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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JSON List Editor</title>
<style>
body{font-family:Arial,Helvetica,sans-serif;margin:20px;}
h1{margin-bottom:5px;}
textarea{width:100%;height:120px;font-family:monospace;}
button{margin:5px 0;}
table{border-collapse:collapse;width:100%;margin-top:10px;}
th,td{border:1px solid #aaa;padding:4px 6px;text-align:left;}
th{background:#f0f0f0;}
input[type=text]{width:100%;box-sizing:border-box;}
.hidden{display:none;}
.del-btn{background:#e74c3c;color:white;border:none;padding:4px 6px;cursor:pointer;}
</style>
</head>
<body>
<h1>JSON List Editor</h1>
<p>Paste or load a JSON array of objects below and click <strong>Load</strong>.</p>
<textarea id="jsonInput" placeholder='[{"id":1,"name":"Alice","age":30},{"id":2,"name":"Bob","_secret":"xyz"}]'></textarea><br>
<button id="loadBtn">Load</button>
<button id="addBtn">New card</button>
<button id="saveBtn">Download JSON</button>
<input type="file" id="fileInput" accept=".json" style="display:none;">
<div id="tableContainer"></div>
<script>
/* --------------- Global State --------------- */
let data = []; // array of objects
let fieldKeys = []; // columns that will be shown (no leading "_")
/* --------------- Load & Parse JSON --------------- */
function loadJSON(text) {
try {
const parsed = JSON.parse(text);
if (!Array.isArray(parsed)) throw new Error('JSON must be an array of objects');
data = parsed.map(obj => ({...obj})); // clone to avoid accidental mutations
computeFieldKeys();
renderTable();
} catch (e) {
alert('Error parsing JSON: ' + e.message);
}
}
function computeFieldKeys() {
const keys = new Set();
data.forEach(obj => {
Object.keys(obj).forEach(k => {
if (!k.startsWith('_')) keys.add(k);
});
});
fieldKeys = Array.from(keys);
}
/* --------------- Render Table --------------- */
function renderTable() {
const container = document.getElementById('tableContainer');
container.innerHTML = ''; // clear previous
if (!data.length) return;
const table = document.createElement('table');
const thead = document.createElement('thead');
const headerRow = document.createElement('tr');
// Build header
fieldKeys.forEach(k => {
const th = document.createElement('th');
th.textContent = k;
headerRow.appendChild(th);
});
thead.appendChild(headerRow);
table.appendChild(thead);
// Extra header for Delete button
const delTh = document.createElement('th');
delTh.textContent = 'Delete';
headerRow.appendChild(delTh);
// Build body
const tbody = document.createElement('tbody');
data.forEach((obj, rowIndex) => {
const tr = document.createElement('tr');
fieldKeys.forEach(k => {
const td = document.createElement('td');
const input = document.createElement('textarea');
input.rows = 2;
// const input = document.createElement('input');
// input.type = 'text';
input.value = obj[k] !== undefined ? obj[k] : '';
input.dataset.row = rowIndex;
input.dataset.key = k;
input.addEventListener('input', onFieldChange);
td.appendChild(input);
tr.appendChild(td);
});
tbody.appendChild(tr);
// Delete button column
const delTd = document.createElement('td');
const delBtn = document.createElement('button');
delBtn.textContent = 'x';
delBtn.className = 'del-btn';
delBtn.dataset.row = rowIndex;
delBtn.addEventListener('click', () => onDeleteRow(rowIndex));
delTd.appendChild(delBtn);
tr.appendChild(delTd);
});
table.appendChild(tbody);
container.appendChild(table);
}
function onFieldChange(e) {
const row = e.target.dataset.row;
const key = e.target.dataset.key;
const value = e.target.value;
data[row][key] = value;
}
/**
* Remove all keys from an object whose value is the empty string.
*
* @param {Object} obj - The source object to clean.
* @param {boolean} [inPlace=false] - If true the original object is mutated.
* @returns {Object} A new object (or the original if inPlace is true) without empty‑string values.
*
* @example
* const data = { a: 'foo', b: '', c: 'bar', d: '' };
* const cleaned = removeEmptyStrings(data);
* // cleaned === { a: 'foo', c: 'bar' }
*/
function removeEmptyStrings(obj, inPlace = false) {
if (typeof obj !== 'object' || obj === null) {
throw new TypeError('Expected an object');
}
// If we’re mutating, work directly on the original
const target = inPlace ? obj : {};
for (const key in obj) {
if (!Object.prototype.hasOwnProperty.call(obj, key)) continue;
const value = obj[key];
if (value === '') {
if (!inPlace) continue; // skip adding it to the new object
delete target[key]; // remove from the original
} else {
target[key] = value; // copy non‑empty value
}
}
return target;
}
function onDeleteRow(idx) {
data.splice(idx, 1);
renderTable();
}
/* --------------- File I/O --------------- */
document.getElementById('loadBtn').addEventListener('click', () => {
const text = document.getElementById('jsonInput').value;
loadJSON(text);
});
document.getElementById('saveBtn').addEventListener('click', () => {
if (!data.length) return;
data.forEach(removeEmptyStrings);
const blob = new Blob([JSON.stringify(data, null, 2)], {type: 'application/json'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'edited.json';
a.click();
URL.revokeObjectURL(url);
});
/* --------------- Optional: Drag‑and‑Drop or File Input --------------- */
document.getElementById('fileInput').addEventListener('change', evt => {
const file = evt.target.files[0];
if (!file) return;
const reader = new FileReader();
reader.onload = e => loadJSON(e.target.result);
reader.readAsText(file);
});
/* --------------- Optional: Load file via button --------------- */
const fileBtn = document.createElement('button');
fileBtn.textContent = 'Load from File';
fileBtn.addEventListener('click', () => document.getElementById('fileInput').click());
document.body.insertBefore(fileBtn, document.getElementById('tableContainer'));
/* --------------- Add New Object --------------- */
document.getElementById('addBtn').addEventListener('click', () => {
if (!fieldKeys.length) {
alert('Load a JSON file first, then you can add a new object.');
return;
}
const newObj = {};
fieldKeys.forEach(k => newObj[k] = '');
newObj.id = crypto.randomUUID();
data.push(newObj);
renderTable();
});
</script>
</body>
</html>
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