Paste JSON to format, validate, and explore. Syntax highlighting, tree view, error detection with line numbers.

Quick Examples

🚀

API Response

Typical REST API response with nested data

⚙️

Config File

Package.json-style configuration

📑

Deeply Nested

Complex object with arrays and nesting

⚠️

Invalid JSON

Test error detection and reporting

Features

🎨

Syntax Highlighting

Color-coded strings, numbers, booleans, nulls, and keys for easy reading.

📊

JSON Statistics

Instant metrics: key count, depth, arrays, type breakdown, byte size.

🌳

Tree View

Collapsible tree explorer. Click to expand/collapse nested objects and arrays.

⚠️

Error Detection

Precise error messages with position info. Know exactly where your JSON breaks.

📦

Minify

Compress JSON to a single line. Remove all whitespace for production use.

🔒

100% Private

Everything runs in your browser. No data is sent to any server, ever.

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FAQ

Is this JSON formatter free?

Yes, completely free with no limits. No signup, no ads, no data collection. It runs entirely in your browser using JavaScript.

Is my JSON data safe?

Your data never leaves your browser. All formatting, validation, and analysis happens client-side. No server requests are made. You can verify this in your browser's Network tab.

What's the maximum JSON size supported?

There's no artificial limit. The tool handles files up to several megabytes comfortably. For very large files (10MB+), the tree view may be slow but formatting and validation will still work.

Does it support JSON5 or JSONC (JSON with comments)?

This tool validates strict JSON per RFC 8259. JSON5, JSONC, and trailing commas are not valid JSON and will be flagged as errors. Use a dedicated JSON5 parser for those formats.

Can I format JSON from an API response?

Yes! Paste any API response directly. The formatter handles escaped strings, Unicode, nested objects, and arrays of any complexity. Try our API documentation to test with real API responses.

JSON Formatter & Validator

JSON Syntax Error