JSON Formatter & Validator {}

Free JSON Formatter and Validator

Format, validate, and explore JSON data with our free online JSON formatter. Paste your JSON, click Beautify for readable indentation, Minify for compact output, or Validate to check for errors. The tool features syntax highlighting, an interactive tree view, real-time error detection with line numbers, and one-click copy. No signup, no upload — all processing happens in your browser.

Features

• Beautify — Add proper indentation and line breaks for readability
• Minify — Remove whitespace to minimize file size
• Validate — Check JSON syntax with detailed error messages and line/column numbers
• Tree View — Interactive collapsible tree to explore nested JSON structures
• Syntax Highlighting — Color-coded keys, strings, numbers, booleans, and null
• Path Tracking — Click any tree node to see its JSON path
• Copy & Download — One-click copy to clipboard or download as .json file
• File Upload — Load .json files directly
• 100% Private — All processing happens locally in your browser

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write, and easy for machines to parse and generate. It's the standard format for APIs, configuration files, and data storage in modern web applications. JSON supports six data types: strings, numbers, booleans, null, objects (key-value pairs), and arrays (ordered lists).

Common Use Cases

• API debugging — Format API responses for readability
• Configuration files — Validate and beautify config.json, package.json, etc.
• Data exploration — Use tree view to navigate complex nested structures
• Error fixing — Identify syntax errors with exact line and column numbers
• Minification — Reduce JSON file size for faster network transfer
• Learning — Understand JSON structure with syntax highlighting and tree view

JSON Syntax Quick Reference

• Objects: {"key": "value"} — unordered key-value pairs
• Arrays: [1, 2, 3] — ordered lists
• Strings: "hello" — double-quoted UTF-8 text
• Numbers: 42 or 3.14 — integers or floats
• Booleans: true or false
• Null: null — represents no value

Privacy

Your JSON data is 100% private. All formatting, validation, and parsing happens locally in your browser using JavaScript. No data is ever sent to any server.

Frequently Asked Questions

What is JSON formatting? — Adding indentation and line breaks to make JSON readable.

Is it free? — Yes, completely free with no limits.

Can it validate? — Yes, with detailed error locations.

Is data private? — Yes, all processing is local.