Compare two JSON objects and highlight differences
JSON A (Left)
JSON B (Right)
Compare two JSON objects side by side online free. The tool recursively compares keys and values, highlighting added keys in green, removed keys in red, and changed values in yellow. It shows dot-notation paths for nested objects and indexes inside arrays, making it easier to debug API response changes, compare configuration files, review data migrations, and inspect JSON snapshots. Processing happens in your browser, so your JSON is not uploaded by this tool.
JSON comparison is a daily task for developers working with APIs. When an API response changes between versions, you need to know exactly what changed. When migrating data between systems, you need to verify the transformation is correct. When reviewing configuration changes, you need to see what was added or removed. This tool makes JSON comparison instant and visual, without writing custom comparison code.
ADDED (green) means the key exists in JSON B but not in JSON A — it was added. REMOVED (red) means the key exists in JSON A but not in JSON B — it was deleted. CHANGED (yellow) shows both the old value (red) and new value (green) for keys that exist in both but have different values. The path uses dot notation for nested keys: user.address.city means the city key inside address inside user.
Use JSON Compare when checking API version changes, validating webhook payloads, comparing before-and-after database exports, reviewing configuration changes, debugging feature flags, or confirming that a migration preserved the expected fields. The path display helps you find the exact nested value that changed without scanning the full JSON manually.
This tool compares parsed JSON values and reports added, removed, or changed paths. It does not preserve formatting, comments, key order intent, or semantic meaning beyond the JSON structure. For very large files, dedicated diff tools or command-line workflows may be faster. Always validate sensitive API or production data in your approved development environment.
JSON Compare Online Free is useful when you need to complete a focused task quickly without installing desktop software, creating another account, or switching into a heavy workflow. It works well for quick checks, conversions, previews, cleanups, generation tasks, and everyday operations where speed and consistency matter. Compare two JSON objects side by side online free. The tool recursively compares keys and values, highlighting added keys in green, removed keys in red, and changed values in yellow. It shows dot-notation paths for nested objects and indexes inside arrays, making it easier to debug API response changes, compare configuration files, review data migrations, and inspect JSON snapshots. Processing happens in your browser, so your JSON is not uploaded by this tool.
Start with a small sample so you understand how JSON Compare Online Free handles your input, then apply it to the full task. Review the important fields, copy or export the result, and test it in the place where you plan to use it. This keeps the tool fast while still giving you a practical quality-control step before production use.
Yes, the tool recursively compares nested objects and shows the full dot-notation path (e.g. user.address.city).
Yes. Arrays are objects in JavaScript, so the tool compares array indexes and shows paths such as items.0.name when nested values differ.
ADDED means the key exists in JSON B (right) but not in JSON A (left). It's a new key that was added.
REMOVED means the key exists in JSON A (left) but not in JSON B (right). It's a key that was deleted.
No hard limit. The tool handles large JSON objects, though very deeply nested structures may be slow to compare.
Yes. JSON Compare Online Free is designed as a free browser-based utility for quick personal, learning, and professional workflows.
No. You can use JSON Compare Online Free directly in a modern browser such as Chrome, Edge, Safari, or Firefox.
Yes. The page is responsive and can be used on phones and tablets, although desktop is usually more comfortable for long input or repeated copy operations.
Use clean input, test with a small sample first, review the output carefully, and adjust any details that depend on your final use case.
In most cases, yes. You can use the generated or processed output in personal and commercial projects, but legal, financial, medical, or security-sensitive work should still be reviewed by a qualified person.
The tool is built for quick browser workflows. You should still avoid entering highly sensitive data unless the specific tool clearly states how the data is handled.
Many tools include copy or download actions. If a dedicated export is not available, you can usually copy the visible result manually.
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Tạo file .env và .env.example cho dự án.
Tạo .gitignore cho Node.js, Python, Java.
Tạo mock JSON data cho API testing.
Format và phân tích API response.
Test REST API: GET, POST, PUT, DELETE.
Giải thích regex, flags, capture group và cảnh báo pattern dễ lỗi.
Tạo OpenAPI JSON/YAML với params, auth và request body.
Chuyển đổi Binary, Hex, Base32.
Mã hóa/giải mã Base64.
Chuyển đổi Decimal, Binary, Hex.
Tạo CSS box-shadow trực quan.
Tính quyền file Linux.
