JSON Formatter & Validator

About this tool

This JSON Formatter lets you instantly beautify and validate any JSON data. It runs entirely in your browser — no data is ever sent to a server, making it safe for sensitive configs, API responses, and tokens.

Features:

• Syntax highlighting for keys, strings, numbers, booleans, and nulls
• Real-time validation with clear error messages
• Minify JSON for production use
• Configurable indent size (2 spaces, 4 spaces, or tabs)
• One-click copy and download
• 100% private — works offline once loaded

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