Online JSON Diff & Comparison Tool

Compare two JSON documents side-by-side with semantic normalization, syntax highlighting, and change counters.

100% Client-Side Processing — your JSON never leaves this browser. Works offline. How it works

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Input
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Result
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About this tool

How the JSON Diff works

Compare two JSON files or strings side-by-side. Highlight additions, deletions, and key-value modifications with semantic JSON diffing.

Side-by-Side & Unified Diffs

Visual color-coded comparison highlighting additions (+), deletions (-), and modifications (~).

Semantic Normalization

Automatically aligns indentation and formats both inputs so whitespace differences do not clutter results.

Swap Inputs & Stats

One-click button to swap left and right documents, with real-time stats for changes made.

Private & Secure

Compare production configuration files, database records, and API responses with complete privacy.

FAQ

Common questions

How does JSON Diff handle different key orders?

Our tool can sort and normalize keys before comparison, ensuring only real data changes are highlighted rather than arbitrary key ordering.

Can I compare large API responses?

Yes! Both JSON inputs are processed directly in your browser with optimized line comparison.

What do the colors mean?

Green highlights lines or values added in the right input, red indicates deleted items, and amber represents modified values.

Does any comparison data get stored?

None. Your inputs remain entirely in your browser memory and are discarded when you close or refresh the tab.

Keep going

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