JSON Diff -- Compare Two JSON Objects Online

What is JSON Diff?

JSON Diff is a tool that compares two JSON objects and highlights the structural differences between them. Unlike plain text diff, it understands the JSON structure and can show exactly which keys were added, removed, or had their values changed. This makes it ideal for comparing API responses, configuration files, database records, and any other JSON data.

How does the comparison work?

The tool recursively walks both JSON trees simultaneously. For each key, it determines whether the key exists only in the original (removed), only in the modified version (added), or in both but with different values (modified). Arrays are compared by index. The result is displayed as an interactive tree view with color-coded differences: green for added, red for removed, and yellow for modified values.

Options explained

• Ignore key order — Treats objects with the same keys but in different order as equal.
• Ignore whitespace — Normalizes whitespace before parsing, useful when comparing formatted vs. minified JSON.
• Show unchanged — Displays keys that are identical in both versions.
• Expand all — Expands all tree nodes by default for a full overview.

Common use cases

Comparing REST API responses across environments, reviewing configuration changes before deployment, debugging data transformations, verifying database migration results, and tracking changes in JSON-based settings files.

FAQ

Is my data safe?

Yes. All comparison happens entirely in your browser. No data is sent to any server.

Can it compare nested objects?

Yes. The tool recursively compares deeply nested objects and arrays at any depth level, showing differences at each level of the tree.

What about large JSON files?

The tool handles reasonably large JSON structures efficiently since all processing happens client-side. For extremely large files (several MB), performance may vary depending on your browser.

Frequently Asked Questions