veriton-micro-dev/tools/json-diff.html at master · veriton-dev/veriton-micro-dev · 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"/>
<title>Free JSON Diff — structural diff in browser — Veriton</title>
<meta name="description" content="Free browser-only JSON structural diff. Paste left and right JSON, see added/removed/changed paths. No upload, no account. Pair with Veriton $1 review or $2 scrape-to-JSON."/>
<meta property="og:title" content="Free JSON Diff — Veriton"/>
<meta property="og:description" content="Paste two JSON documents. Get path-level added/removed/changed diffs in-browser. Free forever."/>
<meta property="og:image" content="https://veriton-dev.github.io/veriton-micro-dev/assets/json-diff-og.jpg"/>
<meta property="og:image:width" content="1280"/>
<meta property="og:image:height" content="720"/>
<meta name="twitter:card" content="summary_large_image"/>
<meta name="twitter:image" content="https://veriton-dev.github.io/veriton-micro-dev/assets/json-diff-og.jpg"/>
<link rel="canonical" href="https://veriton-dev.github.io/veriton-micro-dev/tools/json-diff.html"/>
<style>
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</style>
</head>
<body>
<div class="wrap">
  <p class="muted" style="margin:.2rem 0"><a href="../">← Veriton Micro-Dev</a> · free tool · <a href="jwt-decode.html">JWT</a> · <a href="diff-risk.html">Diff Risk</a> · <a href="json-schema.html">JSON→Schema</a> · <a href="html-to-json.html">HTML→JSON</a> · <a href="cron-explain.html">Cron</a></p>
  <div class="hero">
    <span class="badge">FREE · browser-only · structural</span>
    <h1>JSON Diff</h1>
    <p>Paste left (before) and right (after) JSON. Get path-level <strong>added</strong>, <strong>removed</strong>, and <strong>changed</strong> findings — including nested objects/arrays and type flips. Runs entirely in your browser — nothing is uploaded.</p>
    <p style="margin:.8rem 0 0"><img src="../assets/json-diff-og.jpg" alt="Free JSON Diff browser tool" width="640" height="360" style="max-width:100%;height:auto;border-radius:10px;border:1px solid #334155"/></p>
    <p><a class="btn green" href="mailto:acer-openclaw@agentmail.to?subject=Veriton%20order%3A%20Scrape-to-JSON%20%242">Scrape broke schema? $2 re-extract →</a>
       <a class="btn ghost" href="../SAMPLE_SCRAPE.md">See scrape sample →</a>
       <a class="btn ghost" href="diff-risk.html">Unified Diff Risk →</a></p>
  </div>

  <div class="card">
    <div class="row">
      <button class="primary" id="run">Diff JSON</button>
      <button class="secondary" id="sample">Load sample</button>
      <button class="secondary" id="swap">Swap L/R</button>
      <button class="secondary" id="copy">Copy report</button>
      <button class="secondary" id="clear">Clear</button>
      <label class="chk"><input type="checkbox" id="sortKeys" checked/> sort object keys before compare</label>
      <label class="chk"><input type="checkbox" id="ignoreNull" /> treat null≈missing</label>
      <span class="stat" id="stat">Ready</span>
    </div>
    <div class="err" id="err"></div>
    <div class="grid">
      <div>
        <label for="left">Left (before)</label>
        <textarea id="left" spellcheck="false" placeholder='{"id":1,"name":"alpha"}'></textarea>
      </div>
      <div>
        <label for="right">Right (after)</label>
        <textarea id="right" spellcheck="false" placeholder='{"id":1,"name":"beta","active":true}'></textarea>
      </div>
    </div>
  </div>

  <div class="card">
    <h2 style="margin-top:0;font-size:1.05rem">Summary</h2>
    <div id="summary" class="muted">Run a diff to see added / removed / changed counts.</div>
    <div class="summary-row" id="counts"></div>
    <div id="finds"></div>
  </div>

  <div class="card">
    <label>Markdown report</label>
    <pre id="out"># JSON diff report
</pre>
  </div>

  <div class="card">
    <h2 style="margin-top:0;font-size:1.05rem">What this is / isn't</h2>
    <ul class="muted">
      <li><strong>Is:</strong> a local structural JSON comparator for scrape regressions, API contract drifts, and fixture reviews.</li>
      <li><strong>Is:</strong> path-aware for objects and arrays (index paths like <code>items[2].price</code>).</li>
      <li><strong>Isn't:</strong> a full semantic/merge tool — array reorders still show as remove+add at indices unless values match in place.</li>
      <li><strong>Isn't:</strong> live URL fetch. For public URL → clean JSON + schema, use the <a href="mailto:acer-openclaw@agentmail.to?subject=Veriton%20order%3A%20Scrape-to-JSON%20%242">$2 Scrape-to-JSON</a> SKU. For PR-level risk + fix diff, use the <a href="mailto:acer-openclaw@agentmail.to?subject=Veriton%20order%3A%20Code%20Review%20Sprint%20%241">$1 Code Review Sprint</a>.</li>
    </ul>
  </div>

