JSON Formatter
Format, validate, and beautify your JSON data instantly.
How to Use the JSON Formatter
Paste your JSON data into the input box and click Format JSON. The tool will validate your JSON and display a beautifully formatted version with proper indentation. If your JSON is invalid, you will see an error message with details about what went wrong.
What is JSON Used For?
JSON is the most popular data format for APIs, configuration files, and data storage. It is used by virtually every modern web application to exchange data between client and server. Common use cases include REST API responses, application settings, and NoSQL database documents.
JSON Syntax Rules
- Data is in key/value pairs
- Keys must be strings in double quotes
- Values can be strings, numbers, booleans, null, arrays, or objects
- Arrays use square brackets
- Objects use curly braces
- No trailing commas allowed
Common JSON Errors
- Trailing commas: Remove commas after the last item in arrays/objects
- Single quotes: JSON requires double quotes for strings
- Unquoted keys: Object keys must always be quoted
- Comments: JSON does not support comments
- Undefined values: Use null instead of undefined
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used for storing and transporting data. It's easy for humans to read and write, and easy for machines to parse and generate.
Why format JSON?
Formatted (pretty-printed) JSON is easier to read, debug, and understand. It adds proper indentation and line breaks to make the data structure visually clear.
Is my data secure?
Yes, all processing happens in your browser. Your JSON data is never sent to our servers, ensuring complete privacy and security.
Can I minify JSON with this tool?
Currently, this tool focuses on formatting and validation. You can manually remove whitespace, or we may add a minify feature in the future.