JSON Diff Checker
Deep-compare two JSON objects and see every structural difference.
Original
Modified
Built for large files. Comparison runs in a background thread — your browser won't freeze even with megabytes of JSON. Results show the full JSON path to every difference.
About JSON Diff Checker
A deep JSON comparison tool that finds every structural difference between two JSON objects. Unlike text diff tools that compare line-by-line, this tool understands JSON structure — it shows the exact path to each change, whether a key was added, removed, modified, or had its type changed. Comparison runs in a Web Worker (background thread) so your browser stays responsive even with large files. No data is uploaded — everything runs locally.
FAQ
- How is this different from a regular text diff?
- A text diff compares lines of text. This tool parses both JSON documents and compares their structure — it understands objects, arrays, and nesting. You get the exact JSON path (like data.users[0].name) for every difference, plus type-change detection.
- Will this freeze my browser with large JSON files?
- No. The comparison runs in a Web Worker (a background thread), so the main browser thread stays free. You'll see real-time progress while it computes. Even multi-megabyte files won't lock up your tab.
- Does this tool upload my JSON anywhere?
- No. Everything runs 100% in your browser. Your data never leaves your device.
- Does key order matter?
- No. JSON objects are unordered by spec, so {a:1, b:2} and {b:2, a:1} are treated as identical.