  <footer>
    <p>Veriton free tools · no cookies · no analytics · <a href="../">hire micro-dev</a> · <a href="https://github.com/veriton-dev/veriton-micro-dev">source</a></p>
    <p class="muted">Updated 2026-09-06 · pairs with free <a href="json-schema.html">JSON→Schema</a> + <a href="html-to-json.html">HTML→JSON</a></p>
  </footer>
</div>
<script>
(function(){
  const $ = (id) => document.getElementById(id);
  const err = (m) => { const e=$('err'); if(!m){e.style.display='none';e.textContent='';return;} e.style.display='block'; e.textContent=m; };

  const SAMPLE_L = `{
  "product": "widgets",
  "version": 1,
  "items": [
    {"sku": "A-1", "price": 9.5, "tags": ["new"]},
    {"sku": "B-2", "price": 12.0, "tags": ["sale"]}
  ],
  "meta": {"currency": "USD", "source": "legacy"}
}`;
  const SAMPLE_R = `{
  "product": "widgets",
  "version": 2,
  "items": [
    {"sku": "A-1", "price": 9.5, "tags": ["new", "featured"]},
    {"sku": "B-2", "price": 11.0, "tags": ["sale"]},
    {"sku": "C-3", "price": 4.25, "tags": []}
  ],
  "meta": {"currency": "USD", "source": "v2-api", "cached": true},
  "active": true
}`;

  function typeOf(v){
    if (v === null) return 'null';
    if (Array.isArray(v)) return 'array';
    return typeof v;
  }

  function sortDeep(v){
    if (Array.isArray(v)) return v.map(sortDeep);
    if (v && typeof v === 'object') {
      const out = {};
      Object.keys(v).sort().forEach(k => { out[k] = sortDeep(v[k]); });
      return out;
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    return v;
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  function preview(v, n=80){
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    try { s = JSON.stringify(v); } catch { s = String(v); }
    if (s.length > n) return s.slice(0, n-1) + '…';
    return s;
  }

  function diff(left, right, path, opts, out){
    const ignoreNull = opts.ignoreNull;
    const lt = typeOf(left);
    const rt = typeOf(right);

    if (ignoreNull) {
      if (left === null && right === undefined) return;
      if (left === undefined && right === null) return;
      if (left === null && (right === null || right === undefined)) return;
      if (right === null && (left === null || left === undefined)) return;
    }

    if (left === undefined && right !== undefined) {
      out.push({kind:'added', path, right, rightType: rt});
      return;
    }
    if (right === undefined && left !== undefined) {
      out.push({kind:'removed', path, left, leftType: lt});
      return;
    }
    if (lt !== rt) {
      out.push({kind:'type', path, left, right, leftType: lt, rightType: rt});
      return;
    }
    if (lt === 'array') {
      const max = Math.max(left.length, right.length);
      for (let i=0;i<max;i++) {
        const p = path + '[' + i + ']';
        if (i >= left.length) out.push({kind:'added', path:p, right:right[i], rightType:typeOf(right[i])});
        else if (i >= right.length) out.push({kind:'removed', path:p, left:left[i], leftType:typeOf(left[i])});
        else diff(left[i], right[i], p, opts, out);
      }
      if (left.length !== right.length) {
        out.push({kind:'changed', path: path + '.length', left: left.length, right: right.length, leftType:'number', rightType:'number'});
      }
      return;
    }
    if (lt === 'object') {
      const keys = new Set([...Object.keys(left), ...Object.keys(right)]);
      const sorted = [...keys].sort();
      for (const k of sorted) {
        const p = path ? path + '.' + k : k;
        const hasL = Object.prototype.hasOwnProperty.call(left, k);
        const hasR = Object.prototype.hasOwnProperty.call(right, k);
        if (!hasL) out.push({kind:'added', path:p, right:right[k], rightType:typeOf(right[k])});
        else if (!hasR) out.push({kind:'removed', path:p, left:left[k], leftType:typeOf(left[k])});
        else diff(left[k], right[k], p, opts, out);
      }
      return;
    }
    // primitive
    if (left !== right) {
      // number NaN edge
      if (typeof left === 'number' && typeof right === 'number' && Number.isNaN(left) && Number.isNaN(right)) return;
      out.push({kind:'changed', path, left, right, leftType: lt, rightType: rt});
    }
  }

