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<!DOCTYPE html>
<html lang="en">
<head>
<include src="_partials/meta-base.html"></include>
<title>JSON Diff β HTML Tools</title>
<meta name="description" content="Compare two JSON objects and instantly see what was added, removed, or changed. Runs in your browser β no installs, no servers, no tracking.">
<link rel="canonical" href="https://tools.mazipan.space/json-diff">
<meta property="og:title" content="JSON Diff β HTML Tools">
<meta property="og:description" content="Compare two JSON objects and instantly see what was added, removed, or changed. Runs in your browser β no installs, no servers, no tracking.">
<meta property="og:url" content="https://tools.mazipan.space/json-diff">
<meta name="twitter:title" content="JSON Diff β HTML Tools">
<meta name="twitter:description" content="Compare two JSON objects and instantly see what was added, removed, or changed. Runs in your browser β no installs, no servers, no tracking.">
<include src="_partials/meta-social.html"></include>
<link rel="icon" type="image/png" sizes="32x32" href="favicon-json-diff.png">
<include src="_partials/head-fonts.html"></include>
<link rel="stylesheet" href="styles.css">
<style>
.diff-added { background: rgba(63,185,80,.12); border-left: 3px solid #3fb950; }
.diff-removed { background: rgba(248,81,73,.12); border-left: 3px solid #f85149; }
.diff-changed { background: rgba(210,153,34,.12); border-left: 3px solid #d2991e; }
.badge-added { background: rgba(63,185,80,.15); color: #3fb950; }
.badge-removed { background: rgba(248,81,73,.15); color: #f85149; }
.badge-changed { background: rgba(210,153,34,.15); color: #d2991e; }
.val-old { color: #f85149; text-decoration: line-through; opacity: .8; }
.val-new { color: #3fb950; }
.val-add { color: #3fb950; }
.val-rem { color: #f85149; }
.diff-path { color: #c792ea; font-family: 'SFMono-Regular', Consolas, monospace; font-size: 0.78rem; }
/* Tree highlight rows */
.tree-hl-added { background: rgba(63,185,80,.15); border-radius: 3px; }
.tree-hl-removed { background: rgba(248,81,73,.15); border-radius: 3px; }
.tree-hl-changed { background: rgba(210,153,34,.15); border-radius: 3px; }
.tree-hl-parent { border-left: 2px solid rgba(255,255,255,.1); margin-left: 1px; }
mark.sh { background: #92400e; color: #fef3c7; border-radius: 2px; padding: 0 1px; }
mark.sh.sh-active { background: #f59e0b; color: #000; border-radius: 2px; padding: 0 1px; }
#search-input:-webkit-autofill,
#search-input:autofill {
-webkit-box-shadow: 0 0 0 1000px #111827 inset;
box-shadow: 0 0 0 1000px #111827 inset;
-webkit-text-fill-color: #e5e7eb;
caret-color: #e5e7eb;
}
</style>
<include src="_partials/head-theme.html"></include>
<!-- BEGIN:json-ld generated by scripts/generate-sections.mjs β re-run after editing tools.json -->
<script type="application/ld+json">{"@context":"https://schema.org","@type":"WebApplication","name":"JSON Diff","url":"https://tools.mazipan.space/json-diff","description":"Compare two JSON objects and instantly see what was added, removed, or changed. Runs in your browser β no installs, no servers, no tracking.","applicationCategory":"DeveloperApplication","operatingSystem":"Any","browserRequirements":"Requires JavaScript","offers":{"@type":"Offer","price":"0","priceCurrency":"USD"},"isPartOf":{"@type":"WebSite","name":"HTML Tools","url":"https://tools.mazipan.space/"}}</script>
<script type="application/ld+json">{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"HTML Tools","item":"https://tools.mazipan.space/"},{"@type":"ListItem","position":2,"name":"JSON Diff","item":"https://tools.mazipan.space/json-diff"}]}</script>
<script type="application/ld+json">{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Will whitespace or key-order differences show up?","acceptedAnswer":{"@type":"Answer","text":"No. Both inputs are normalized before diffing, so only real structural differences are highlighted."}},{"@type":"Question","name":"How are arrays compared?","acceptedAnswer":{"@type":"Answer","text":"By index. Reordering an array shows up as a removal-then-addition pair. Use JSON Sort first if you want order-insensitive comparison."}},{"@type":"Question","name":"Can it handle large JSON files?","acceptedAnswer":{"@type":"Answer","text":"Anything that fits comfortably in your browser memory. There's no hard limit; the diff updates as you type."}},{"@type":"Question","name":"Are there really no servers involved?","acceptedAnswer":{"@type":"Answer","text":"Right. The page is a single static HTML file; the comparison happens entirely in your browser."}}]}</script>
<!-- END:json-ld -->
</head>
<body class="bg-gray-950 text-gray-200 min-h-screen flex flex-col">
<include src="_partials/icons.html"></include>
<header class="border-b border-gray-800 px-6 py-4">
<nav aria-label="Breadcrumb" class="max-w-[1100px] mx-auto flex items-center gap-3">
