JSON Cleaner

JSON Cleaner - Clean and Format JSON Online

Our free online JSON Cleaner tool helps you clean, format, and validate JSON data instantly. Whether your JSON has unnecessary whitespace, comments, trailing commas, or formatting issues, this tool will clean it up and produce properly formatted, valid JSON. Perfect for developers, data analysts, and anyone working with JSON data.

What is JSON Cleaning?

JSON cleaning is the process of removing unnecessary elements from JSON code and formatting it properly. This includes removing comments (which aren't part of the JSON standard), fixing trailing commas, normalizing whitespace, and ensuring the JSON is valid and properly formatted. Clean JSON is easier to read, validate, and process.

Key Features

• Remove Comments: Automatically removes single-line (//) and multi-line (/* */) comments
• Fix Trailing Commas: Removes trailing commas before closing brackets and braces
• Format JSON: Beautifies JSON with customizable indentation (1-8 spaces)
• Minify JSON: Option to compress JSON by removing all whitespace
• Syntax Validation: Validates JSON and provides clear error messages
• Real-time Processing: See cleaned results instantly as you type
• File Upload: Upload JSON files directly from your device
• Copy & Download: Easy copying and downloading of cleaned JSON
• Privacy-focused: All processing happens in your browser

How to Use the JSON Cleaner

1. Input JSON: Paste your JSON code into the input area or upload a JSON file
2. Configure Options:
   • Enable "Remove Comments" to strip out comment lines
   • Enable "Minify JSON" to compress the output
   • Set indentation size (1-8 spaces) if formatting
3. View Results: The cleaned JSON appears automatically in the output area
4. Copy or Download: Copy the cleaned JSON or download it as a file

What Gets Cleaned?

The JSON Cleaner performs the following operations:

• Removes Comments: Strips out single-line comments (//) and multi-line comments (/* */)
• Fixes Trailing Commas: Removes trailing commas before closing brackets and braces
• Normalizes Whitespace: Removes unnecessary whitespace and formats consistently
• Validates Structure: Ensures the JSON is valid and properly structured
• Formats Output: Applies consistent indentation and formatting

Example: Cleaning JSON

{
  "name": "John Doe",
  "age": 30,
  // This is a comment
  "city": "New York",
  "hobbies": ["reading", "gaming",],  // trailing comma
  "isActive": true,
}

{
  "name": "John Doe",
  "age": 30,
  "city": "New York",
  "hobbies": ["reading", "gaming"],
  "isActive": true
}

Common Use Cases

• API Development: Clean JSON responses and requests
• Configuration Files: Format JSON configuration files
• Data Processing: Clean JSON data before processing
• Code Review: Standardize JSON formatting in code reviews
• Documentation: Clean JSON examples for documentation
• Debugging: Fix malformed JSON that causes parsing errors
• Data Migration: Clean JSON before importing into databases
• Learning: Understand proper JSON formatting

JSON Cleaning Best Practices

• Remove Comments: JSON doesn't officially support comments, so remove them before processing
• Fix Trailing Commas: Trailing commas cause parsing errors in strict JSON parsers
• Consistent Formatting: Use consistent indentation (2 or 4 spaces) throughout
• Validate First: Always validate JSON before cleaning to catch structural errors
• Minify for Production: Use minified JSON in production to reduce file size
• Format for Development: Use formatted JSON during development for readability

Differences from JSON Formatter

While both tools format JSON, the JSON Cleaner specifically focuses on:

• Removing Invalid Elements: Comments and trailing commas that aren't valid JSON
• Fixing Common Issues: Automatically fixes formatting problems
• Cleaning Workflow: Designed for cleaning messy or improperly formatted JSON

The JSON Formatter focuses more on beautifying and organizing already-valid JSON, while the JSON Cleaner fixes invalid JSON and removes non-standard elements.