JSON Formatter & Validator
Client-Side Only (Privacy Mode)JSON Formatter & Validator
Client-Side Only (Privacy Mode)Why Developers Trust Freetool over Other Formatters
Most online JSON formatters process your code on a backend server. This creates a massive security risk: if you accidentally paste JSON containing API Keys, Passwords, or User Data, that data is sent across the internet and potentially logged by a third party.
The Freetool Guarantee: This tool runs 100% Client-Side. Your code never leaves your browser. You can even disconnect your internet, and this tool will still validate and format your JSON perfectly.
JSON Beautifier
Converts messy, minified strings into clean, readable code with proper 4-space indentation. Essential for debugging API responses.
JSON Minify
Removes all unnecessary whitespace and newlines to compress your JSON. Perfect for reducing payload size before sending data to a server.
Error Validator
Instantly detects syntax errors like missing commas, unclosed brackets, or trailing commas. It highlights exactly where the code is broken.
Common Questions
Why is my JSON invalid?
The most common errors are: 1) Trailing commas at the end of a list (JSON doesn't allow this), 2) Using single quotes ' instead of double quotes ", or 3) Unclosed curly braces }.
What is the difference between JSON and XML?
JSON (JavaScript Object Notation) is lighter, faster to parse, and easier to read than XML. It is the modern standard for REST APIs and web data.
Why Developers Trust Freetool over Other Formatters
Most online JSON formatters process your code on a backend server. This creates a massive security risk: if you accidentally paste JSON containing API Keys, Passwords, or User Data, that data is sent across the internet and potentially logged by a third party.
The Freetool Guarantee: This tool runs 100% Client-Side. Your code never leaves your browser. You can even disconnect your internet, and this tool will still validate and format your JSON perfectly.
JSON Beautifier
Converts messy, minified strings into clean, readable code with proper 4-space indentation. Essential for debugging API responses.
JSON Minify
Removes all unnecessary whitespace and newlines to compress your JSON. Perfect for reducing payload size before sending data to a server.
Error Validator
Instantly detects syntax errors like missing commas, unclosed brackets, or trailing commas. It highlights exactly where the code is broken.
Common Questions
Why is my JSON invalid?
The most common errors are: 1) Trailing commas at the end of a list (JSON doesn't allow this), 2) Using single quotes ' instead of double quotes ", or 3) Unclosed curly braces }.
What is the difference between JSON and XML?
JSON (JavaScript Object Notation) is lighter, faster to parse, and easier to read than XML. It is the modern standard for REST APIs and web data.