<a href="index.html" class="no-underline text-white font-bold text-lg tracking-tight hover:text-blue-400 transition-colors">
HTML Tools
</a>
<span class="text-gray-700">/</span>
<span class="text-gray-400 text-sm" aria-current="page">π JSON Diff</span>
</nav>
</header>
<main class="max-w-[1100px] mx-auto w-full flex-1 py-8 px-6">
<header class="mb-7">
<h1 class="text-3xl font-bold text-white flex items-center gap-3">π JSON Diff</h1>
<p class="mt-1.5 text-sm text-gray-500">Paste two JSON objects then compare and inspect differences.</p>
</header>
<!-- Inputs -->
<div class="grid grid-cols-2 gap-4 mb-4 max-md:grid-cols-1">
<div>
<div class="flex items-center justify-between mb-2">
<label class="text-xs font-semibold text-gray-500 uppercase tracking-wide">Original</label>
<span id="err-left" class="text-xs text-red-400"></span>
</div>
<textarea id="left" placeholder="Paste original JSON here..." spellcheck="false"
class="w-full h-64 rounded-lg border border-gray-700 bg-gray-900 text-gray-200
font-mono text-[0.8rem] leading-relaxed p-4 resize-y outline-none
focus:border-blue-400 transition-colors"></textarea>
</div>
<div>
<div class="flex items-center justify-between mb-2">
<label class="text-xs font-semibold text-gray-500 uppercase tracking-wide">Modified</label>
<span id="err-right" class="text-xs text-red-400"></span>
</div>
<textarea id="right" placeholder="Paste modified JSON here..." spellcheck="false"
class="w-full h-64 rounded-lg border border-gray-700 bg-gray-900 text-gray-200
font-mono text-[0.8rem] leading-relaxed p-4 resize-y outline-none
focus:border-blue-400 transition-colors"></textarea>
</div>
</div>
<!-- Actions -->
<div class="flex flex-col gap-3 mb-6">
<label class="flex items-center gap-2 cursor-pointer select-none text-sm text-gray-400 hover:text-gray-200 transition-colors w-fit">
<input type="checkbox" id="show-tree"
class="w-4 h-4 rounded border-gray-600 bg-gray-800 accent-blue-400 cursor-pointer">
Reformat & show tree
</label>
<div class="flex items-center gap-2">
<button onclick="runCompare()" class="btn btn-primary">π Compare</button>
<button onclick="runReset()" class="btn btn-danger">β©οΈ Reset</button>
<button onclick="openSearch()" title="Search results (Ctrl+F / βF)" class="btn btn-secondary">π Search</button>
</div>
<!-- Search bar -->
<div id="search-bar" style="display:none"
class="flex items-center gap-1.5 px-2 py-1.5 rounded-lg border border-gray-700 bg-gray-900/70 w-full max-w-lg">
<input id="search-input" type="text" placeholder="Search in resultsβ¦" spellcheck="false" autocomplete="off"
oninput="runSearch()"
onkeydown="onSearchKey(event)"
class="flex-1 bg-transparent text-gray-200 font-mono text-[0.78rem] outline-none placeholder-gray-600 min-w-0">
<span id="search-count" class="text-[0.7rem] text-gray-500 whitespace-nowrap select-none"></span>
<button onclick="navigateSearch(-1)" title="Previous (Shift+Enter)" class="btn-icon btn-icon-sm ghost"><svg class="icon" aria-hidden="true"><use href="#icon-arrow-up"/></svg></button>
<button onclick="navigateSearch(1)" title="Next (Enter)" class="btn-icon btn-icon-sm ghost"><svg class="icon" aria-hidden="true"><use href="#icon-arrow-down"/></svg></button>
<button onclick="closeSearch()" title="Close (Esc)" class="btn-icon btn-icon-sm danger"><svg class="icon" aria-hidden="true"><use href="#icon-x"/></svg></button>
</div>
</div>
<!-- Diff result -->
<div id="diff-section" style="display:none" class="mb-6"></div>
<!-- Tree section -->
<div id="tree-section" style="display:none">
<div class="flex items-center gap-4 flex-wrap mb-3">
<span class="text-xs text-gray-500 font-medium uppercase tracking-wide">Legend</span>
<span class="flex items-center gap-1.5 text-xs text-gray-400">
<span class="inline-block w-3 h-3 rounded-sm" style="background:rgba(63,185,80,.4); border-left: 3px solid #3fb950"></span>
Added
</span>
<span class="flex items-center gap-1.5 text-xs text-gray-400">
<span class="inline-block w-3 h-3 rounded-sm" style="background:rgba(248,81,73,.4); border-left: 3px solid #f85149"></span>
Removed
</span>
<span class="flex items-center gap-1.5 text-xs text-gray-400">
<span class="inline-block w-3 h-3 rounded-sm" style="background:rgba(210,153,34,.4); border-left: 3px solid #d2991e"></span>
Changed
</span>
<span class="flex items-center gap-1.5 text-xs text-gray-400">
<span class="inline-block w-3 h-3 rounded-sm border-l-2 border-white/10 bg-transparent"></span>
Has changes inside
</span>
<label class="flex items-center gap-1.5 text-xs text-gray-400 hover:text-gray-200 cursor-pointer select-none ml-auto">
<input type="checkbox" id="lock-scroll" checked
class="w-3.5 h-3.5 accent-blue-400 cursor-pointer">
Lock scroll
</label>
</div>
<div class="grid grid-cols-2 gap-4 max-md:grid-cols-1">
<div>
<label class="text-xs font-semibold text-gray-500 uppercase tracking-wide block mb-2">Original β Tree</label>
