Format & minify
Beautify with indentation or compress to a single line. Customizable indent size for reading or production.
Compare two JSON documents and highlight additions, deletions, and modifications.
From formatting and validation to conversion and export — 10 essential tools in one page. No install, no sign-up, ready to use.
Beautify with indentation or compress to a single line. Customizable indent size for reading or production.
Detect JSON syntax errors with precise line/column numbers. Catch trailing commas, quote issues, and more.
Side-by-side comparison of two JSON documents with highlighted additions, deletions, and changes.
Browse complex JSON in a collapsible tree. Copy paths to quickly locate nested fields.
JSON ↔ YAML, JSON → XML, JSON → CSV / Excel — for config authoring and data export.
Debug JSONPath expressions online. Extract nested fields with one-click templates.
Built for anyone who works with JSON daily — debugging, configuration, testing, and data export.
Everything runs locally in your browser. Paste JSON and see results instantly — nothing is uploaded.
Pick the feature you need from the top navigation — format, validate, diff, convert, and more.
Paste JSON into the input area, or click Load sample to try each feature instantly.
Results appear in real time on the right. Copy or download — all processing stays local.
The JSON diff tool compares two JSON documents and highlights additions, deletions, and modifications with color-coded output. Perfect for reviewing API version changes, config drift, and test regression analysis.
Old: {"version":1,"user":"alice"}
New: {"version":2,"user":"alice","email":"a@example.com"}Old: {"timeout":30,"retries":3}
New: {"timeout":60,"retries":3,"cache":true}A JSON diff shows the differences between two JSON documents, highlighting added, removed, and changed values.
Paste each JSON into the two input panels and click Compare. Differences are highlighted automatically.
Green indicates additions, red indicates deletions, and yellow/orange indicates modified values.
Files up to 2 MB work well. Larger files may be slow; files over 10 MB are not supported.
JSON diff compares key-value structures natively, while XML diff must account for element order and attributes differently.
Yes. JSON Toolbox is completely free with no sign-up, no usage limits, and no hidden fees.
Your data never leaves your browser. All parsing, formatting, and conversion runs locally on your device — nothing is sent to any server.
All modern browsers including Chrome, Firefox, Safari, and Edge. No plugins or extensions required.
Files over 2 MB may feel slow; files over 10 MB are blocked. For very large payloads, use a local CLI tool instead.
Only standard JSON (RFC 8259) is supported. JSON5 features like comments and trailing commas are not accepted.