JSON Formatter & Validator Online — Free Tool
Our free JSON formatter helps developers and analysts clean up messy JSON data in seconds. Paste raw JSON from APIs, logs, or config files and get properly indented, human-readable output. This tool runs entirely in your browser — nothing is sent to a server — so your data stays private. Whether you need to format JSON online for debugging, documentation, or code review, this formatter handles nested objects, arrays, and unicode characters with ease.
How to use
- Paste your raw JSON into the input box.
- Click Format to beautify with proper indentation.
- Copy the formatted result or download it as a file.
Frequently Asked Questions
What is JSON formatting?▼
JSON formatting (also called pretty-printing) adds indentation and line breaks to JSON data, making it easier to read and debug.
Is this tool safe?▼
Yes. All processing happens locally in your browser. Your JSON is never uploaded to any server.
Can I format large JSON files?▼
Yes, for most practical sizes. Very large files (10MB+) may slow down your browser depending on your device.