Redirect Checker | Detect Client-Side Redirects

Redirect Checker

Detect client-side redirects in HTML snippets

HTML Input

Paste your HTML snippet to analyze:

<i class="fas fa-search"></i> Analyze for Redirects
                </button>
                
                <button id="clearBtn" class="btn btn-secondary" style="width: 100%; margin-top: 10px;">
                    <i class="fas fa-trash"></i> Clear Input
                </button>
            </div>
            
            <div class="card">
                <div class="card-header">
                    <h2 class="card-title">Analysis Results</h2>
                    <div class="card-icon">
                        <i class="fas fa-clipboard-check"></i>
                    </div>
                </div>
                
                <div id="resultsContainer">
                    <div class="result-box">
                        <div class="result-title">
                            <i class="fas fa-info-circle"></i> No HTML analyzed yet
                        </div>
                        <div class="result-content">
                            Paste your HTML in the input box and click “Analyze for Redirects” to check for client-side redirects.
                        </div>
                    </div>
                </div>
                
                <div class="redirect-info">
                    <h4><i class="fas fa-lightbulb"></i> About Client-Side Redirects</h4>
                    <p>Client-side redirects happen in the browser rather than on the server. They can impact:</p>
                    <ul>
                        <li>SEO performance</li>
                        <li>Page load speed</li>
                        <li>User experience</li>
                    </ul>
                </div>
            </div>
        </div>

<div class="features">
            <div class="feature-card">
                <div class="feature-icon">
                    <i class="fas fa-lock"></i>
                </div>
                <div class="feature-text">
                    <h3>100% Client-Side</h3>
                    <p>All processing happens in your browser – no data leaves your computer.</p>
                </div>
            </div>
            
            <div class="feature-card">
                <div class="feature-icon">
                    <i class="fas fa-moon"></i>
                </div>
                <div class="feature-text">
                    <h3>Dark & Light Mode</h3>
                    <p>Eye-friendly interface with theme toggle for comfortable extended use.</p>
                </div>
            </div>
            
            <div class="feature-card">
                <div class="feature-icon">
                    <i class="fas fa-tools"></i>
                </div>
                <div class="feature-text">
                    <h3>Advanced Detection</h3>
                    <p>Identifies meta refresh, JavaScript, and other client-side redirect methods.</p>
                </div>
            </div>
        </div>

<div class="info-section">
            <h2><i class="fas fa-info-circle"></i> About Client-Side Redirects</h2>
            <div class="info-content">
                <div class="info-box">
                    <h3><i class="fas fa-exclamation-triangle"></i> Common Issues</h3>
                    <ul>
                        <li>Meta refresh tags can hurt SEO if not used properly</li>
                        <li>JavaScript redirects may not be crawled by search engines</li>
                        <li>Multiple redirects slow down page loading</li>
                        <li>Can create poor user experience if not implemented well</li>
                        <li>May trigger browser warnings for immediate redirects</li>
                    </ul>
                </div>
                
                <div class="info-box">
                    <h3><i class="fas fa-check-circle"></i> Best Practices</h3>
                    <ul>
                        <li>Use server-side redirects (301/302) when possible</li>
                        <li>If using meta refresh, set delay to at least 3 seconds</li>
                        <li>Provide immediate content before JavaScript redirects</li>
                        <li>Avoid redirect chains (multiple consecutive redirects)</li>
                        <li>Test redirects on different devices and browsers</li>
                    </ul>
                </div>
            </div>
        </div>
        
        <footer>
            <p>© 2025 GNServices Ltd. MultiTool – Free Online Document Tools | All rights reserved</p>
            <p>Your privacy is our priority – files are never uploaded to any server</p>
        </footer>
    </div>
    
    <div class="toast" id="toast">Analysis complete!</div>

// Theme toggle functionality
            const themeToggle = document.getElementById('themeToggle');
            const prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)');
            const icon = themeToggle.querySelector('i');
            
            // Check for saved theme preference or use system preference
            const currentTheme = localStorage.getItem('theme') || 
                                (prefersDarkScheme.matches ? 'dark' : 'light');
            
            if (currentTheme === 'dark') {
                document.body.setAttribute('data-theme', 'dark');
                icon.className = 'fas fa-sun';
                themeToggle.querySelector('span').textContent = 'Light Mode';
            }

themeToggle.addEventListener('click', function() {
                if (document.body.getAttribute('data-theme') !== 'dark') {
                    document.body.setAttribute('data-theme', 'dark');
                    localStorage.setItem('theme', 'dark');
                    icon.className = 'fas fa-sun';
                    themeToggle.querySelector('span').textContent = 'Light Mode';
                } else {
                    document.body.removeAttribute('data-theme');
                    localStorage.setItem('theme', 'light');
                    icon.className = 'fas fa-moon';
                    themeToggle.querySelector('span').textContent = 'Dark Mode';
                }
            });

// Tool functionality
            const htmlInput = document.getElementById('htmlInput');
            const analyzeBtn = document.getElementById('analyzeBtn');
            const clearBtn = document.getElementById('clearBtn');
            const resultsContainer = document.getElementById('resultsContainer');
            const toast = document.getElementById('toast');

// Analyze button click
            analyzeBtn.addEventListener('click', analyzeHTML);
            
            // Clear button click
            clearBtn.addEventListener('click', function() {
                htmlInput.value = '';
                resultsContainer.innerHTML = `
                    <div class="result-box">
                        <div class="result-title">
                            <i class="fas fa-info-circle"></i> No HTML analyzed yet
                        </div>
                        <div class="result-content">
                            Paste your HTML in the input box and click "Analyze for Redirects" to check for client-side redirects.
                        </div>
                    </div>
                `;
                showToast('Input cleared');
            });

