JSON Formatter
Format and validate JSON data
The JSON Formatter automatically indents and validates JSON data in real time, making it easy to read and debug. JSON (JavaScript Object Notation) is the standard data interchange format for web APIs, configuration files, and NoSQL databases. Whether you're inspecting an API response or editing a config file, properly formatted JSON saves significant debugging time for frontend developers, backend engineers, and data analysts alike.
๐ How to Use
- Paste your JSON data in the input area
- Select indentation size (2 or 4 spaces)
- Enable 'Sort Keys' option if needed
- Formatted result appears automatically on the right
- Click the copy button to copy the result
โจ Features
- โReal-time JSON validation
- โPretty print with indentation
- โAlphabetical key sorting option
- โSyntax error location display
- โOne-click copy functionality
๐ก Use Cases
- โขFrontend Developer: Format minified API responses to quickly understand nested data structures and locate specific fields.
- โขBackend Developer: Validate request and response payloads during REST API development to catch missing fields or type errors.
- โขQA Engineer: Compare expected vs. actual JSON responses during integration testing to identify discrepancies.
- โขData Analyst: Clean up scraped or exported JSON datasets to identify relevant fields before processing.
- โขStudent: Learn JSON syntax with instant error feedback that highlights exactly where formatting issues occur.
- โขDevOps Engineer: Validate and format CI/CD configuration files like package.json, tsconfig.json, or Terraform state files.
๐ฏ Tips
- โธPaste your JSON with Ctrl+V and formatting starts automatically โ no need to click any buttons.
- โธEnable 'Sort Keys' when comparing two JSON objects to normalize key order and spot differences instantly.
- โธTrailing commas after the last item cause parsing errors. Check the error message for the exact line number.
- โธUse 2-space indent for deeply nested JSON to fit more content on screen without horizontal scrolling.
- โธIf your JSON contains escaped strings or HTML entities, format it first, then inspect the values for correctness.
โ FAQ
Q. Why does it say my JSON is invalid?
A. Make sure you're using double quotes ("). JSON doesn't support single quotes (').
Q. Does it support Unicode characters?
A. Yes, this tool fully supports UTF-8 encoding including all Unicode characters.
Q. Can it handle large JSON files?
A. Yes, it can process files within browser memory limits. Very large files may take longer to load.
Q. What's the difference between JSON and a JavaScript object?
A. JSON requires all keys to be double-quoted strings and doesn't support functions, undefined, or comments. JavaScript object literals are more flexible. JSON is strictly a data interchange format, while JS objects are runtime values.
Q. Should I use 2-space or 4-space indentation?
A. It depends on your team's convention. Frontend projects commonly use 2 spaces, while 4 spaces work well for shallow config files. Choose whichever maximizes readability for your use case.
Q. Can I minify formatted JSON back to one line?
A. This tool focuses on formatting. To minify JSON, you would remove all whitespace and line breaks. Consider using a dedicated JSON minifier for that purpose.