<div id="left-tree"
class="w-full h-96 rounded-lg border border-gray-700 bg-gray-900
font-mono text-[0.8rem] leading-relaxed p-4 overflow-auto resize-y"></div>
</div>
<div>
<label class="text-xs font-semibold text-gray-500 uppercase tracking-wide block mb-2">Modified β Tree</label>
<div id="right-tree"
class="w-full h-96 rounded-lg border border-gray-700 bg-gray-900
font-mono text-[0.8rem] leading-relaxed p-4 overflow-auto resize-y"></div>
</div>
</div>
</div>
</main>
<section class="max-w-[1100px] mx-auto w-full px-6 py-8 border-t border-gray-800">
<div class="grid gap-6 md:grid-cols-2">
<div>
<h2 class="text-xl font-bold text-white mb-4">About JSON Diff</h2>
<p class="text-gray-400 leading-relaxed">Paste two JSON objects to instantly see what was added, removed, or changed. Differences are color-coded inline so you can scan at a glance β green for additions, red for removals, amber for modifications.</p>
</div>
<div>
<h2 class="text-xl font-bold text-white mb-4">How to use</h2>
<ol class="text-gray-400 leading-relaxed space-y-2 list-decimal list-inside">
<li>Paste the original JSON in the left panel.</li>
<li>Paste the updated version in the right panel.</li>
<li>Review the inline diff; toggle <strong class="text-gray-300">show unchanged</strong> if you want surrounding context.</li>
<li>Use the badges in the header to jump between change types.</li>
</ol>
</div>
<div>
<h2 class="text-xl font-bold text-white mb-4">Common use cases</h2>
<ul class="text-gray-400 leading-relaxed space-y-2 list-disc list-inside">
<li>Comparing API responses before and after a code change.</li>
<li>Reviewing what changed in a configuration file across environments.</li>
<li>Verifying that a serialization round-trip preserved every field.</li>
<li>Catching unintended additions or removals during a refactor.</li>
</ul>
</div>
<div>
<h2 class="text-xl font-bold text-white mb-4">Tips</h2>
<ul class="text-gray-400 leading-relaxed space-y-2 list-disc list-inside">
<li>Whitespace and key-order differences never show up β inputs are normalized before diffing.</li>
<li>Arrays diff by index, so a reorder shows as a removal-then-addition pair.</li>
<li>The diff updates as you type; no button to click.</li>
</ul>
</div>
</div>
</section>
<!-- BEGIN:faq generated by scripts/generate-sections.mjs β re-run after editing tools.json -->
<section class="max-w-[1100px] mx-auto w-full px-6 py-8 border-t border-gray-800">
<h2 class="text-xl font-bold text-white mb-6">FAQ</h2>
<div class="space-y-2">
<details class="disclosure">
<summary>Will whitespace or key-order differences show up?</summary>
<div class="disclosure-content"><div class="disclosure-body">No. Both inputs are normalized before diffing, so only real structural differences are highlighted.</div></div>
</details>
<details class="disclosure">
<summary>How are arrays compared?</summary>
<div class="disclosure-content"><div class="disclosure-body">By index. Reordering an array shows up as a removal-then-addition pair. Use JSON Sort first if you want order-insensitive comparison.</div></div>
</details>
<details class="disclosure">
<summary>Can it handle large JSON files?</summary>
<div class="disclosure-content"><div class="disclosure-body">Anything that fits comfortably in your browser memory. There's no hard limit; the diff updates as you type.</div></div>
</details>
<details class="disclosure">
<summary>Are there really no servers involved?</summary>
<div class="disclosure-content"><div class="disclosure-body">Right. The page is a single static HTML file; the comparison happens entirely in your browser.</div></div>
</details>
</div>
</section>
<!-- END:faq -->
<!-- BEGIN:more-tools generated by scripts/generate-sections.mjs β re-run after editing tools.json -->
<section class="max-w-[1100px] mx-auto w-full px-6 py-8 border-t border-gray-800">
<h2 class="text-xl font-bold text-white mb-6">More tools</h2>
<div class="space-y-4">
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">JSON</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/json-formatter" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">ποΈ JSON Formatter</a>
<a href="/json-to-ts" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π· JSON to TypeScript</a>
<a href="/json-sort" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π€ JSON Sort</a>
<a href="/csv-to-json" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π JSON β CSV</a>
<a href="/json-to-yaml" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π JSON β YAML</a>
<a href="/json-to-schema" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π‘οΈ JSON to Validator Schema</a>
</div>
</div>
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">Code</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/regex-tester" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π§ͺ Regex Tester</a>
<a href="/svg-to-jsx" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">βοΈ SVG to JSX</a>
