html-tools/csv-to-json.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>CSV to JSON</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; }
        .option-group input[type="text"] { width: 50px; text-align: center; font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; }
        .stats { font-size: 0.85rem; color: var(--text-secondary); margin-left: auto; }
    </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>CSV to JSON</h1>
        <p class="subtitle">Convert CSV data to JSON format</p>
    </header>

    <div class="controls">
        <button id="convertBtn">Convert</button>
        <button id="clearBtn" class="secondary">Clear</button>
        <div class="options">
            <div class="option-group">
                <label for="delimiterInput">Delimiter:</label>
                <input type="text" id="delimiterInput" value="," maxlength="1">
            </div>
            <div class="option-group">
                <input type="checkbox" id="hasHeader" checked>
                <label for="hasHeader">First row is header</label>
            </div>
            <div class="option-group">
                <input type="checkbox" id="trimValues" checked>
                <label for="trimValues">Trim whitespace</label>
            </div>
            <span id="stats" class="stats"></span>
        </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>
                    CSV Input
                    <span id="statusIndicator" class="status-indicator"></span>
                </span>
            </div>
            <textarea id="csvInput" placeholder='Paste your CSV data here...

Example:
name,age,city
John,30,New York
Jane,25,Los Angeles
Bob,35,Chicago' 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>
                    JSON Output
                </span>
                <button id="copyBtn" class="copy-btn">Copy</button>
            </div>
            <textarea id="jsonOutput" readonly placeholder="JSON output will appear here..." spellcheck="false"></textarea>
        </div>
    </div>

    <script>
        const csvInput = document.getElementById('csvInput');
        const jsonOutput = document.getElementById('jsonOutput');
        const delimiterInput = document.getElementById('delimiterInput');
        const hasHeaderCheckbox = document.getElementById('hasHeader');
        const trimValuesCheckbox = document.getElementById('trimValues');
        const convertBtn = document.getElementById('convertBtn');
        const clearBtn = document.getElementById('clearBtn');
        const copyBtn = document.getElementById('copyBtn');
        const errorMessage = document.getElementById('errorMessage');
        const statusIndicator = document.getElementById('statusIndicator');
        const stats = document.getElementById('stats');

        function parseCSV(csv, delimiter, trimValues) {
            const rows = [];
            let currentRow = [];
            let currentField = '';
            let inQuotes = false;

            for (let i = 0; i < csv.length; i++) {
                const char = csv[i];
                const nextChar = csv[i + 1];

                if (inQuotes) {
                    if (char === '"') {
                        if (nextChar === '"') {
                            // Escaped quote
                            currentField += '"';
                            i++;
                        } else {
                            // End of quoted field
                            inQuotes = false;
                        }
                    } else {
                        currentField += char;
                    }
                } else {
                    if (char === '"') {
                        inQuotes = true;
                    } else if (char === delimiter) {
                        currentRow.push(trimValues ? currentField.trim() : currentField);
                        currentField = '';
                    } else if (char === '\n' || (char === '\r' && nextChar === '\n')) {
                        currentRow.push(trimValues ? currentField.trim() : currentField);
                        if (currentRow.length > 0 && currentRow.some(f => f !== '')) {
                            rows.push(currentRow);
                        }
                        currentRow = [];
                        currentField = '';
                        if (char === '\r') i++; // Skip \n in \r\n
                    } else if (char !== '\r') {
                        currentField += char;
                    }
                }
            }

            // Don't forget the last field/row
            currentRow.push(trimValues ? currentField.trim() : currentField);
            if (currentRow.length > 0 && currentRow.some(f => f !== '')) {
                rows.push(currentRow);
            }

            return rows;
        }

        function convert() {
            const csv = csvInput.value;
            const delimiter = delimiterInput.value || ',';
            const hasHeader = hasHeaderCheckbox.checked;
            const trimValues = trimValuesCheckbox.checked;

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

            if (!csv.trim()) {
                jsonOutput.value = '';
                return;
            }

            try {
                const rows = parseCSV(csv, delimiter, trimValues);

                if (rows.length === 0) {
                    jsonOutput.value = '[]';
                    statusIndicator.className = 'status-indicator valid';
                    return;
                }

                let result;
                let rowCount;

                if (hasHeader) {
                    const headers = rows[0];
                    const dataRows = rows.slice(1);
                    rowCount = dataRows.length;

                    result = dataRows.map(row => {
                        const obj = {};
                        headers.forEach((header, i) => {
                            let value = row[i] !== undefined ? row[i] : '';
                            // Try to parse numbers and booleans
                            if (value === 'true') value = true;
                            else if (value === 'false') value = false;
                            else if (value === 'null') value = null;
                            else if (value !== '' && !isNaN(value) && !isNaN(parseFloat(value))) {
                                value = parseFloat(value);
                            }
                            obj[header] = value;
                        });
                        return obj;
                    });
                } else {
                    rowCount = rows.length;
                    result = rows.map(row => {
                        return row.map(value => {
                            if (value === 'true') return true;
                            if (value === 'false') return false;
                            if (value === 'null') return null;
                            if (value !== '' && !isNaN(value) && !isNaN(parseFloat(value))) {
                                return parseFloat(value);
                            }
                            return value;
                        });
                    });
                }

                jsonOutput.value = JSON.stringify(result, null, 2);
                statusIndicator.className = 'status-indicator valid';
                stats.textContent = `${rowCount} rows, ${rows[0]?.length || 0} columns`;

            } catch (e) {
                errorMessage.style.display = 'block';
                errorMessage.textContent = 'Error parsing CSV: ' + e.message;
                jsonOutput.value = '';
                statusIndicator.className = 'status-indicator invalid';
            }
        }

        convertBtn.addEventListener('click', convert);

        // Auto-convert on input
        csvInput.addEventListener('input', convert);
        delimiterInput.addEventListener('input', convert);
        hasHeaderCheckbox.addEventListener('change', convert);
        trimValuesCheckbox.addEventListener('change', convert);

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

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