JSON diff viewer Data Tools
In-browser processing
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JSON diff viewer

View differences between two JSON documents side by side in your browser.

Inspect changed paths and the comparison tree without uploading data.

Browser-only processing, with no server upload
Array-aware modes reduce review noise
Export JSON Patch and JSON Merge Patch
Everything stays in your browser session. Nothing is uploaded.

Recommended workflow

  1. Clean or sort the JSON first with JSON Formatter or JSON Key Sorter when you want consistent input.
  2. Paste or upload the left and right JSON documents, then run Compare.
  3. Choose the array mode, match keys, tolerance, and path rules that fit the review.
  4. Review the summary, changed paths, tree, and exportable patch output.

Example

This example highlights changed values, reordered arrays, and added items in a clear side-by-side view.

Before

Input 
{
  "orderId": "A-1001",
  "updatedAt": "2026-04-16T08:00:00Z",
  "customer": {
    "name": "Acme Corp",
    "tags": ["vip", "beta"]
  },
  "items": [
    {
      "sku": "A-1",
      "qty": 2,
      "price": 10
    },
    {
      "sku": "B-2",
      "qty": 1,
      "price": 4.5
    }
  ],
  "summary": {
    "currency": "USD",
    "total": 24.5
  }
}

After

Input 
{
  "orderId": "A-1001",
  "updatedAt": "2026-04-16T08:05:00Z",
  "customer": {
    "name": "Acme Corporation",
    "tags": ["beta", "vip"]
  },
  "items": [
    {
      "sku": "B-2",
      "qty": 1,
      "price": 4.5
    },
    {
      "sku": "A-1",
      "qty": 2,
      "price": 10.0001
    },
    {
      "sku": "C-3",
      "qty": 1,
      "price": 7
    }
  ],
  "summary": {
    "currency": "USD",
    "total": 24.5001
  }
}

What this example shows

This example highlights changed values, reordered arrays, and added items in a clear side-by-side view.

How to use

  1. Paste or upload the left and right JSON documents.
  2. Choose a comparison mode and review the paths that changed.
  3. Run Compare or Validate depending on your goal.
  4. Copy or download the result when you are done.

What you can do

  • Compare JSON semantically instead of line by line.
  • Match array items by key(s) such as id, sku, or code.
  • Ignore paths, select paths, or apply comparison rules to individual paths.
  • Use numeric tolerance to smooth over tiny floating-point differences.
  • Export JSON Patch, JSON Merge Patch, changed paths, and a Markdown report.
  • Collapse unchanged nodes and jump directly to the relevant path.

Comparison rules and output

  • Processing runs entirely in the browser. Nothing is uploaded.
  • Strict, ignore-order, multiset, and match-by-key array modes are supported.
  • Path rules support ignore, strict, ignore-order, multiset, match-keys, and tolerance modes.
  • Numeric tolerance is applied to numbers only.
  • Comments can be stripped before parse when needed.
  • Large inputs use summary-first rendering and can disable auto-compare.

FAQ

Can I compare arrays of objects by key?

Yes. Choose Match by key(s) and list keys such as id or sku. You can also override the rule for a specific path.

How do I ignore timestamps or request IDs?

Add them to Ignore paths, or use a path rule when the exception should apply to one subtree only.

Can I keep array order for some parts and ignore it for others?

Yes. Use path rules to set ignore-order, multiset, or match-keys only where needed.

Does it support JSON with comments?

Standard JSON does not allow comments. Turn on Strip comments before parse only when you need to accept JSONC input.

Is anything uploaded to a server?

No. Comparison, normalization, and export all happen locally in your browser; nothing is uploaded.

What can I export?

You can export JSON Patch, JSON Merge Patch, changed paths, and a Markdown report.