JSON Compare
Free online JSON comparison tool. Compare two JSON objects side by side, find differences with dot-notation paths, detect missing keys and value mismatches. Runs entirely in your browser with no data upload.
How does JSON comparison work?
The tool recursively compares two JSON objects and reports differences: keys missing in either object, values that don't match, and structural changes. Differences are shown with dot-notation paths like "user.address.city".
What output formats are available?
You can choose between Text format (human-readable with color coding) and JSON format (structured key-value differences). Both formats clearly highlight what changed.
Does it handle nested objects and arrays?
Yes, the comparison is fully recursive and handles deeply nested objects, arrays, and mixed data structures. Array order matters in comparisons.
Is my data safe and private?
Yes. All processing happens locally in your browser. No data is sent to any server, ensuring complete privacy and security for your JSON files.
Can I compare large JSON files?
Yes, the tool handles large JSON files efficiently. Processing happens client-side, so performance depends on your device capabilities.
What are common use cases?
Common uses include comparing API responses, tracking configuration changes, debugging data transformations, reviewing database exports, and validating JSON schema migrations.
Does it validate JSON syntax?
The tool focuses on comparison, but will indicate if the input isn't valid JSON. For comprehensive validation, use a dedicated JSON validator.
Can I merge JSON differences?
The tool shows differences but doesn't merge them. For merging, you'd need a separate JSON merge tool or manual editing.
How are arrays compared?
Arrays are compared element-by-element in order. If array lengths differ, extra elements are reported as additions or deletions.
What dot-notation paths mean?
Dot-notation paths show the exact location of differences. For example, "users[0].name" means the name field in the first element of the users array.
Can I compare JSON from URLs or files?
Currently, you need to paste JSON directly into the input fields. Copy JSON from URLs or files and paste it for comparison.
Is there an API for JSON comparison?
This is a browser-based tool without an API. For programmatic comparison, consider using JavaScript libraries like deep-diff or lodash.isEqual.
How to Use JSON Compare
Compare two JSON objects side by side and see every difference reported as a dot-notation path, including missing keys and value mismatches. Everything runs locally in your browser, so your data never leaves your device.
- Choose the input mode with the “Text” or “JSON” tab, depending on whether you want raw text or parsed JSON comparison.
- Paste the first JSON document into the left editor and the second one into the right editor.
- Differences are detected as you type and listed as dot-notation paths such as user.address.city.
- Review the results for keys missing on either side and values that do not match between the two objects.
- Edit either document in place to verify fixes until no differences remain.
The “JSON” mode parses both documents first, so differences in formatting and key order are ignored and only real data changes are reported.
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