Client-side only · JSON formatting & validation

JSON Formatter & Validator

A lightweight utility for formatting, minifying, and validating JSON directly in your browser. Nothing is sent to a server, making it safe for API responses, logs, and other sensitive data.

Powered by JSON.parse / JSON.stringify

Paste JSON and use the buttons to quickly format or validate it.

All formatting, minifying, and validation runs entirely in your browser. Pasted JSON is never sent to any server.

1. A safe formatter for developers

This tool is ideal when you need to pretty-print or inspect JSON that may contain sensitive data, such as API responses or log payloads.

All processing happens locally in your browser using JavaScript only, so there is no risk of data leakage to external servers.

2. Key features

  • Format: Pretty-prints messy JSON with consistent indentation for easier reading.
  • Minify: Removes whitespace and newlines to reduce payload size for transport or storage.
  • Validate: Quickly detects JSON syntax errors via parsing and helps you identify where corrections are needed.