Input JSON
Formatted Output
Formatted JSON will appear here
JSON Formatting Tips
- •Use proper indentation for better readability (2 or 4 spaces)
- •All keys must be enclosed in double quotes
- •String values must use double quotes, not single quotes
- •No trailing commas after the last element in arrays or objects
- •Use minification to reduce file size for production APIs
- •Sort keys alphabetically for consistent diffs and version control
Key Features
Smart Formatting
Automatically format JSON with customizable indentation (2 spaces, 4 spaces, or tabs). Choose between beautified or minified output.
Real-Time Validation
Instant validation as you type with detailed error messages showing exact line and column numbers for syntax errors.
Tree View Explorer
Navigate complex JSON structures with an interactive tree view. Expand and collapse nodes to explore nested data.
Syntax Highlighting
Color-coded syntax highlighting makes it easy to distinguish between keys, strings, numbers, booleans, and null values.
Statistics & Metrics
View detailed statistics including object count, array count, key count, maximum depth, and file size.
100% Private
All processing happens in your browser. Your JSON data never leaves your device - no server uploads or logging.
Understanding JSON Format
JSON (JavaScript Object Notation) is the most widely used data interchange format on the web. It is lightweight, human-readable, and easy for machines to parse.
Data Types
- String:Text enclosed in double quotes -
"hello" - Number:Integer or decimal -
42,3.14 - Boolean:
trueorfalse - Null:
null- represents no value - Array:Ordered list -
[1, 2, 3] - Object:Key-value pairs -
{"key": "value"}
JSON Rules
- ✓Keys must be strings in double quotes
- ✓String values use double quotes only
- ✓Commas separate elements in arrays/objects
- ✗No trailing commas after last element
- ✗No comments allowed in JSON
- ✗No single quotes for strings
- ✗No unquoted keys in objects
Example: Valid JSON
{
"name": "John Doe",
"age": 30,
"email": "[email protected]",
"isActive": true,
"address": {
"street": "123 Main St",
"city": "San Francisco",
"state": "CA"
},
"hobbies": ["reading", "hiking", "photography"],
"metadata": null
}Common JSON Errors
❌ Invalid JSON
Missing Comma
{
"name": "John"
"age": 30 ← Missing comma
}Trailing Comma
{
"name": "John",
"age": 30, ← Trailing comma
}Single Quotes
{
'name': 'John' ← Must use double quotes
}✓ Valid JSON
Proper Commas
{
"name": "John",
"age": 30
}No Trailing Comma
{
"name": "John",
"age": 30
}Double Quotes
{
"name": "John"
}Common Use Cases
API Debugging
Format API responses to identify issues, validate structure, and understand nested data relationships.
Configuration Files
Validate and format JSON configuration files for applications, ensuring proper syntax before deployment.
Data Analysis
Explore complex data structures with tree view, calculate statistics, and understand data hierarchy.
Code Reviews
Sort keys alphabetically for consistent formatting and easier diff comparison in version control.
Minification
Reduce JSON file size by removing whitespace for production APIs and optimized data transfer.
Documentation
Format JSON examples for technical documentation, tutorials, and API guides with proper indentation.
Frequently Asked Questions
Find answers to common questions
Need Help with API Development?
Our development team can help you design, build, and optimize APIs with proper JSON schema validation, documentation, and best practices.