Best Free JSON Formatter & Validator Online 2025

Professional JSON formatter and validator tool. Format JSON, validate JSON syntax, beautify JSON code, fix JSON errors, and convert Python to JSON. The most comprehensive free JSON tool for developers, data analysts, and API testing. Works with malformed JSON, supports drag & drop, keyboard shortcuts, and AI-powered error correction.

JSON Formatting & Validation Features

  • Free online JSON formatter with instant formatting
  • JSON syntax validator with detailed error reporting
  • JSON beautifier and pretty printer
  • Fix broken and malformed JSON automatically
  • Python dictionary to JSON converter
  • JSON minifier and compressor
  • AI-powered JSON error correction
  • Upload JSON files with drag & drop
  • Download formatted JSON in multiple formats
  • Real-time JSON validation as you type
  • JSON schema validation and structure checking
  • JSON viewer with syntax highlighting

Why Choose Our JSON Tool?

Unlike other JSON formatters, our tool combines traditional JSON validation with AI-powered error correction. It handles not just standard JSON but also Python-like syntax, making it perfect for data scientists and Python developers. With features like drag & drop file upload, keyboard shortcuts, and export to multiple formats (YAML, CSV, XML, TOML), it's the most comprehensive JSON tool available for free.

Common JSON Issues We Fix

  • Missing quotes around object keys
  • Single quotes instead of double quotes
  • Python literals (True, False, None)
  • Trailing commas in objects and arrays
  • Unescaped special characters
  • Malformed nested structures
  • Syntax errors from copy-paste