Beautify, validate, minify, and explore JSON data structures in real-time. Interactive collapsible tree explorer, alphabetical key sorting, zero lag, and 100% client-side privacy.
JavaScript Object Notation (JSON) is the universal data interchange format powering modern REST APIs, GraphQL responses, NoSQL databases (MongoDB, DynamoDB), and application configuration files. Because JSON is designed to be both human-readable and machine-parsable, validating syntax errors and formatting indentation is an everyday task for software engineers.
However, formatting JSON on generic online sites presents significant security risks. Developers frequently copy and paste payloads containing production database records, private API tokens, customer credentials, and internal endpoints into online beautifiers. Our JSON Formatter & Validator runs 100% inside your browser's V8 JavaScript engine—no data ever leaves your computer.
| Common Error | Invalid JSON Example | Valid Corrected Syntax |
|---|---|---|
| Trailing Commas | {"items": [1, 2,],} |
{"items": [1, 2]} |
| Single Quotes | {'title': 'Book'} |
{"title": "Book"} |
| Unquoted Keys | {name: "Alice"} |
{"name": "Alice"} |
| Unescaped Control Chars | Raw newlines in string values | Use \n or \t |