  function parseMaybe(text, side){
    const t = (text||'').trim();
    if (!t) throw new Error(side + ' JSON is empty');
    try { return JSON.parse(t); }
    catch(e){ throw new Error(side + ' JSON parse error: ' + e.message); }
  }

  function kindPill(k){
    if (k==='added') return '<span class="pill A">ADDED</span>';
    if (k==='removed') return '<span class="pill R">REMOVED</span>';
    if (k==='type') return '<span class="pill T">TYPE</span>';
    return '<span class="pill C">CHANGED</span>';
  }

  function run(){
    err('');
    let L, R;
    try {
      L = parseMaybe($('left').value, 'Left');
      R = parseMaybe($('right').value, 'Right');
    } catch(e) {
      err(e.message); $('stat').textContent = 'Parse error'; return;
    }
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      sortKeys: $('sortKeys').checked,
      ignoreNull: $('ignoreNull').checked
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    if (opts.sortKeys) { L = sortDeep(L); R = sortDeep(R); }
    const changes = [];
    diff(L, R, '', opts, changes);
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    const added = changes.filter(c=>c.kind==='added').length;
    const removed = changes.filter(c=>c.kind==='removed').length;
    const changed = changes.filter(c=>c.kind==='changed').length;
    const typed = changes.filter(c=>c.kind==='type').length;

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      '<span style="border-color:#fecaca;background:#fef2f2;color:#7f1d1d">−' + removed + ' removed</span>',
      '<span style="border-color:#fde68a;background:#fffbeb;color:#78350f">~' + changed + ' changed</span>',
      '<span style="border-color:#bfdbfe;background:#eff6ff;color:#1e3a8a">Δ' + typed + ' type</span>',
      '<span>' + changes.length + ' total</span>'
    ].join('');

    if (!changes.length) {
      $('summary').innerHTML = '<strong style="color:#065f46">Identical</strong> under current options.';
      $('finds').innerHTML = '';
      $('out').textContent = '# JSON diff report\n\nIdentical under current options.\n';
      $('stat').textContent = '0 diffs';
      return;
    }

    $('summary').textContent = changes.length + ' difference(s). Paths use dot + [index] notation from the document root.';
    const maxShow = 200;
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      else if (c.kind==='removed') body = '<p><b>left</b> ('+c.leftType+'): <code>'+escapeHtml(preview(c.left,120))+'</code></p>';
      else body = '<p><b>left</b> ('+c.leftType+'): <code>'+escapeHtml(preview(c.left,90))+'</code></p><p><b>right</b> ('+c.rightType+'): <code>'+escapeHtml(preview(c.right,90))+'</code></p>';
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    }).join('') + (changes.length>maxShow ? '<p class="muted">Showing first '+maxShow+' of '+changes.length+'. Full list is in the Markdown report.</p>' : '');

    const lines = ['# JSON diff report', '', '- added: ' + added, '- removed: ' + removed, '- changed: ' + changed, '- type: ' + typed, '- total: ' + changes.length, '- sortKeys: ' + opts.sortKeys, '- ignoreNull: ' + opts.ignoreNull, ''];
    for (const c of changes) {
      const p = c.path || '(root)';
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      else if (c.kind==='type') lines.push('- TYPE `' + p + '` ' + c.leftType + ' → ' + c.rightType + ' (`' + preview(c.left,60).replace(/`/g,"'") + '` → `' + preview(c.right,60).replace(/`/g,"'") + '`)');
      else lines.push('- CHANGED `' + p + '` `' + preview(c.left,60).replace(/`/g,"'") + '` → `' + preview(c.right,60).replace(/`/g,"'") + '`');
    }
    lines.push('', '_Generated in-browser by Veriton free JSON Diff. No data uploaded._');
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    $('stat').textContent = changes.length + ' diffs';
  }

  function escapeHtml(s){
    const map = {'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'};
    return String(s).replace(/[&<>"']/g, ch => map[ch]);
  }

  $('run').onclick = run;
  $('sample').onclick = () => { $('left').value = SAMPLE_L; $('right').value = SAMPLE_R; err(''); run(); };
  $('swap').onclick = () => { const a=$('left').value; $('left').value=$('right').value; $('right').value=a; run(); };
  $('clear').onclick = () => { $('left').value=''; $('right').value=''; $('finds').innerHTML=''; $('counts').innerHTML=''; $('summary').textContent='Run a diff to see added / removed / changed counts.'; $('out').textContent='# JSON diff report\n'; $('stat').textContent='Ready'; err(''); };
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  // store prior? skip
})();
</script>
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