still scannable at L/M ECC |
| Same dark/light color | QR invisible — warn the user |
| Canvas not supported | Fallback to <img> (QRCode.js does this automatically) |
| Copy fails (non-HTTPS) | Graceful fallback message |
Challenge Yourself
- Logo overlay — draw a centered company logo on the canvas after QR generation
- SVG export — use a library that generates SVG instead of canvas
- Batch generator — paste a list of URLs and download QR codes as a ZIP
- QR code history — show thumbnails of the last 5 generated codes
- Scan your own QR — integrate a QR scanner on the same page
Best Practices
- Use
ECC = Hwhen adding a logo overlay (30% of pixels can be obscured) - Always
display.innerHTML = ""before regenerating to remove the previous QR - Use
canvas.toDataURL("image/png")for the download link - Debounce the text input to avoid generating a QR on every keystroke
- Test the generated QR with multiple scanner apps to ensure readability
Exam Focus
Revise definitions, diagrams, examples, and short-answer points for Build a JavaScript QR Code Generator - Step by Step Project Tutorial.
Interview Use
Prepare one clear explanation, one practical example, and one common mistake for this JavaScript Master Course topic.
Search Terms
javascript-complete-guide, javascript master course, javascript, complete, guide, mini, projects, code
Related JavaScript Master Course Topics
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