<a href="/svg-rasterizer" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π· SVG to Raster</a>
<a href="/cron-decoder" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">β±οΈ Cron Decoder</a>
<a href="/snippet-to-image" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">πΈ Code Snippet to Image</a>
<a href="/text-diff" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π Text Diff</a>
<a href="/markdown-preview" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π Markdown Preview</a>
<a href="/semver-checker" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π·οΈ SemVer Checker</a>
<a href="/jwt-decoder" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π JWT Decoder</a>
</div>
</div>
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">Ornaments</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/gradients" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π¨ Gradients</a>
<a href="/blob" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">𫧠Blob Generator</a>
<a href="/waves" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">γ°οΈ Wave Generator</a>
</div>
</div>
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">Image</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/image-compressor" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">ποΈ Image Compressor</a>
<a href="/image-resizer" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π Image Resizer</a>
<a href="/image-cropper" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">βοΈ Image Cropper</a>
<a href="/image-converter" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">πΌοΈ Image Format Converter</a>
<a href="/image-watermark" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π Image Watermark</a>
</div>
</div>
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">Audio</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/mp3-tag-editor" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π΅ MP3 Tag Editor</a>
</div>
</div>
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">Web / SEO</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/meta-tag-preview" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π Meta Tag Preview</a>
<a href="/user-agent-parser" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π΅οΈ User Agent Parser</a>
<a href="/og-image-builder" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">πΌοΈ OG Image Builder</a>
</div>
</div>
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">Generators</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/qr-code-generator" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π± QR Code Generator</a>
<a href="/lorem-ipsum" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π Lorem Ipsum Generator</a>
<a href="/avatar-generator" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π€ Avatar Generator</a>
<a href="/favicon-generator" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">β Favicon Generator</a>
<a href="/uuid-generator" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">πͺͺ UUID Generator</a>
<a href="/wheel-of-names" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π‘ Wheel of Names</a>
</div>
</div>
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">PDF</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/pdf-merger" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π PDF Merger</a>
<a href="/image-to-pdf" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π Image to PDF</a>
<a href="/pdf-compressor" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π€ PDF Compressor</a>
<a href="/pdf-splitter" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">βοΈ PDF Splitter</a>
<a href="/pdf-page-manager" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">ποΈ PDF Page Manager</a>
<a href="/pdf-watermark" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π§ PDF Watermark</a>
<a href="/pdf-signature" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">βοΈ PDF Signature</a>
<a href="/pdf-to-image" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">πΌοΈ PDF to Image</a>
</div>
</div>
<div>
<h3 class="text-xs font-semibold uppercase tracking-wider text-gray-500 mb-2">Time</h3>
<div class="flex flex-wrap gap-x-5 gap-y-2">
<a href="/pomodoro-timer" class="text-sm text-gray-300 hover:text-blue-400 transition-colors no-underline">π
Pomodoro Timer</a>
</div>
</div>
</div>
</section>
<!-- END:more-tools -->
<footer class="max-w-[1100px] mx-auto w-full py-8 px-6 border-t border-gray-800 text-center text-sm text-gray-600">
<div>© <span id="year"></span> <a href="https://mazipan.space" rel="noreferrer noopener" target="_blank" class="text-blue-400 transition-colors">Irfan Maulana</a> & Claude</div>
<div><span id="deploy-time"></span></div>
<div><span id="commit-sha"></span><a href="https://github.com/mazipan/html-tools" rel="noreferrer noopener" target="_blank" class="text-blue-400 transition-colors">Source</a></div>
