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Online JSON Formatter, Validator, Repair & Beautifier

A free online tool to format, validate, repair, beautify, and minify your JSON data. Instantly pretty-print JSON, auto-fix common syntax issues with a JSON repair engine, check for errors with a powerful linter, and compress it for production use.

Features

JSON Formatting
JSON Compression
JSON Validation
JSON Repair
+1 more features

Usage Examples

Basic Usage

JSON Tools Usage Example

Usage Steps:

  1. Select Mode - Click "Format", "Compress", "Validate", or "Repair" button
  2. Input JSON - Paste or enter raw/possibly broken JSON string in the input box
  3. Execute Processing - Click the corresponding processing button to run the selected mode
  4. View Results - Review the formatted, compressed, validated, or repaired JSON; copy results or download as a JSON file

Features:

  • JSON Formatting - Beautify JSON with indentation and line breaks for readability
  • JSON Compression - Remove whitespace to minimize file size for production
  • JSON Validation - Check syntax errors with detailed error messages and linting
  • JSON Repair - Automatically fix common JSON issues like missing quotes, trailing commas, and comments via a repair engine
  • File Statistics - Display original size, processed size, and compression ratio (where applicable)
  • One-click Copy - Quickly copy processing results to the clipboard
  • File Download - Save processed JSON as a file

Use Cases:

  • API Development - Format, validate, and repair API response data for easier debugging
  • Configuration Files - Beautify and fix JSON config files for better readability and maintenance
  • Data Transmission - Compress JSON data to reduce network transfer size
  • Error Recovery - Repair accidentally broken JSON pasted from logs, editors, or copy-paste operations
  • Code Review - Validate and repair JSON format to ensure data correctness before merging
  • Database Import - Validate and repair JSON data format before importing it into a database
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