How are deep differences shown?

Nested paths are displayed with dot notation so you can locate the exact field that changed.

Can I diff very large JSON files?

Yes, though performance depends on browser memory. For files over ~20MB use a local diff tool.

JSON Diff

Highlight additions, deletions, and modifications between two JSON documents. Structural diff ignores key ordering differences by default.

Runs locally in your browser

For large JSONs, open fullscreen to compare comfortably

JSON A (original)

0 chars · 1 line

JSON B (compared)

0 chars · 1 line

Ignore array order (unordered diff)

Text Diff

Compare two blocks of text side-by-side.

JSON Formatter

Beautify and format JSON with configurable indentation.

JSON Validator

Validate JSON syntax and surface errors with line numbers.

About JSON Diff

Highlight additions, deletions, and modifications between two JSON documents. Structural diff ignores key ordering differences by default.

JSON Diff is part of FizzKit — a collection of focused, browser-based tools. Because everything runs locally, it works offline once loaded and never exposes your data to a remote server.

Frequently asked questions

Structural. Reordered keys in an object are considered equal; reordered array elements are flagged.

Related tools