<div><a href="design-system.html" rel="nofollow" class="text-blue-400 transition-colors">Design system</a></div>
<div><a href="https://baca-quran.id" rel="noreferrer noopener" target="_blank" class="text-blue-400 transition-colors">Baca Quran</a> Β· <a href="https://games.mazipan.space" rel="noreferrer noopener" target="_blank" class="text-blue-400 transition-colors">Games</a></div>
</footer>
<script src="json-utils.js"></script>
<include src="_partials/footer-script.html"></include>
<script>
const leftEl = document.getElementById('left');
const rightEl = document.getElementById('right');
const errLeft = document.getElementById('err-left');
const errRight = document.getElementById('err-right');
const treeSection = document.getElementById('tree-section');
const diffSection = document.getElementById('diff-section');
const leftTreeEl = document.getElementById('left-tree');
const rightTreeEl = document.getElementById('right-tree');
const showTreeCb = document.getElementById('show-tree');
let lastChanges = null;
let isSyncing = false;
function setupScrollSync() {
function sync(source, target) {
source.addEventListener('scroll', () => {
if (!document.getElementById('lock-scroll').checked || isSyncing) return;
isSyncing = true;
target.scrollTop = source.scrollTop;
target.scrollLeft = source.scrollLeft;
requestAnimationFrame(() => { isSyncing = false; });
});
}
sync(leftTreeEl, rightTreeEl);
sync(rightTreeEl, leftTreeEl);
}
setupScrollSync();
// ββ Helpers βββββββββββββββββββββββββββββββββββββββββββββββββββ
function escHtml(s) {
return String(s).replace(/&/g,'&').replace(/</g,'<').replace(/>/g,'>').replace(/"/g,'"').replace(/'/g,''');
}
function clearErrors() {
errLeft.textContent = '';
errRight.textContent = '';
leftEl.classList.remove('border-red-500');
rightEl.classList.remove('border-red-500');
}
function parseBoth() {
clearErrors();
let left, right, ok = true;
try { ({ value: left } = tolerantParse(leftEl.value.trim())); }
catch(e) { errLeft.textContent = e.message; leftEl.classList.add('border-red-500'); ok = false; }
try { ({ value: right } = tolerantParse(rightEl.value.trim())); }
catch(e) { errRight.textContent = e.message; rightEl.classList.add('border-red-500'); ok = false; }
return ok ? { left, right } : null;
}
// ββ Actions βββββββββββββββββββββββββββββββββββββββββββββββββββ
function runCompare() {
const data = parseBoth();
if (!data) return;
lastChanges = computeDiff(data.left, data.right);
const added = lastChanges.filter(c => c.type === 'added').length;
const removed = lastChanges.filter(c => c.type === 'removed').length;
const changed = lastChanges.filter(c => c.type === 'changed').length;
diffSection.style.display = '';
diffSection.innerHTML = renderSummary(added, removed, changed) + renderChanges(lastChanges);
if (showTreeCb.checked) {
refreshTrees(data);
} else {
treeSection.style.display = 'none';
}
}
function refreshTrees(data) {
// Reformat textareas
leftEl.value = JSON.stringify(data.left, null, 2);
rightEl.value = JSON.stringify(data.right, null, 2);
// Build per-side highlight maps from last diff
const leftHL = new Map();
const rightHL = new Map();
if (lastChanges) {
for (const c of lastChanges) {
if (c.type === 'removed' || c.type === 'changed') leftHL.set(c.path, c.type);
if (c.type === 'added' || c.type === 'changed') rightHL.set(c.path, c.type);
}
}
treeSection.style.display = '';
renderTreeInto(leftTreeEl, data.left, leftHL);
renderTreeInto(rightTreeEl, data.right, rightHL);
leftTreeEl.scrollTop = 0;
rightTreeEl.scrollTop = 0;
}
function runReset() {
leftEl.value = '';
rightEl.value = '';
clearErrors();
lastChanges = null;
showTreeCb.checked = false;
treeSection.style.display = 'none';
diffSection.style.display = 'none';
diffSection.innerHTML = '';
leftTreeEl.innerHTML = '';
rightTreeEl.innerHTML = '';
closeSearch();
leftEl.focus();
}
// ββ Tree renderer βββββββββββββββββββββββββββββββββββββββββββββ
function renderTreeInto(container, value, highlights) {
container.innerHTML = '';
const root = document.createElement('div');
root.className = 'tree-root';
const counter = { n: 1 };
root.appendChild(buildTree(value, null, true, false, '', highlights, counter));
container.appendChild(root);
}
function childPath(parentPath, key, isArrayItem) {
if (key === null) return parentPath;
if (isArrayItem) return parentPath ? `${parentPath}[${key}]` : `[${key}]`;
return parentPath ? `${parentPath}.${key}` : String(key);
}
function hasDescendant(path, highlights) {
if (!highlights.size) return false;
const prefix = path ? path + '.' : '';
const prefixArr = path ? path + '[' : '[';
for (const [p] of highlights) {
if (p.startsWith(prefix) || p.startsWith(prefixArr)) return true;
}
return false;
}
function buildTree(value, key, isLast, isArrayItem, parentPath, highlights, counter) {
const curPath = childPath(parentPath, key, isArrayItem);
