Beautify, minify, and validate JSON data with syntax highlighting. Detect errors, fix formatting issues, and convert between JSON formats instantly.
JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write, and easy for machines to parse and generate. It's the most commonly used format for APIs, configuration files, and data storage in modern web applications.
{}[]| Error | Cause | Fix |
|---|---|---|
| Unexpected token | Invalid character or structure | Check for missing quotes, brackets |
| Unterminated string | Missing closing quote | Ensure all strings have matching quotes |
| Trailing comma | Extra comma after last item | Remove comma before } or ] |
| Single quotes | JSON requires double quotes | Replace ' with " for keys and string values |
JSON is a text format that's a subset of JavaScript object syntax. Key differences: JSON requires double quotes for keys and strings, doesn't support undefined/functions/comments, and keys must be strings. JavaScript objects are more flexible.
Beautified (pretty-printed) JSON is much easier to read and debug. When working with APIs, configuration files, or data analysis, formatted JSON helps you quickly understand data structure and spot errors.