JSON Formatter & Validator
Format, validate, and minify JSON data instantly in your browser.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data format used to store and exchange structured data between servers, APIs, and applications. It's the standard format behind most modern web APIs, configuration files, and NoSQL databases.
Why Format Your JSON?
Raw JSON returned from an API or database is often compressed onto a single line, making it unreadable. Formatting adds consistent indentation and line breaks so you can spot structure, missing commas, or mismatched brackets at a glance — while minifying does the opposite, stripping whitespace to reduce file size for production use.
Frequently Asked Questions
What's the difference between formatting and minifying?
Formatting adds indentation and line breaks for human readability. Minifying removes all unnecessary whitespace to reduce file size — useful when shipping JSON to production but not for debugging.
Is my JSON data uploaded to a server?
No. This tool runs entirely in your browser. Your data is never transmitted, logged, or stored anywhere — it stays on your device the entire time.
Why does my JSON show a validation error?
The most common causes are trailing commas, unescaped quotation marks inside strings, single quotes instead of double quotes, or a missing closing bracket. Our validator highlights the exact line and position where parsing fails.
Debug API Responses Faster
Formatted, validated JSON makes it far easier to spot the exact field or nesting level causing a bug when working with API responses, config files, or database exports — without needing to install a separate code editor or extension.