const hlType = highlights?.get(curPath);
const hasDesc = !hlType && highlights?.size && hasDescendant(curPath, highlights);
const node = document.createElement('div');
node.className = 'tree-node';
if (value === null || typeof value !== 'object') {
const row = document.createElement('div');
row.className = 'tree-row' + (hlType ? ` tree-hl-${hlType}` : '');
row.dataset.path = curPath;
row.innerHTML =
`<span class="line-num">${counter.n++}</span>` +
'<span class="toggle-btn leaf">βΆ</span>' +
(key !== null && !isArrayItem ? `<span class="json-key">"${escHtml(String(key))}"</span><span class="json-punct">: </span>` : '') +
primitiveHtml(value) +
(isLast ? '' : '<span class="tree-comma">,</span>');
node.appendChild(row);
return node;
}
const isArray = Array.isArray(value);
const keys = isArray ? value.map((_, i) => i) : Object.keys(value);
const openB = isArray ? '[' : '{';
const closeB = isArray ? ']' : '}';
const preview = `${keys.length} ${isArray ? 'item' : 'key'}${keys.length !== 1 ? 's' : ''}`;
const headerRow = document.createElement('div');
headerRow.className = 'tree-row' + (hlType ? ` tree-hl-${hlType}` : hasDesc ? ' tree-hl-parent' : '');
headerRow.dataset.path = curPath;
headerRow.style.cursor = 'pointer';
const toggleBtn = document.createElement('span');
toggleBtn.className = 'toggle-btn';
toggleBtn.textContent = 'βΌ';
const keyHtml = key !== null && !isArrayItem
? `<span class="json-key">"${escHtml(String(key))}"</span><span class="json-punct">: </span>`
: '';
headerRow.innerHTML =
`<span class="line-num">${counter.n++}</span>` +
keyHtml +
`<span class="json-punct">${openB}</span>` +
`<span class="collapsed-preview" style="display:none"> ${preview} </span>`;
headerRow.insertBefore(toggleBtn, headerRow.children[1]);
node.appendChild(headerRow);
const childrenEl = document.createElement('div');
childrenEl.className = 'tree-children';
keys.forEach((k, i) => {
childrenEl.appendChild(
buildTree(value[k], k, i === keys.length - 1, isArray, curPath, highlights, counter)
);
});
node.appendChild(childrenEl);
const footerRow = document.createElement('div');
footerRow.className = 'tree-row';
footerRow.innerHTML =
`<span class="line-num">${counter.n++}</span>` +
'<span class="toggle-btn leaf">βΆ</span>' +
`<span class="json-punct">${closeB}</span>` +
(isLast ? '' : '<span class="tree-comma">,</span>');
node.appendChild(footerRow);
const collapsedPreview = headerRow.querySelector('.collapsed-preview');
let collapsed = false;
toggleBtn.addEventListener('click', e => {
e.stopPropagation();
collapsed = !collapsed;
toggleBtn.textContent = collapsed ? 'βΆ' : 'βΌ';
childrenEl.style.display = collapsed ? 'none' : '';
footerRow.style.display = collapsed ? 'none' : '';
collapsedPreview.style.display = collapsed ? 'inline' : 'none';
if (collapsed) collapsedPreview.textContent = ` ${preview} ${closeB}${isLast ? '' : ','}`;
});
headerRow.addEventListener('click', () => toggleBtn.click());
return node;
}
function primitiveHtml(v) {
if (v === null) return `<span class="json-null">null</span>`;
if (typeof v === 'boolean') return `<span class="json-bool">${v}</span>`;
if (typeof v === 'number') return `<span class="json-number">${v}</span>`;
return `<span class="json-string">"${escHtml(v)}"</span>`;
}
// ββ Diff algorithm βββββββββββββββββββββββββββββββββββββββββββββ
function computeDiff(a, b, path = '') {
if (a === b) return [];
const typeA = Array.isArray(a) ? 'array' : (a === null ? 'null' : typeof a);
const typeB = Array.isArray(b) ? 'array' : (b === null ? 'null' : typeof b);
if (typeA !== typeB || (typeA !== 'object' && typeA !== 'array')) {
return [{ type: 'changed', path, oldVal: a, newVal: b }];
}
const changes = [];
if (typeA === 'array') {
const len = Math.max(a.length, b.length);
for (let i = 0; i < len; i++) {
const p = `${path}[${i}]`;
if (i >= a.length) changes.push({ type: 'added', path: p, newVal: b[i] });
else if (i >= b.length) changes.push({ type: 'removed', path: p, oldVal: a[i] });
else changes.push(...computeDiff(a[i], b[i], p));
}
} else {
for (const key of new Set([...Object.keys(a), ...Object.keys(b)])) {
const p = path ? `${path}.${key}` : key;
if (!(key in a)) changes.push({ type: 'added', path: p, newVal: b[key] });
else if (!(key in b)) changes.push({ type: 'removed', path: p, oldVal: a[key] });
else changes.push(...computeDiff(a[key], b[key], p));
}
}
return changes;
}
// ββ Diff rendering βββββββββββββββββββββββββββββββββββββββββββββ
function shortVal(v) {
if (v === null) return 'null';
if (typeof v !== 'object') return JSON.stringify(v);
const s = JSON.stringify(v);
return s.length > 60 ? s.slice(0, 57) + 'β¦' : s;
}
function renderSummary(added, removed, changed) {
if (added + removed + changed === 0) {
return `<div class="flex items-center gap-2 text-green-400 text-sm font-medium py-4">
<span class="text-lg">β</span> Both JSON objects are identical.
