devdunia/jwt-decoder.html at main · echobash/devdunia · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="icon" type="image/png" href="images/logo.png">
    <link rel="apple-touch-icon" href="images/logo.png">
    <title>JWT Decoder - Developer Toolkit | DevDunia</title>
    <meta name="description" content="Decode and verify JWT tokens. Free online JWT decoder with header and payload analysis for developers.">
    <script src="https://cdn.tailwindcss.com"></script>
    <script src="js/common.js"></script>
    <style>
        body {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
        }
    </style>
</head>
<body class="h-screen lg:ml-72">
    <!-- Background: Consistent Subtle Dark Gradient -->
    <div class="fixed inset-0 -z-10 bg-gradient-to-br from-gray-900 via-slate-900 to-gray-900"></div>

    <!-- Main Content -->
    <div class="main-content">
        <!-- Main Container -->
        <div class="container mx-auto px-4 pt-8 pb-24 sm:px-6 lg:px-8">

        <!-- Page Header -->
        <div class="text-center mb-12">
            <h1 class="text-3xl sm:text-4xl font-bold mb-4 tracking-tight
                       text-transparent bg-clip-text bg-gradient-to-r from-blue-400 to-cyan-500">
                JWT Decoder
            </h1>
            <p class="text-lg text-gray-400 max-w-2xl mx-auto">
                Decode and analyze JWT tokens. View header, payload, and signature information.
            </p>
        </div>

        <!-- Tool Container -->
        <div class="max-w-4xl mx-auto">
            <div class="bg-slate-800/70 backdrop-blur-md rounded-lg shadow-lg border border-slate-700/60 p-6">

                <!-- Input Section -->
                <div class="mb-6">
                    <label for="jwt-input" class="block text-sm font-medium text-gray-300 mb-2">
                        JWT Token
                    </label>
                    <textarea
                        id="jwt-input"
                        rows="4"
                        class="w-full px-4 py-3 bg-slate-700/50 border border-slate-600 rounded-lg text-gray-200 placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none font-mono text-sm"
                        placeholder="Enter your JWT token here (e.g., eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...)"
                    ></textarea>
                </div>

                <!-- Action Buttons -->
                <div class="flex flex-wrap gap-3 mb-6">
                    <button id="decode-btn" class="px-6 py-3 bg-blue-600 hover:bg-blue-700 text-white font-medium rounded-lg transition-colors duration-200 flex items-center space-x-2">
                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 11V7a4 4 0 118 0m-4 8v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2z"></path>
                        </svg>
                        <span>Decode JWT</span>
                    </button>

                    <button class="clear-btn px-6 py-3 bg-slate-600 hover:bg-slate-700 text-white font-medium rounded-lg transition-colors duration-200 flex items-center space-x-2">
                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
                        </svg>
                        <span>Clear All</span>
                    </button>
                </div>

                <!-- Results Section -->
                <div id="results-section" class="hidden">

                    <!-- Token Info -->
                    <div class="mb-6 p-4 bg-slate-700/30 rounded-lg border border-slate-600/50">
                        <h3 class="text-lg font-semibold text-blue-400 mb-3">Token Information</h3>
                        <div class="grid grid-cols-1 md:grid-cols-3 gap-4 text-sm">
                            <div>
                                <span class="text-gray-400">Algorithm:</span>
                                <span id="algorithm" class="text-white font-mono ml-2">-</span>
                            </div>
                            <div>
                                <span class="text-gray-400">Type:</span>
                                <span id="token-type" class="text-white font-mono ml-2">-</span>
                            </div>
                            <div>
                                <span class="text-gray-400">Expires:</span>
                                <span id="expires" class="text-white font-mono ml-2">-</span>
                            </div>
                        </div>
                    </div>

                    <!-- Header Section -->
                    <div class="mb-6">
                        <div class="flex items-center justify-between mb-3">
                            <h3 class="text-lg font-semibold text-green-400">Header</h3>
                            <button class="copy-btn px-3 py-1 bg-slate-600 hover:bg-slate-700 text-white text-sm rounded transition-colors duration-200 flex items-center space-x-1" data-target="header-output">
                                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v8a2 2 0 01-2 2h-2m-6-4l2 2m0 0l2-2m-2 2V10"></path>
                                </svg>
                                <span>Copy</span>
                            </button>
                        </div>
                        <textarea
                            id="header-output"
                            rows="6"
                            class="w-full px-4 py-3 bg-slate-700/50 border border-slate-600 rounded-lg text-gray-200 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none font-mono text-sm"
                            readonly
                        ></textarea>
                    </div>

                    <!-- Payload Section -->
                    <div class="mb-6">
                        <div class="flex items-center justify-between mb-3">
                            <h3 class="text-lg font-semibold text-purple-400">Payload</h3>
                            <button class="copy-btn px-3 py-1 bg-slate-600 hover:bg-slate-700 text-white text-sm rounded transition-colors duration-200 flex items-center space-x-1" data-target="payload-output">
                                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v8a2 2 0 01-2 2h-2m-6-4l2 2m0 0l2-2m-2 2V10"></path>
                                </svg>
                                <span>Copy</span>
                            </button>
                        </div>
                        <textarea
                            id="payload-output"
                            rows="8"
                            class="w-full px-4 py-3 bg-slate-700/50 border border-slate-600 rounded-lg text-gray-200 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none font-mono text-sm"
                            readonly
                        ></textarea>
                    </div>

