JSON Formatter & Validator
Input JSON
Output
Frequently Asked Questions
Is the JSON Formatter free to use?
Yes, completely free. No signup, no account, no hidden charges.
Is my JSON data uploaded to any server?
No. All formatting and validation happens entirely in your browser using JavaScript. Your JSON data never leaves your device.
What does JSON validation check?
The validator checks that your JSON is syntactically correct — properly matched braces and brackets, correctly quoted keys, valid value types, and no trailing commas. It shows the exact line and character where an error occurs.
What is the difference between formatting and minifying JSON?
Formatting (beautifying) adds indentation and line breaks to make JSON human-readable. Minifying removes all whitespace to produce the smallest possible JSON string — useful for API responses and storage.
What is the maximum JSON size I can format?
The tool handles JSON up to several megabytes in size. Very large JSON files (10MB+) may be slow to process depending on your device.
Can I use this to format JSON API responses?
Yes. Paste any raw JSON from an API response, log file, or configuration file and the formatter will instantly make it readable with proper indentation.
How to Use JSON Formatter & Validator
Paste your raw or minified JSON into the input area — it can be from an API response, config file, or any JSON source.
Click Format to beautify the JSON with 2-space indentation, or click Minify to compress it into a single line.
If your JSON has errors, the validator highlights the exact location of the problem with a clear error message.
Click Copy to clipboard to copy the formatted or minified JSON, ready to paste into your code editor or API tool.