</div>`;
}
return `
<div class="grid grid-cols-3 gap-3 mb-4 max-sm:grid-cols-1">
<div class="badge-added rounded-lg px-4 py-3 flex items-center gap-3">
<span class="text-2xl font-bold">${added}</span>
<div>
<div class="text-xs font-semibold uppercase tracking-wide opacity-70">Added</div>
<div class="text-xs opacity-60">new ${added === 1 ? 'field' : 'fields'}</div>
</div>
</div>
<div class="badge-removed rounded-lg px-4 py-3 flex items-center gap-3">
<span class="text-2xl font-bold">${removed}</span>
<div>
<div class="text-xs font-semibold uppercase tracking-wide opacity-70">Removed</div>
<div class="text-xs opacity-60">deleted ${removed === 1 ? 'field' : 'fields'}</div>
</div>
</div>
<div class="badge-changed rounded-lg px-4 py-3 flex items-center gap-3">
<span class="text-2xl font-bold">${changed}</span>
<div>
<div class="text-xs font-semibold uppercase tracking-wide opacity-70">Changed</div>
<div class="text-xs opacity-60">modified ${changed === 1 ? 'value' : 'values'}</div>
</div>
</div>
</div>`;
}
function renderChanges(changes) {
if (!changes.length) return '';
return `<div class="flex flex-col gap-1">${changes.map(c => {
let valueHtml;
if (c.type === 'added') {
valueHtml = `<span class="val-add">${escHtml(shortVal(c.newVal))}</span>`;
} else if (c.type === 'removed') {
valueHtml = `<span class="val-rem">${escHtml(shortVal(c.oldVal))}</span>`;
} else {
valueHtml = `<span class="val-old">${escHtml(shortVal(c.oldVal))}</span>
<span class="text-gray-600 mx-1">β</span>
<span class="val-new">${escHtml(shortVal(c.newVal))}</span>`;
}
const icon = c.type === 'added' ? '+' : c.type === 'removed' ? 'β' : 'β ';
const iconColor = c.type === 'added' ? 'text-green-400' : c.type === 'removed' ? 'text-red-400' : 'text-yellow-500';
return `
<div class="diff-${c.type} rounded px-3 py-2 flex items-baseline gap-3 flex-wrap cursor-pointer hover:brightness-125 transition-all"
data-diff-path="${escHtml(c.path || '')}" onclick="scrollToPath(this.dataset.diffPath)" title="Click to scroll to this path in the tree">
<span class="w-5 text-center font-bold font-mono text-xs ${iconColor}">${icon}</span>
<span class="diff-path">${escHtml(c.path || '(root)')}</span>
<span class="text-gray-600 text-xs">${c.type}</span>
<span class="ml-auto font-mono text-xs text-right">${valueHtml}</span>
</div>`;
}).join('')}</div>`;
}
// ββ Scroll to path βββββββββββββββββββββββββββββββββββββββββββ
function isAncestorPath(ancestor, target) {
return target === ancestor || target.startsWith(ancestor + '.') || target.startsWith(ancestor + '[');
}
function scrollToPath(path) {
if (treeSection.style.display === 'none') return;
// Expand only ancestors of the target path, leaving everything else as-is
[leftTreeEl, rightTreeEl].forEach(container => {
container.querySelectorAll('.toggle-btn:not(.leaf)').forEach(btn => {
if (btn.textContent !== 'βΆ') return;
const row = btn.closest('[data-path]');
if (row && isAncestorPath(row.dataset.path, path)) btn.click();
});
});
[leftTreeEl, rightTreeEl].forEach(container => {
const rows = container.querySelectorAll('[data-path]');
const row = Array.from(rows).find(r => r.dataset.path === path);
if (!row) return;
row.scrollIntoView({ block: 'center', behavior: 'smooth' });
row.style.outline = '2px solid #f59e0b';
row.style.borderRadius = '3px';
setTimeout(() => { row.style.outline = ''; row.style.borderRadius = ''; }, 1200);
});
}
// ββ Search βββββββββββββββββββββββββββββββββββββββββββββββββββ
let searchMatches = [];
let searchCurrent = -1;
let searchCollapsedSnapshot = null;
function captureCollapsed() {
const snap = { left: new Set(), right: new Set() };
[[leftTreeEl, 'left'], [rightTreeEl, 'right']].forEach(([container, side]) => {
container.querySelectorAll('.toggle-btn:not(.leaf)').forEach(btn => {
if (btn.textContent === 'βΆ') {
const row = btn.closest('[data-path]');
if (row) snap[side].add(row.dataset.path);
}
});
});
return snap;
}
function restoreCollapsed(snap) {
[[leftTreeEl, 'left'], [rightTreeEl, 'right']].forEach(([container, side]) => {
container.querySelectorAll('.toggle-btn:not(.leaf)').forEach(btn => {
if (btn.textContent === 'βΌ') {
