JSON Compare — Compare Two JSON Documents Online

What is JSON Compare?

Compare two JSON documents side by side. See added, removed, and changed keys.

Compare two JSON documents in left and right panels. See a clear diff of added, removed, and changed keys. Useful for config reviews, API changes, and data migration. Runs in your browser. Part of formatterjson.org.

How to Use JSON Compare

1. Paste or type your input into the editor on the left panel.
2. Results update automatically while you type. You can also press Ctrl+Enter to force a refresh.
3. View the result in the output panel on the right with full syntax highlighting.
4. Use Copy or Download to export the result.
5. Drag and drop .json or .txt files directly into the editor.
6. Toggle Tree View for an interactive, collapsible view of the JSON structure.

Example

{}

Paste left and right JSON above.

Common Use Cases

• Config changes
• API version diff
• Data migration

Common Errors

• Invalid JSON in either panel

Why Use Our JSON Compare?

• 100% client-side — your data never leaves your browser. No server processing, no data collection.
• No sign-up required — start using the tool instantly with no registration or installation.
• Keyboard shortcuts — press Ctrl+Enter to run, ? for shortcuts list, Ctrl+B to toggle sidebar.
• Persistent state — your input is automatically saved across sessions using local storage.
• IDE-style interface — Monaco Editor (the engine behind VS Code) with syntax highlighting and error detection.
• Multi-format conversion — convert between JSON, XML, CSV, and YAML without switching tools.

Frequently Asked Questions

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