JSON Compare Online Free

Compare two JSON objects and highlight differences

JSON A (Left)

JSON B (Right)

JSON Compare Online Free - Compare Two JSON Objects

Compare two JSON objects side by side online free. The tool recursively compares all keys and values, highlighting added keys (green), removed keys (red), and changed values (yellow). Shows the full dot-notation path for nested keys. 100% browser-based — your data never leaves your device. Essential for debugging API response changes, comparing configuration files, and reviewing data migrations.

Key Features

Detect added, removed, and changed keys

Recursive comparison of nested objects

Dot-notation path for nested keys (e.g. user.address.city)

Color-coded results (green/red/yellow)

Shows old and new values for changes

Difference count summary

100% browser-based

Pre-filled example for quick start

Free, no registration required

When to Compare JSON?

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.

Benefits

•Debug API response changes between versions
•Compare configuration file versions quickly
•Review data migration transformations
•Understand what changed between JSON snapshots
•Verify API contract compliance
•Find missing or extra keys in JSON responses

How to Compare JSON

1Paste JSON A (original) in the left panel
2Paste JSON B (modified) in the right panel
3Click 'Compare JSON' to run the comparison
4View added keys in green, removed in red, changed in yellow
5Each difference shows the full path and values
6The summary shows total added, removed, and unchanged count

Understanding the Comparison Results

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.

Frequently Asked Questions

Does it support nested objects?

Yes, the tool recursively compares nested objects and shows the full dot-notation path (e.g. user.address.city).

Does it support arrays?

Arrays are compared as values. If the array content differs, it shows as a 'changed' difference.

What does 'ADDED' mean?

ADDED means the key exists in JSON B (right) but not in JSON A (left). It's a new key that was added.

What does 'REMOVED' mean?

REMOVED means the key exists in JSON A (left) but not in JSON B (right). It's a key that was deleted.

Is there a size limit for JSON comparison?

No hard limit. The tool handles large JSON objects, though very deeply nested structures may be slow to compare.

Related Keywords

json compare onlinecompare json objectsjson diff tooljson comparisonjson difference checkerjson diff viewercompare json filesjson object comparison

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