html-tools/json-formatter.html at main · levups/html-tools · 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">
    <title>JSON Formatter</title>
    <link rel="stylesheet" href="common.css">
    <style>
        body { display: flex; flex-direction: column; }
        .options { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
    </style>
</head>
<body>

    <a href="index.html" class="back-link">
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <path d="M19 12H5M12 19l-7-7 7-7"/>
        </svg>
        All Tools
    </a>

    <header>
        <h1>JSON Formatter</h1>
        <p class="subtitle">Pretty print or minify JSON</p>
    </header>

    <div class="controls">
        <button id="formatBtn">Format</button>
        <button id="minifyBtn">Minify</button>
        <button id="clearBtn" class="secondary">Clear</button>
        <div class="options">
            <div class="option-group">
                <label for="indentSelect">Indent:</label>
                <select id="indentSelect">
                    <option value="2">2 spaces</option>
                    <option value="4">4 spaces</option>
                    <option value="tab">Tab</option>
                </select>
            </div>
            <div class="option-group">
                <input type="checkbox" id="sortKeys">
                <label for="sortKeys">Sort keys</label>
            </div>
        </div>
    </div>

    <div class="container">
        <div class="pane">
            <div class="pane-header">
                <span class="label">
                    <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                    </svg>
                    Input
                    <span id="statusIndicator" class="status-indicator"></span>
                </span>
            </div>
            <textarea id="inputArea" placeholder='Paste your JSON here...

Example:
{"name":"John","age":30,"city":"New York"}' spellcheck="false"></textarea>
            <div id="errorMessage" class="error-message"></div>
        </div>

        <div class="pane">
            <div class="pane-header">
                <span class="label">
                    <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                    </svg>
                    Output
                </span>
                <button id="copyBtn" class="copy-btn">Copy</button>
            </div>
            <textarea id="outputArea" readonly placeholder="Formatted JSON will appear here..." spellcheck="false"></textarea>
        </div>
    </div>

    <script>
        const inputArea = document.getElementById('inputArea');
        const outputArea = document.getElementById('outputArea');
        const formatBtn = document.getElementById('formatBtn');
        const minifyBtn = document.getElementById('minifyBtn');
        const clearBtn = document.getElementById('clearBtn');
        const copyBtn = document.getElementById('copyBtn');
        const indentSelect = document.getElementById('indentSelect');
        const sortKeysCheckbox = document.getElementById('sortKeys');
        const errorMessage = document.getElementById('errorMessage');
        const statusIndicator = document.getElementById('statusIndicator');

        function sortObjectKeys(obj) {
            if (obj === null || typeof obj !== 'object') {
                return obj;
            }
            if (Array.isArray(obj)) {
                return obj.map(sortObjectKeys);
            }
            const sorted = {};
            Object.keys(obj).sort().forEach(key => {
                sorted[key] = sortObjectKeys(obj[key]);
            });
            return sorted;
        }

        function format(minify = false) {
            const input = inputArea.value.trim();

            errorMessage.style.display = 'none';
            statusIndicator.className = 'status-indicator';

            if (!input) {
                outputArea.value = '';
                return;
            }

            try {
                let parsed = JSON.parse(input);

                if (sortKeysCheckbox.checked) {
                    parsed = sortObjectKeys(parsed);
                }

                if (minify) {
                    outputArea.value = JSON.stringify(parsed);
                } else {
                    const indentValue = indentSelect.value;
                    const indent = indentValue === 'tab' ? '\t' : parseInt(indentValue, 10);
                    outputArea.value = JSON.stringify(parsed, null, indent);
                }

                statusIndicator.className = 'status-indicator valid';
            } catch (e) {
                errorMessage.style.display = 'block';
                errorMessage.textContent = 'Invalid JSON: ' + e.message;
                outputArea.value = '';
                statusIndicator.className = 'status-indicator invalid';
            }
        }

        formatBtn.addEventListener('click', () => format(false));
        minifyBtn.addEventListener('click', () => format(true));

        // Auto-format on input
        inputArea.addEventListener('input', () => format(false));

        clearBtn.addEventListener('click', () => {
            inputArea.value = '';
            outputArea.value = '';
            errorMessage.style.display = 'none';
            statusIndicator.className = 'status-indicator';
            inputArea.focus();
        });

        copyBtn.addEventListener('click', () => {
            if (!outputArea.value) return;
            navigator.clipboard.writeText(outputArea.value).then(() => {
                const originalText = copyBtn.textContent;
                copyBtn.textContent = 'Copied!';
                copyBtn.classList.add('copied');
                setTimeout(() => {
                    copyBtn.textContent = originalText;
                    copyBtn.classList.remove('copied');
                }, 2000);
            });
        });

        // Re-format when options change
        indentSelect.addEventListener('change', () => format(false));
        sortKeysCheckbox.addEventListener('change', () => format(false));
    </script>
</body>
</html>