Original JSON
Modified JSON
Compare two JSON objects side by side and instantly see every difference. The tool performs a deep, recursive comparison of your JSON structures, detecting additions, removals, and value changes at every nesting level. All processing happens client-side — your data never leaves your browser.
Use it to debug API responses, compare configuration files, verify data migrations, or review JSON payloads before and after transformations. Paste your JSON, click Compare, and get a clear, color-coded diff in seconds.
How to Compare JSON
- Paste the original JSON in the left panel.
- Paste the modified JSON in the right panel.
- Click Compare or let auto-compare detect changes.
- Review the color-coded diff: green = added, red = removed, yellow = changed.
- Copy or download the diff results.
Frequently Asked Questions
How do I compare two JSON objects?
Paste the original JSON in the left panel and the modified JSON in the right panel. The tool automatically performs a deep comparison and highlights all differences with color coding: green for additions, red for deletions, and yellow for changed values.
Does key order matter when comparing JSON?
No, key order does not matter for JSON objects — only the values are compared. For arrays, element order matters and elements are compared by their index position.
What types of differences does the JSON compare tool detect?
The tool detects three types of differences: additions (keys present in the modified JSON but not the original), removals (keys present in the original but not the modified), and changes (same key with different values). It works recursively through nested objects and arrays.
Is the JSON compare tool free and private?
Yes, the tool is completely free with no registration required. All comparison happens in your browser using JavaScript — your JSON data is never sent to any server, making it safe for sensitive data.
Can I compare large JSON files?
Yes, the tool can handle JSON files up to several megabytes. Since all processing happens client-side, the limit depends on your browser's available memory. For very large files, the comparison may take a moment.
What is a JSON diff?
A JSON diff is the set of differences between two JSON documents. It shows which keys or values were added, removed, or modified. JSON diff tools are commonly used by developers to debug API responses, compare configuration files, and verify data transformations.
Can I compare nested JSON objects?
Yes, the tool performs a deep recursive comparison. It traverses every level of nesting in both objects and reports differences with their full path (e.g., address.city or items[2].name), so you can see exactly where each change occurred.