JSON Formatter & Validator
Paste your JSON below to format, validate, or minify it instantly.
About JSON Formatter
JSON (JavaScript Object Notation) is a lightweight data-interchange format. This tool helps you beautify compressed JSON for readability, minify it to reduce file size, and validate it to catch syntax errors. All processing happens locally in your browser — your data is never sent to a server.
How to Use the JSON Formatter
Paste your raw or compressed JSON into the input field above.
Click Format / Beautify to add indentation and line breaks, or Minify to compress it.
Use Validate to check if your JSON is syntactically correct without reformatting it.
Click Copy to copy the formatted output to your clipboard.
Common Use Cases
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data format used to represent structured data. It is the most widely used format for exchanging data between web servers and browsers, and is natively supported by virtually every programming language.
What is the difference between formatting and minifying?
Formatting (beautifying) adds indentation and newlines to make JSON human-readable. Minifying removes all unnecessary whitespace to reduce file size — useful for production APIs where bandwidth matters. Both represent the exact same data structure.
What causes "Unexpected token" errors?
Common JSON errors include: trailing commas after the last element (not allowed in JSON), single quotes instead of double quotes, unquoted property keys, or missing commas between items. The validator will tell you exactly where the error occurs.
Is my JSON data safe?
Yes. All processing happens locally in your browser using JavaScript. Your JSON data is never uploaded to any server. You can safely paste confidential configuration files or API responses.
What is the difference between JSON and JavaScript objects?
JSON is a string format derived from JavaScript object syntax, but with stricter rules: all keys must be double-quoted strings, trailing commas are not allowed, and values must be strings, numbers, booleans, null, arrays, or objects. JavaScript objects are more flexible and exist in memory, not as text.