                    <!-- Signature Section -->
                    <div class="mb-6">
                        <div class="flex items-center justify-between mb-3">
                            <h3 class="text-lg font-semibold text-orange-400">Signature</h3>
                            <button class="copy-btn px-3 py-1 bg-slate-600 hover:bg-slate-700 text-white text-sm rounded transition-colors duration-200 flex items-center space-x-1" data-target="signature-output">
                                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v8a2 2 0 01-2 2h-2m-6-4l2 2m0 0l2-2m-2 2V10"></path>
                                </svg>
                                <span>Copy</span>
                            </button>
                        </div>
                        <textarea
                            id="signature-output"
                            rows="3"
                            class="w-full px-4 py-3 bg-slate-700/50 border border-slate-600 rounded-lg text-gray-200 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none font-mono text-sm"
                            readonly
                        ></textarea>
                    </div>

                </div>

                <!-- Error Display -->
                <div id="error-section" class="hidden mb-6 p-4 bg-red-900/30 border border-red-600/50 rounded-lg">
                    <div class="flex items-center space-x-2">
                        <svg class="w-5 h-5 text-red-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                        </svg>
                        <span class="text-red-400 font-medium">Error:</span>
                        <span id="error-message" class="text-red-300"></span>
                    </div>
                </div>

                <!-- Examples Section -->
                <div class="mt-8 p-4 bg-slate-700/30 rounded-lg border border-slate-600/50">
                    <h3 class="text-lg font-semibold text-blue-400 mb-3">JWT Structure</h3>
                    <div class="text-sm text-gray-300 space-y-2">
                        <p>A JWT token consists of three parts separated by dots (.)</p>
                        <div class="bg-slate-800/50 p-3 rounded font-mono text-xs">
                            <span class="text-green-400">header</span>.<span class="text-purple-400">payload</span>.<span class="text-orange-400">signature</span>
                        </div>
                        <ul class="list-disc list-inside ml-4 space-y-1">
                            <li><strong>Header:</strong> Contains metadata about the token (algorithm, type)</li>
                            <li><strong>Payload:</strong> Contains the claims (user data, expiration, etc.)</li>
                            <li><strong>Signature:</strong> Used to verify the token hasn't been tampered with</li>
                        </ul>
                    </div>
                </div>

            </div>
        </div>

    </div>

        </div>

        <!-- Footer include -->
    <div id="footer"></div>
    <script>
    fetch("footer.html")
    .then(response => response.text())
    .then(data => {
        document.getElementById("footer").innerHTML = data;
    })
    .catch(err => console.error("Failed to load footer:", err));
    </script>
    </div>

    <script>
        document.addEventListener('DOMContentLoaded', function() {
            const jwtInput = document.getElementById('jwt-input');
            const decodeBtn = document.getElementById('decode-btn');
            const resultsSection = document.getElementById('results-section');
            const errorSection = document.getElementById('error-section');
            const errorMessage = document.getElementById('error-message');

            // Decode JWT
            decodeBtn.addEventListener('click', function() {
                const token = jwtInput.value.trim();
                if (!token) {
                    showError('Please enter a JWT token');
                    return;
                }

                try {
                    const decoded = decodeJWT(token);
                    displayResults(decoded);
                    hideError();
                } catch (error) {
                    showError(error.message);
                    hideResults();
                }
            });

            // Helper functions
            function showError(message) {
                errorMessage.textContent = message;
                errorSection.classList.remove('hidden');
            }

            function hideError() {
                errorSection.classList.add('hidden');
            }

            function showResults() {
                resultsSection.classList.remove('hidden');
            }

            function hideResults() {
                resultsSection.classList.add('hidden');
            }

            function displayResults(decoded) {
                // Update token info
                document.getElementById('algorithm').textContent = decoded.header.alg || 'Unknown';
                document.getElementById('token-type').textContent = decoded.header.typ || 'JWT';

                if (decoded.payload.exp) {
                    const expDate = new Date(decoded.payload.exp * 1000);
                    const now = new Date();
                    const isExpired = expDate < now;
                    document.getElementById('expires').textContent =
                        `${expDate.toLocaleString()} ${isExpired ? '(Expired)' : '(Valid)'}`;
                } else {
                    document.getElementById('expires').textContent = 'No expiration';
                }

                // Display header
                document.getElementById('header-output').value = JSON.stringify(decoded.header, null, 2);

                // Display payload
                document.getElementById('payload-output').value = JSON.stringify(decoded.payload, null, 2);

                // Display signature
                document.getElementById('signature-output').value = decoded.signature;

                showResults();
            }

            function decodeJWT(token) {
                // Remove any whitespace
                token = token.trim();

                // Split the token
                const parts = token.split('.');
                if (parts.length !== 3) {
                    throw new Error('Invalid JWT format. JWT must have 3 parts separated by dots.');
                }

                const [headerPart, payloadPart, signaturePart] = parts;

                try {
                    // Decode header
                    const header = JSON.parse(atob(headerPart.replace(/-/g, '+').replace(/_/g, '/')));

                    // Decode payload
                    const payload = JSON.parse(atob(payloadPart.replace(/-/g, '+').replace(/_/g, '/')));

                    return {
                        header,
                        payload,
                        signature: signaturePart
                    };
                } catch (error) {
                    throw new Error('Failed to decode JWT. Please check if the token is valid.');
                }
            }

            // Example on page load
            window.addEventListener('load', () => {
                const exampleJWT = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyLCJleHAiOjE1MTYyNDI2MjJ9.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c';
                jwtInput.value = exampleJWT;
            });
        });
    </script>
    <!-- Include Final Sidebar -->
    <div id="sidebar-container"></div>
    <script>
        // Load final_sidebar.html content
        fetch('final_sidebar.html')
            .then(response => response.text())
            .then(html => {
                document.getElementById('sidebar-container').innerHTML = html;
            })
            .catch(error => {
                console.error('Error loading sidebar:', error);
            });
    </script>
</body>
</html>