How to edit a JavaScript alert box title?

It's not possible to edit a JavaScript alert box title due to security restrictions in web browsers. The native alert() function creates a modal dialog with a predefined title (usually "Alert" or the domain name) that cannot be customized.

To create custom alert boxes with editable titles, you need to use alternative approaches like custom JavaScript modal dialogs, CSS frameworks, or specialized libraries.

Why Native Alerts Can't Be Customized

Browser security policies prevent websites from modifying the alert dialog's appearance to avoid phishing attacks and maintain user trust. The title always shows the browser's default text or domain name.

// Native alert - title cannot be changed
alert("This is a standard alert message");

Using SweetAlert2 for Custom Titles

SweetAlert2 is a popular library that provides beautiful, customizable alert boxes with editable titles.

// Include SweetAlert2 library first
// <script src="https://cdn.jsdelivr.net/npm/sweetalert2@11"></script>

Swal.fire({
    title: 'Custom Alert Title',
    text: 'This alert has a custom title!',
    icon: 'success',
    confirmButtonText: 'OK'
});

Creating Custom Modal with Pure JavaScript

You can build your own custom alert modal using HTML, CSS, and JavaScript:

function customAlert(title, message) {
    // Create modal elements
    const modal = document.createElement('div');
    modal.style.cssText = `
        position: fixed; top: 0; left: 0; width: 100%; height: 100%;
        background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center;
    `;
    
    const alertBox = document.createElement('div');
    alertBox.style.cssText = `
        background: white; padding: 20px; border-radius: 8px; text-align: center;
        min-width: 300px; box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    `;
    
    alertBox.innerHTML = `
        <h3 style="margin: 0 0 10px 0; color: #333;">${title}</h3>
        <p style="margin: 0 0 20px 0;">${message}</p>
        <button onclick="this.closest('[style*=fixed]').remove()" 
                style="padding: 8px 16px; background: #007bff; color: white; border: none; border-radius: 4px; cursor: pointer;">
            OK
        </button>
    `;
    
    modal.appendChild(alertBox);
    document.body.appendChild(modal);
}

// Usage
customAlert("Success!", "Your operation completed successfully.");

Comparison of Alert Methods

Conclusion

While native JavaScript alerts cannot have custom titles due to security restrictions, libraries like SweetAlert2 or custom modal dialogs provide excellent alternatives for creating personalized alert boxes with custom titles and styling.