🔍 JSON Compare

Compare two JSON objects side by side. Find added, removed, and changed keys instantly.

📌 Embed This Tool

Add the JSON Compare to your website for free. Just copy and paste the code below.

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📋 When to Use the JSON Compare

The JSON Compare is ideal when you need to convert between formats or units quickly — whether you're reformatting data for a different tool, preparing content for a client, or just trying to make sense of incompatible file types. Use it when working remotely without access to desktop software, when sharing screens in a meeting and need a fast conversion, or when you want to avoid uploading sensitive files to unknown servers. Everything processes in your browser for maximum privacy.

⚙️ How the JSON Compare Works

The JSON Compare processes your input using conversion algorithms that run entirely in your browser. When you paste or upload content and select the output format, JavaScript parses the input, transforms it using format-specific logic (encoding, decoding, parsing, serializing), and produces the converted output. For file conversions, all processing uses browser-native APIs and JavaScript libraries loaded from CDN — your files are never uploaded to any server. The entire pipeline from input to output stays on your device.

How to Use JSON Compare

Paste JSON in both panels — put the original/old JSON on the left and the new/modified JSON on the right. The tool comes pre-filled with sample data.
View the diff instantly — the output shows added keys (🟢 green), removed keys (🔴 red), and changed values (🟡 yellow for modified) with clear visual indicators.
Drill into nested changes — the comparison is recursive, finding differences at any depth in the object hierarchy, including array changes.
Copy and iterate — use the diff to understand what changed between API response versions, config files, or data exports.

Frequently Asked Questions

How does JSON Compare handle arrays?

Arrays are compared element-by-element by index. If an array has different lengths, the extra elements in the longer array are flagged as added or removed. For arrays with reordered items, the tool compares by position, not by value matching — use a dedicated JSON diff tool for deep array reordering.

Can I compare deeply nested objects?

Yes. The comparison algorithm recursively traverses all levels of nesting. Objects within objects, arrays within objects, and any combination are fully supported. There's no depth limit beyond browser memory.

What if my JSON has syntax errors?

The tool will show an error message if either input isn't valid JSON. Use the JSON Formatter first to validate and fix syntax issues, then come back to compare.

Is this suitable for comparing large configuration files?

Yes, for files up to a few megabytes. For very large JSON files (100MB+), browser memory may become a limitation. For enterprise-scale comparisons, consider command-line tools like jq with diff.