Security Note

No data is stored. All JSON formatting and validation happens in-memory. Use this free online JSON formatter tool safely for development and testing purposes.

JSON Formatter & Validator

Pretty-print, minify, and validate JSON instantly
About JSON Formatter

This free JSON formatter and validator tool helps developers quickly format, minify, and validate JSON data. Perfect for debugging APIs and working with structured data.

Features:
  • ? Pretty-print JSON
  • ? Minify JSON
  • ? Validate JSON syntax
  • ? Copy formatted output
  • ? Client-side instant formatting
  • ? Secure - no storage
Tip: Use the client buttons for instant formatting without a server round trip.
Common JSON Issues:
  • Missing commas between properties
  • Trailing commas at end of objects/arrays
  • Unquoted property names
  • Invalid escape sequences
About This JSON Formatting Tool

This free online JSON formatter supports both pretty-printing (with indentation) and minification for compact transport. It validates JSON structure and reports parsing errors with helpful messages.

Ideal Use Cases:
  • ?? Debugging REST API responses
  • ?? Cleaning up messy JSON
  • ?? Minimizing payload size
  • ?? Validating before importing
Developer Friendly:
  • ? Fast processing
  • ?? No data retention
  • ?? Works in any browser
  • ?? Optimized for productivity

JSON (JavaScript Object Notation) is a lightweight data-interchange format used across APIs and web applications. Proper formatting improves readability and prevents syntax errors.