Tool
JSON Diff
JSON Diff
Compare two JSON objects side-by-side to quickly identify differences in structure, keys, and values. This tool is designed for QA teams, analysts, and operations staff working with API responses, configuration files, or data migrations. Paste two JSON payloads into the editor, and the tool highlights added, removed, and modified elements in real time. It supports deep nesting, formatted output, and synchronized scrolling for easy visual comparison. Whether you're validating integrations, debugging discrepancies, or reviewing schema changes, this tool makes it fast and intuitive. Everything runs client-side, ensuring privacy, speed, and a distraction-free environment for precise JSON inspection.
Compare two JSON files and see exactly what is different.
JSON Diff
Compare JSON side by side with inline differences.Left JSON
Right JSON
Examples
Load a larger example to see side-by-side differences.How it works
The JSON Diff tool compares two JSON objects and highlights differences inline so you can spot additions, removals, and value changes quickly.
Use it to verify changes between JSON payloads and highlight additions, removals, and differences.
What you can do with it
- Pinpoints differences in nested data without extra steps.
- Ideal for tracking API regressions or payload drift.
- Inline diff view makes differences obvious.
Common tasks
- Review differences between API versions.
- Validate config differences before release.
- Spot missing keys or unexpected values quickly.
Quick steps
- Paste JSON object A on the left and JSON object B on the right.
- Use Normalize if you want key order ignored.
- Review the inline differences and quick summary.
Before you start
- Paste JSON into both sides.
- Load an example to see larger diffs.
What you get
- Inline diff view with highlights.
- A summary of added, removed, and different items.
Common pitfalls
- Invalid JSON on either side will block comparison.
- Very large files can slow diff rendering.
Tips for best results
- Paste raw input so the tool can apply formatting consistently.
- If output looks wrong, validate the input for missing commas or tags.
- Use the example buttons above to sanity-check formatting and behavior.
Accuracy & limitations
- Outputs are deterministic and based only on the input you provide.
- When official specs exist, the tool favors strict parsing over guesses.
- URL-based tools can vary by region, cache, or upstream availability.
- Always validate critical outputs in your production systems before launch.
Trust & quality
- Deterministic diff engine with clear adds/removes/changes.
- Normalization is optional and visible to the user.
Who it is for
- QA and support teams validating outputs before launch.
- Analysts and operators who need fast clarity on raw data.
- Engineers and technical writers documenting system behavior.
When to use this tool
- You need a quick answer without scripting or a full IDE.
- You want a repeatable, shareable output for teammates.
- You are troubleshooting inconsistent or malformed input.
Quick checklist
- Input is complete and copied in full.
- Output matches expectations and no errors are shown.
- Share or export the result if you need to keep a record.
Frequently asked questions
Is it free to use?
Yes. Core tools are free and accessible without signup.
Does it upload my data?
This tool runs locally in your browser. Data you paste or files you upload stay on your device and are not uploaded.
What if I spot a bug?
Please reach out via the Contact page with a reproduction example.
Does it ignore key order?
Yes when Normalize is enabled. It sorts object keys before diffing.
How are arrays compared?
Arrays are compared index-by-index and differences are reported per position.
Is data uploaded?
No. Diffing happens locally in your browser.
Helpful links
Standards & references
Official specs that inform how this tool interprets data.