JSON
JSON Diff
Structural diff of two JSON objects or arrays showing added, removed and modified keys with paths.
Paste JSON into both panels to see the diff.
Why use our JSON Diff?
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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Side-by-side comparison of two JSON documents with structural highlighting to spot differences instantly.
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OpenJSON Parser
Parse JSON strings into structured objects with instant syntax errors, a live tree view and copyable JSON paths.
OpenJSON Pretty Print
Pretty-print any JSON payload with 2, 4 or tab indentation. Beautify, validate and copy in one click.
OpenJSON Schema Validator
Validate JSON documents against a JSON Schema (draft-07 / 2019-09 / 2020-12) with precise error paths.
OpenJSON Stringify Online
Convert JSON into an escaped JavaScript string literal — ready to paste into code with correct quoting.
OpenRelated reading
Deep-dive guides that pair well with the JSON Diff.
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