JSON Formatter & Validator
Format, validate and beautify your JSON data online.
How to Use
Paste your raw JSON into the input area and the tool will instantly format, validate, and beautify it. You can adjust the indentation level (2 or 4 spaces, or tabs) and collapse or expand nested objects. If your JSON contains syntax errors, the validator will highlight the exact line and character where the problem occurs.
Common Use Cases
- Debugging API responses by pretty-printing minified JSON payloads
- Validating JSON configuration files before deploying to production
- Cleaning up hand-edited JSON that may have trailing commas or missing quotes
- Quickly inspecting webhook payloads during integration development
Frequently Asked Questions
Can this tool fix invalid JSON automatically?
The formatter highlights syntax errors and tells you where they are, but it does not auto-correct invalid JSON. You need to fix issues like missing commas, unquoted keys, or trailing commas manually.
Is there a size limit for the JSON I can format?
The tool runs entirely in your browser, so performance depends on your device. Files up to a few megabytes typically format without issues; very large files may cause the browser tab to slow down.
Does my JSON data get sent to a server?
No. All formatting and validation happens locally in your browser. Your data never leaves your machine.