JSON
JSON Compare
Side-by-side comparison of two JSON documents with structural highlighting to spot differences instantly.
Paste JSON into both panels to see the comparison.
Why use our JSON Compare?
100% private
Everything runs in your browser. Your data never leaves your device — safe for production payloads.
Instant results
No round trips, no rate limits, no login. Format, validate and inspect megabytes of JSON in milliseconds.
Standards-first
Follows RFC 8259 / ECMA-404 exactly. Reports errors with precise line and column diagnostics.
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Structural diff of two JSON objects or arrays showing added, removed and modified keys with paths.
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OpenJSON Minifier
Strip whitespace and shrink JSON payloads to the smallest possible size for APIs, storage, and network transfer.
OpenJSON Parser
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OpenRelated reading
Deep-dive guides that pair well with the JSON Compare.
Guides
What is JSON? A developer's introduction
Understand the JSON data format, its history, and why it dominates modern APIs and configuration files.
ReadComparisons
JSON vs XML: which should you use?
Compare readability, verbosity, tooling, schema support and performance between JSON and XML in modern systems.
ReadDeveloper Tips
10 common JSON errors and how to fix them
Every JSON syntax error you'll ever see — trailing commas, unquoted keys, bad escapes — with a working repair strategy.
Read