// Analyze HTML function
            function analyzeHTML() {
                const html = htmlInput.value.trim();
                
                if (!html) {
                    showToast('Please enter some HTML to analyze');
                    return;
                }
                
                // Create a DOM parser
                const parser = new DOMParser();
                const doc = parser.parseFromString(html, 'text/html');
                
                // Check for different types of redirects
                const redirects = [];
                
                // 1. Check for meta refresh redirect
                const metaRefresh = doc.querySelector('meta[http-equiv="refresh"], meta[http-equiv="Refresh"]');
                if (metaRefresh) {
                    const content = metaRefresh.getAttribute('content') || '';
                    const match = content.match(/(\d*)\s*;\s*url\s*=\s*(.*)/i);
                    if (match) {
                        const delay = match[1] || '0';
                        const url = match[2].replace(/['"]/g, '');
                        redirects.push({
                            type: 'Meta Refresh',
                            code: metaRefresh.outerHTML,
                            details: `Redirects to ${url} after ${delay} seconds`,
                            severity: delay === '0' ? 'warning' : 'info'
                        });
                    }
                }
                
                // 2. Check for JavaScript redirects
                const scripts = doc.querySelectorAll('script');
                const jsRedirects = [];
                
                scripts.forEach(script => {
                    const scriptText = script.textContent || script.innerText;
                    
                    // Check for window.location redirects
                    if (scriptText.includes('window.location') || scriptText.includes('location.href') || scriptText.includes('location.replace')) {
                        const lines = scriptText.split('\n');
                        const redirectLines = lines.filter(line => 
                            line.includes('window.location') || 
                            line.includes('location.href') || 
                            line.includes('location.replace')
                        );
                        
                        redirectLines.forEach(line => {
                            const cleanLine = line.trim().replace(/\s+/g, ' ');
                            jsRedirects.push({
                                type: 'JavaScript Redirect',
                                code: cleanLine,
                                details: 'Immediate redirect via JavaScript',
                                severity: 'warning'
                            });
                        });
                    }
                    
                    // Check for meta http-equiv injection
                    if (scriptText.includes('meta') && scriptText.includes('http-equiv="refresh"')) {
                        jsRedirects.push({
                            type: 'JavaScript Meta Injection',
                            code: scriptText.split('\n').find(l => l.includes('meta') && l.includes('http-equiv="refresh"')).trim(),
                            details: 'Dynamically injects meta refresh tag',
                            severity: 'warning'
                        });
                    }
                });
                
                // Add all JS redirects
                redirects.push(...jsRedirects);
                
                // 3. Check for iframe redirects
                const iframes = doc.querySelectorAll('iframe');
                iframes.forEach(iframe => {
                    const src = iframe.getAttribute('src');
                    if (src && (src.startsWith('http') || src.startsWith('//'))) {
                        redirects.push({
                            type: 'Iframe Redirect',
                            code: iframe.outerHTML,
                            details: `Loads content from ${src}`,
                            severity: 'info'
                        });
                    }
                });
                
                // 4. Check for link rel="canonical" (not exactly a redirect but related)
                const canonical = doc.querySelector('link[rel="canonical"]');
                if (canonical) {
                    const href = canonical.getAttribute('href');
                    redirects.push({
                        type: 'Canonical URL',
                        code: canonical.outerHTML,
                        details: `Indicates preferred URL: ${href}`,
                        severity: 'info'
                    });
                }
                
                // Display results
                displayResults(redirects);
                
                showToast(`Found ${redirects.length} redirect(s)`);
            }
            
            function displayResults(redirects) {
                if (redirects.length === 0) {
                    resultsContainer.innerHTML = `
                        <div class="result-box">
                            <div class="result-title">
                                <i class="fas fa-check-circle"></i> No Redirects Found
                            </div>
                            <div class="result-content">
                                No client-side redirects were detected in the provided HTML.
                            </div>
                        </div>
                    `;
                    return;
                }
                
                let resultsHTML = '';
                
                redirects.forEach((redirect, index) => {
                    const badgeClass = `${redirect.severity}-badge`;
                    const icon = redirect.severity === 'warning' ? 'fa-exclamation-triangle' : 
                                redirect.severity === 'error' ? 'fa-times-circle' : 'fa-info-circle';
                    
                    resultsHTML += `
                        <div class="result-box">
                            <div class="result-title">
                                <i class="fas ${icon}"></i> ${redirect.type}
                                <span class="badge ${badgeClass}" style="margin-left: auto;">
                                    ${redirect.severity.charAt(0).toUpperCase() + redirect.severity.slice(1)}
                                </span>
                            </div>
                            <div class="result-content">
                                ${escapeHtml(redirect.code)}
                            </div>
                            <div style="margin-top: 10px; font-size: 0.9rem;">
                                <i class="fas fa-info-circle"></i> ${redirect.details}
                            </div>
                        </div>
                    `;
                });
                
                resultsContainer.innerHTML = resultsHTML;
            }
            
            function escapeHtml(unsafe) {
                return unsafe
                    .replace(/&/g, "&")
                    .replace(/</g, "<")
                    .replace(/>/g, ">")
                    .replace(/"/g, """)
                    .replace(/'/g, "'");
            }
            
            function showToast(message) {
                toast.textContent = message;
                toast.classList.add('show');
                
                setTimeout(() => {
                    toast.classList.remove('show');
                }, 3000);
            }
        });
    </script>
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