Format & minify
Beautify with indentation or compress to a single line. Customizable indent size for reading or production.
Runs entirely in your browser — your data never leaves the device. Format, minify, validate, and explore JSON with real-time results, safely and efficiently.
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.
Our free JSON formatter helps you beautify minified JSON, fix readability issues, and explore nested structures with syntax highlighting. Paste raw JSON and get instant, properly indented output — all processed locally without uploading data.
{"status":"ok","data":{"id":1,"name":"Alice","roles":["admin","editor"]}}{"database":{"host":"localhost","port":5432,"ssl":true},"cache":{"ttl":3600}}A JSON formatter (also called a JSON beautifier) adds indentation and line breaks to minified JSON, making it human-readable while preserving the original data structure.
Paste your JSON into the input area. The formatter automatically validates syntax and displays prettified output with your chosen indent size.
Formatting adds whitespace for readability. Minifying removes all unnecessary whitespace to reduce file size for production transmission.
Yes. JSON Toolbox processes everything in your browser. No data is uploaded to any server.
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.