devdunia/base62-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>Base62 Decoder - Developer Toolkit | DevDunia</title>
    <meta name="description" content="Decode Base62 encoded data back to original format. Free online Base62 decoder tool 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 -->
    <div class="fixed inset-0 -z-10 bg-gradient-to-br from-gray-900 via-slate-900 to-gray-900"></div>

    <!-- Sidebar -->
    <div id="sidebar-container"></div>

    <!-- Main Content -->
    <div class="main-content">
        <div class="relative z-10 container mx-auto px-4 pt-16 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">
                    Base62 Decoder
                </h1>
                <p class="text-lg text-gray-400 max-w-2xl mx-auto">
                    Decode Base62 encoded data back to its original format.
                </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="base62-input" class="block text-sm font-medium text-gray-300 mb-2">
                            Base62 Input
                        </label>
                        <textarea
                            id="base62-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 Base62 encoded string to decode..."
                        ></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="M17 16l-4 4m0 0l-4-4m4 4V4"></path>
                            </svg>
                            <span>Decode from Base62</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>

                    <!-- Error Display -->
                    <div id="error-display" class="hidden mb-6 p-4 bg-red-900/50 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 id="error-message" class="text-red-300"></span>
                        </div>
                    </div>

                    <!-- Output Section -->
                    <div id="output-section" class="hidden">
                        <label for="base62-output" class="block text-sm font-medium text-gray-300 mb-2">
                            Decoded Result
                        </label>
                        <div class="relative">
                            <textarea
                                id="base62-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>

                            <!-- Copy Button -->
                            <button class="copy-btn absolute top-2 right-2 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="base62-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>

                        <!-- Stats -->
                        <div class="mt-3 flex flex-wrap gap-4 text-sm text-gray-400">
                            <div class="flex items-center space-x-2">
                                <span>Base62 Size:</span>
                                <span id="base62-size" class="text-blue-400 font-medium">0 B</span>
                            </div>
                            <div class="flex items-center space-x-2">
                                <span>Decoded Size:</span>
                                <span id="decoded-size" class="text-green-400 font-medium">0 B</span>
                            </div>
                            <div class="flex items-center space-x-2">
                                <span>Compression:</span>
                                <span id="compression" class="text-purple-400 font-medium">0%</span>
                            </div>
                        </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-cyan-400 mb-3">Common Examples</h3>
                        <div class="grid grid-cols-1 md:grid-cols-2 gap-4 text-sm">
                            <div>
                                <p class="text-gray-300 font-medium mb-2">Encoded text:</p>
                                <p class="text-gray-400">Base62 string</p>
                                <p class="text-gray-500">→ Decoded back to readable text</p>
                            </div>
                            <div>
                                <p class="text-gray-300 font-medium mb-2">Encoded JSON:</p>
                                <p class="text-gray-400">Base62 string</p>
                                <p class="text-gray-500">→ Decoded JSON payload</p>
                            </div>
                            <div>
                                <p class="text-gray-300 font-medium mb-2">Binary data:</p>
                                <p class="text-gray-400">Base62 representation</p>
                                <p class="text-gray-500">→ Decoded bytes (UTF-8 or hex)</p>
                            </div>
                            <div>
                                <p class="text-gray-300 font-medium mb-2">URL safe content:</p>
                                <p class="text-gray-400">Base62 string</p>
                                <p class="text-gray-500">→ Original payload</p>
                            </div>
                        </div>
                    </div>

                </div>
            </div>

        </div>

        <!-- Footer -->
        <footer class="text-center text-gray-500 mt-10 pb-6">
            © 2025 DevDunia – Free Developer Tools by <a href="https://echobash.com" class="text-blue-500 hover:underline" target="_blank">echobash</a>
        </footer>
    </div>

    <script>
        document.addEventListener('DOMContentLoaded', function() {
            const base62Input = document.getElementById('base62-input');
            const base62Output = document.getElementById('base62-output');
            const decodeBtn = document.getElementById('decode-btn');
            const outputSection = document.getElementById('output-section');
            const errorDisplay = document.getElementById('error-display');
            const errorMessage = document.getElementById('error-message');
            const base62Size = document.getElementById('base62-size');
            const decodedSize = document.getElementById('decoded-size');
            const compression = document.getElementById('compression');

            const base62Alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

            decodeBtn.addEventListener('click', function() {
                const input = base62Input.value.trim();
                if (!input) {
                    showError('Please enter a Base62 string to decode');
                    return;
                }

                if (!isValidBase62(input)) {
                    showError('Invalid Base62 string. Allowed characters: 0-9, A-Z, a-z');
                    return;
                }

                try {
                    const decoded = decodeFromBase62(input);
                    base62Output.value = decoded;
                    showOutput();
                    updateStats(input, decoded);
                    hideError();
                } catch (error) {
                    showError('Error decoding from Base62: ' + error.message);
                    hideOutput();
                }
            });

            function showOutput() {
                outputSection.classList.remove('hidden');
            }

            function hideOutput() {
                outputSection.classList.add('hidden');
            }

            function showError(message) {
                errorMessage.textContent = message;
                errorDisplay.classList.remove('hidden');
            }

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

            function isValidBase62(str) {
                for (let char of str) {
                    if (base62Alphabet.indexOf(char) === -1) {
                        return false;
                    }
                }
                return true;
            }

            function decodeFromBase62(input) {
                if (!input || input === base62Alphabet[0]) {
                    return '';
                }

                // Count leading zeros
                let leadingZeros = 0;
                for (let i = 0; i < input.length && input[i] === base62Alphabet[0]; i++) {
                    leadingZeros++;
                }

                let num = 0n;
                for (let i = 0; i < input.length; i++) {
                    const char = input[i];
                    const index = base62Alphabet.indexOf(char);
                    if (index === -1) {
                        throw new Error('Invalid Base62 character: ' + char);
                    }
                    num = num * 62n + BigInt(index);
                }

                const bytes = [];
                while (num > 0n) {
                    bytes.unshift(Number(num % 256n));
                    num = num / 256n;
                }

                const result = new Uint8Array(leadingZeros + bytes.length);
                for (let i = 0; i < leadingZeros; i++) {
                    result[i] = 0;
                }
                for (let i = 0; i < bytes.length; i++) {
                    result[leadingZeros + i] = bytes[i];
                }

                try {
                    return new TextDecoder().decode(result);
                } catch (e) {
                    return Array.from(result).map(b => b.toString(16).padStart(2, '0')).join(' ');
                }
            }

            function updateStats(encoded, decoded) {
                const encodedBytes = new Blob([encoded]).size;
                const decodedBytes = new Blob([decoded]).size;
                const compressionPercent = decodedBytes === 0 ? 0 : ((encodedBytes - decodedBytes) / decodedBytes * 100).toFixed(1);

                base62Size.textContent = DevDuniaUtils.formatBytes(encodedBytes);
                decodedSize.textContent = DevDuniaUtils.formatBytes(decodedBytes);
                compression.textContent = compressionPercent + '%';
            }

            window.addEventListener('load', () => {
                base62Input.value = 'AKRfxYADYEmO3sJOfsNFm2iaVur';
            });
        });
    </script>

    <!-- Include Final Sidebar -->
    <script src="sidebar.js"></script>
    <script>
        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>