JSON Formatter

Fast, accurate, and reliable

Input
101 B
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Output0 B
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JSON Formatter

Free online JSON formatter, validator, viewer, editor & beautifier. Format JSON, validate JSON syntax, beautify JSON code, minify JSON files instantly. Supports large files (30MB+), dark mode, error highlighting, and secure local processing.

jsonformatter.gg is a powerful, free online JSON formatter that helps developers format, validate, beautify, minify, and repair JSON data instantly. Our tool processes all data locally in your browser, ensuring complete privacy and security. With support for files up to 30MB+, real-time validation, error highlighting, and auto-fix capabilities, it's the perfect solution for API development, configuration management, and data analysis.

JSON Validator

The JSON Validator at jsonformatter.gg provides real-time syntax checking against RFC 8259 standards. It instantly identifies errors including missing commas, unclosed brackets, invalid characters, malformed structures, and type mismatches. Each error is highlighted with precise line and column numbers, making debugging fast and efficient. Unlike other validators, all processing happens locally in your browser, ensuring your sensitive data never leaves your device.

Key Validation Features

  • Real-time Syntax Checking: Validates JSON as you type or paste
  • RFC 8259 Compliance: Adheres to official JSON specification standards
  • Precise Error Reporting: Shows exact line and column numbers for errors
  • Common Error Detection: Catches missing/trailing commas, unclosed brackets, quote issues
  • Type Validation: Verifies correct data types (strings, numbers, booleans, arrays, objects)
  • Structure Validation: Ensures proper nesting and hierarchy
  • Character Encoding: Detects invalid UTF-8 characters and escape sequences

Features

Core Features :

Format & Beautify
  • •Smart Indentation: Configurable 2-space or 4-space indentation
  • •Line Break Optimization: Proper line breaks for readability
  • •Consistent Spacing: Uniform spacing throughout JSON structure
  • •Bracket Alignment: Properly aligned opening and closing brackets
  • •Array & Object Formatting: Clean formatting for nested structures
Validate & Check
  • •Real-time Validation: Instant syntax checking as you work
  • •Error Highlighting: Visual indicators for syntax errors
  • •Detailed Error Messages: Clear explanations of what went wrong
  • •Line Number Reference: Easy navigation to error locations
  • •RFC 8259 Compliance: Industry-standard validation
Minify & Compress
  • •Whitespace Removal: Eliminates all unnecessary spaces and line breaks
  • •File Size Reduction: Reduces JSON size by 30-60% on average
  • •Production-Ready Output: Optimized for web applications and APIs
  • •Fast Processing: Instant minification even for large files
  • •Preserves Data Integrity: No data loss during compression
Repair & Auto-Fix
  • •Missing Comma Detection: Automatically adds missing commas
  • •Trailing Comma Removal: Removes invalid trailing commas
  • •Quote Correction: Fixes single quotes to double quotes
  • •Bracket Matching: Closes unclosed brackets and braces
  • •Smart Error Recovery: Attempts to repair common syntax issues

Advanced Features :

Large File Support
  • •Handles JSON files up to 30MB+
  • •Streaming processing for massive datasets
  • •Performance optimization for quick processing
  • •Memory-efficient parsing algorithms
Privacy & Security
  • •100% Local Processing: No data sent to servers
  • •Client-Side Only: All operations in your browser
  • •No Data Storage: Nothing saved on our servers
  • •HTTPS Secure: Encrypted connection
  • •No Registration Required: Use anonymously
User Experience
  • •Dark Mode: Comfortable viewing in low-light environments
  • •Syntax Highlighting: Color-coded JSON elements
  • •Line Numbers: Easy reference and navigation
  • •Copy to Clipboard: One-click copying of formatted JSON
  • •Download Output: Save formatted JSON as a file
  • •Upload Files: Drag-and-drop or browse to upload
  • •Keyboard Shortcuts: Fast navigation and actions

Know more about JSON

What is JSON?JSON Full FormHow to Create JSON File?JSON Example with all data typesPython Pretty Print JSONRead JSON File Using PythonValidate JSON using PHPPython Load Json From File

Frequently Asked Questions