JSON Formatter and Validator
A tool to format, validate and optimize JSON data
Formatted JSON
Formatted JSON will appear here...
Enter JSON or upload a file
JSON format examples
Simple object
{
"name": "John",
"age": 30,
"city": "New York"
}Nested object
{
"person": {
"name": "John",
"contacts": {
"email": "john@example.com",
"phone": "+1234567890"
}
},
"isActive": true
}About JSON
What is JSON?
JSON (JavaScript Object Notation) is a lightweight and readable format for storing and transmitting data. It is widely used in modern web applications and APIs.
Key Features
- • Human-readable format
- • Language-independent standard
- • Small size and fast processing
- • Wide support
Usage Areas
- • API responses and requests
- • Configuration files
- • Database exports
- • Data transmission for web applications
Frequently asked questions
How does JSON formatter work?
Paste your JSON into the left panel and the formatted result appears on the right straight away. There is no button to press, and the parsing happens in your browser.
Is JSON formatter free?
Yes, our JSON formatter is completely free. No signup and no payment is required.
What JSON errors can be detected?
It detects syntax errors — a missing comma or colon, an unclosed bracket or quote, an unquoted property name — and shows the line and column where parsing stopped.
Can it handle large JSON files?
Yes. You can upload .json or .txt files up to 10 MB. Above 300 KB the output drops syntax colouring, but the full text is still shown.