JSON Formatter, Validator, Compare & Analyzer
Format, validate, compare, inspect, and minify JSON locally in the browser with deterministic output, diff reporting, and clear validation feedback.
Your input is processed locally in your browser whenever possible.
What does this tool do?
Format, validate, minify, compare, and inspect JSON directly in the browser without server-side processing.
How to use it
Paste your primary JSON, optionally add a comparison JSON document, then format, validate, minify, compare, copy, download, or count records locally in the browser.
Supported functionality
JSON parsing, tolerant invalid-JSON formatting, pretty-print formatting, minification, syntax validation, line-level error highlighting, JSON comparison, deterministic diff summaries, copy/download actions, record counting, and browser-local sample payload analysis.
Limitations
This tool validates JSON syntax and compares structural/value differences only. It does not infer schema compliance, enforce custom business rules, or auto-correct malformed JSON into guaranteed valid output.
Frequently Asked Questions
The tool runs entirely in the browser, so your data stays on the page unless you intentionally copy or download it.