JSON Formatter & Validator - Beautify JSON Online
Format, beautify, validate, and minify JSON data with syntax highlighting. Fix JSON errors instantly — 100% client-side, no data sent to server.
Frequently Asked Questions
What is JSON and why do I need to format it?
JSON (JavaScript Object Notation) is a lightweight data interchange format used by web APIs, configuration files, and databases. Formatting JSON makes it human-readable with proper indentation, making it easier to understand and debug complex data structures.
Is my JSON data safe when using this tool?
Yes, completely safe. All JSON processing happens 100% in your browser using JavaScript. Your data never leaves your device or gets sent to any server. You can verify this by checking your browser's network tab.
What does the Repair function do?
The Repair function attempts to fix common JSON syntax errors automatically, including: removing trailing commas, converting single quotes to double quotes, and adding quotes to unquoted object keys. It's useful for cleaning up hand-written or malformed JSON.
What's the difference between Code view and Tree view?
Code view shows the formatted JSON as syntax-highlighted text, ideal for copying or editing. Tree view displays JSON as an interactive hierarchical structure where you can expand/collapse nested objects and arrays, and click to copy JSON paths.
Can I export JSON to other formats?
Yes, you can export JSON to YAML format for configuration files, or to CSV format if your JSON contains an array of objects (useful for spreadsheet applications). Use the 'Export as' dropdown after formatting your JSON.
Code Examples
// Parse JSON string
const jsonString = '{"name": "John", "age": 30}';
const obj = JSON.parse(jsonString);
console.log(obj.name); // "John"
// Format JSON with indentation
const formatted = JSON.stringify(obj, null, 2);
console.log(formatted);
// {
// "name": "John",
// "age": 30
// }