const row = btn.closest('[data-path]');
if (row && snap[side].has(row.dataset.path)) btn.click();
}
});
});
}
function openSearch() {
const bar = document.getElementById('search-bar');
bar.style.display = 'flex';
document.getElementById('search-input').select();
document.getElementById('search-input').focus();
if (!searchCollapsedSnapshot) searchCollapsedSnapshot = captureCollapsed();
}
function closeSearch() {
const bar = document.getElementById('search-bar');
if (!bar) return;
bar.style.display = 'none';
clearSearchHighlights();
searchMatches = [];
searchCurrent = -1;
document.getElementById('search-count').textContent = '';
if (searchCollapsedSnapshot) {
restoreCollapsed(searchCollapsedSnapshot);
searchCollapsedSnapshot = null;
}
}
function clearSearchHighlights() {
[diffSection, leftTreeEl, rightTreeEl].forEach(container => {
container.querySelectorAll('mark.sh').forEach(mark => {
const parent = mark.parentNode;
if (parent) {
parent.replaceChild(document.createTextNode(mark.textContent), mark);
parent.normalize();
}
});
});
}
function getTextNodes(container) {
const results = [];
const walker = document.createTreeWalker(container, NodeFilter.SHOW_TEXT, {
acceptNode(node) {
if (node.parentElement && node.parentElement.classList.contains('line-num')) {
return NodeFilter.FILTER_REJECT;
}
return NodeFilter.FILTER_ACCEPT;
}
});
let node;
while ((node = walker.nextNode())) results.push(node);
return results;
}
function runSearch() {
clearSearchHighlights();
searchMatches = [];
searchCurrent = -1;
const query = document.getElementById('search-input').value;
const countEl = document.getElementById('search-count');
if (!query) { countEl.textContent = ''; return; }
// Snapshot collapsed state (if not already), then expand all so every node is searchable
if (!searchCollapsedSnapshot) searchCollapsedSnapshot = captureCollapsed();
[leftTreeEl, rightTreeEl].forEach(container => {
container.querySelectorAll('.toggle-btn:not(.leaf)').forEach(btn => {
if (btn.textContent === 'βΆ') btn.click();
});
});
const lowerQuery = query.toLowerCase();
const containers = [diffSection, leftTreeEl, rightTreeEl].filter(
el => el.style.display !== 'none' && el.innerHTML
);
containers.forEach(container => {
getTextNodes(container).forEach(textNode => {
const text = textNode.textContent;
const lowerText = text.toLowerCase();
let idx = lowerText.indexOf(lowerQuery);
if (idx === -1) return;
const frag = document.createDocumentFragment();
let lastIdx = 0;
while (idx !== -1) {
if (idx > lastIdx) frag.appendChild(document.createTextNode(text.slice(lastIdx, idx)));
const mark = document.createElement('mark');
mark.className = 'sh';
mark.textContent = text.slice(idx, idx + query.length);
frag.appendChild(mark);
searchMatches.push(mark);
lastIdx = idx + query.length;
idx = lowerText.indexOf(lowerQuery, lastIdx);
}
if (lastIdx < text.length) frag.appendChild(document.createTextNode(text.slice(lastIdx)));
textNode.parentNode.replaceChild(frag, textNode);
});
});
if (searchMatches.length === 0) {
countEl.textContent = 'No matches';
countEl.className = 'text-[0.7rem] text-red-400 whitespace-nowrap select-none';
return;
}
countEl.className = 'text-[0.7rem] text-gray-500 whitespace-nowrap select-none';
searchCurrent = 0;
updateSearchActive();
}
function updateSearchActive() {
searchMatches.forEach((m, i) => {
m.className = i === searchCurrent ? 'sh sh-active' : 'sh';
});
const active = searchMatches[searchCurrent];
if (active) active.scrollIntoView({ block: 'center', behavior: 'smooth' });
document.getElementById('search-count').textContent =
`${searchCurrent + 1} / ${searchMatches.length}`;
}
function navigateSearch(dir) {
if (searchMatches.length === 0) return;
searchCurrent = (searchCurrent + dir + searchMatches.length) % searchMatches.length;
updateSearchActive();
}
function onSearchKey(e) {
if (e.key === 'Enter') {
e.preventDefault();
navigateSearch(e.shiftKey ? -1 : 1);
} else if (e.key === 'Escape') {
closeSearch();
}
}
document.addEventListener('keydown', (e) => {
if ((e.ctrlKey || e.metaKey) && e.key === 'f') {
e.preventDefault();
openSearch();
}
});
leftEl.focus();
</script>
</body>
</html>