JSON Formatter & Validator

How to Use the JSON Formatter

Step-by-Step Guide

1. Paste JSON: Copy your JSON and paste it into the left input panel
2. Validate: The tool automatically validates your JSON and shows status (Valid/Invalid)
3. Format: Click "Format" to pretty-print your JSON with proper indentation
4. Minify: Click "Minify" to remove all whitespace and compact your JSON
5. Copy Output: Click "Copy Output" to copy the formatted/minified JSON to clipboard
6. Sample JSON: Click "Sample JSON" to load an example JSON for testing
7. Clear: Click "Clear" to reset both input and output panels

Features

Format JSON

• Pretty-print with 2-space indentation
• Makes JSON human-readable and easy to understand
• Ideal for debugging and documentation

Minify JSON

• Remove all unnecessary whitespace
• Compact JSON to smallest size
• Perfect for production APIs and data transfer

Real-time Validation

• Instant syntax checking as you type
• Clear error messages with line information
• Color-coded status indicator (green = valid, red = invalid)

Developer-Friendly

• Monospace font for easy reading
• Syntax error details displayed
• Large text areas for complex JSON
• One-click copy to clipboard

Common Use Cases

API Development

• Format API responses for readability
• Validate JSON payloads before sending
• Debug malformed JSON from API calls
• Prepare JSON for documentation

Configuration Files

• Format package.json, tsconfig.json files
• Validate configuration syntax
• Clean up messy config files
• Prepare configs for version control

Data Processing

• Validate JSON data structures
• Format JSON exports from databases
• Clean up JSON data files
• Prepare JSON for import/export

Learning & Teaching

• Understand JSON structure
• Learn proper JSON syntax
• Create example JSON data
• Debug JSON parsing issues

JSON Syntax Rules

Valid JSON Requirements:

1. Must use double quotes for strings (not single quotes)
2. Property names must be in double quotes
3. No trailing commas in objects or arrays
4. Values can be: string, number, boolean, null, object, array
5. Numbers cannot have leading zeros (except 0 itself)
6. Cannot use comments (// or /* */)

Example Valid JSON:

{
  "name": "John Doe",
  "age": 30,
  "active": true,
  "address": null,
  "hobbies": ["reading", "coding"]
}

Common Errors:

• Single quotes instead of double quotes
• Missing commas between properties
• Trailing commas at end of objects/arrays
• Unquoted property names
• Comments in JSON (not allowed)

Tips for Best Results

1. Copy-Paste: Use Ctrl+C / Cmd+C to copy and Ctrl+V / Cmd+V to paste
2. Large Files: Tool handles large JSON files, but very large files (>1MB) may be slow
3. Error Messages: Read error messages carefully - they indicate the exact problem
4. Format First: Always format JSON before manually editing for better readability
5. Backup: Keep a backup of original JSON before making extensive edits