{ }JSON Formatter & Validator
Format, validate, and beautify JSON online. Find errors, minify, and visualize in tree view.
Input JSON
Output
1. Trailing Commas
❌ Invalid
{
"name": "John",
"age": 30,
}✅ Valid
{
"name": "John",
"age": 30
}2. Single Quotes Instead of Double
❌ Invalid
{
'name': 'John'
}✅ Valid
{
"name": "John"
}3. Missing Closing Brackets
❌ Invalid
{
"name": "John"✅ Valid
{
"name": "John"
}4. Unescaped Quotes in Strings
❌ Invalid
{
"text": "He said "hello""
}✅ Valid
{
"text": "He said \"hello\""
}5. Comments (Not Allowed)
❌ Invalid
{
// This is a comment
"name": "John"
}✅ Valid
{
"name": "John"
}🔌 API Development
Test and format API responses to ensure proper JSON structure.
⚙️ Configuration Files
Validate and beautify config.json files for your applications.
🐛 Debugging
Find syntax errors quickly with line-by-line validation.
📖 Code Review
Beautify minified JSON for easier code review and understanding.
📚 Learning
Understand JSON structure with tree view visualization.
🔄 Data Migration
Validate JSON data before importing into databases or systems.
📝 Documentation
Create clean, formatted JSON examples for technical documentation.
🎨 Data Visualization
Use tree view to explore complex nested data structures.
- Paste your JSON - Copy and paste JSON data into the input editor
- See validation results - Errors are shown immediately with line numbers
- Format or minify - Click Format to beautify or Minify to compress
- Choose view mode - Switch between formatted, minified, or tree view
- Copy or download - Copy to clipboard or download as .json file
✅ Real-time Validation
Instant syntax validation with detailed error messages and line numbers.
🎨 Format & Beautify
Make JSON readable with proper indentation (2 or 4 spaces).
📦 Minify
Remove whitespace to reduce file size for production use.
🌲 Tree View
Visualize nested structures with collapsible tree hierarchy.
🔤 Sort Keys
Alphabetically sort object keys for consistent formatting.
💾 Download
Save formatted or minified JSON as a .json file.
🔒 Privacy First
All processing happens in your browser. No server uploads.
⚡ Zero Dependencies
Uses native JSON API for lightning-fast performance.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is commonly used for transmitting data in web applications, storing configuration files, and exchanging data between servers and clients.
How do I validate JSON?
Simply paste your JSON into the input editor and it will automatically validate. Any syntax errors will be highlighted immediately with the exact line and column number where the error occurred, along with a description of what went wrong.
Is my JSON data saved or sent to a server?
No. All JSON processing happens entirely in your browser using JavaScript. Your data never leaves your device, is not sent to any server, and is not saved anywhere. This ensures complete privacy and security of your data.
What is the difference between formatting and minifying?
Formatting (beautifying) adds proper indentation and line breaks to make JSON human-readable and easier to understand. Minifying removes all whitespace and line breaks to make the file as small as possible, which is useful for reducing bandwidth when transmitting data.
What does "Sort Keys" do?
Sort Keys arranges all object properties alphabetically by key name throughout your entire JSON structure. This is useful for comparing JSON files, maintaining consistent formatting across your project, or making diffs easier to read in version control.
What is tree view?
Tree view displays your JSON data in a hierarchical, collapsible structure similar to a file explorer. You can expand and collapse objects and arrays to navigate complex nested data structures more easily. Values are color-coded by type (strings, numbers, booleans, null).