Developer Suite• Formatters & Parsers
JSON Formatter
Format, validate, and clean your JSON data easily.
Valid JSON
Input
Output
What is this tool?
The JSON Formatter and Validator is an essential developer tool that takes raw, messy, or minified JSON strings and transforms them into perfectly indented, human-readable data. It also instantly checks for syntax errors, missing commas, or trailing brackets.
How to format JSON
- Paste your raw JSON string into the Input editor on the left.
- Select your preferred indentation size (2, 4, or 8 spaces).
- Click the Auto-Format button to beautify the code.
- Use the Output editor to review or copy the valid JSON.
Key Features
- Instant client-side syntax validation
- Custom indentation (2, 4, 8 spaces)
- JSON minification for production use
- One-click copy to clipboard
Frequently Asked Questions
Is my JSON data sent to a server?
No. All formatting, validation, and parsing is done locally in your browser using standard JavaScript engines. No data is ever transmitted or saved.
Why is my JSON invalid?
Common JSON errors include trailing commas, missing double quotes around keys, or using single quotes instead of double quotes. The validator will highlight syntax errors automatically.
Privacy First
Processed 100% locally in your browser. No server storage or API uploads.