Pure Client Tools / JSON Formatter

JSON Formatter & Validator

Paste your JSON to beautify, minify, or validate it instantly. Everything runs in your browser.

Input
Output
Formatted JSON will appear here...

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. JSON is the most common format for APIs and configuration files in modern web development. Use this free JSON formatter to beautify minified JSON, validate your data structure, or compress JSON for production use.

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Working with JSON Web Tokens? You can decode and verify them in your browser with our JWT Decoder, or compare two JSON payloads using our Diff Checker.

❓ Frequently Asked Questions

Q. Is my sensitive JSON sent to any remote server?

No. Pure Client Tools processes 100% of your JSON data locally inside your browser using native JavaScript parsing. Zero bytes ever leave your machine.

Q. Can this tool format large or minified JSON files?

Yes. It can parse and pretty-print large JSON files of several megabytes with zero network latency, custom indentation (2 or 4 spaces), and real-time structural validation.

Q. How does the JSON validator highlight syntax errors?

The validator performs rigorous syntax checking conforming to RFC 8259, highlighting the exact line, column position, and character sequence where the syntax error occurred.