DEV JSON
JSON Formatter and Validator
Paste JSON to validate its syntax and format it with two or four spaces. The data stays in your browser and is not uploaded.
✓ Free to use✓ Files stay on your device✓ No signup required
01
Format JSON
Paste a JSON value or document to validate it.
Enter JSON to check its syntax.
HOW IT WORKS
JSON Formatter and Validator in three steps
- Choose your input.Select a file, type your content or enter image dimensions.
- Adjust the options.Pick the format, size or quality that fits your task.
- Download or copy.Check the result, then save it to your device.
PRACTICAL NOTES
Validate and format JSON data
Paste a JSON value or document and select the indentation. The tool reports browser parser errors and formats valid JSON. It does not send your data to a server.
HELP & ANSWERS
Frequently asked questions
Does the formatter upload JSON?+
No. Formatting and validation run in your browser.
Can it format invalid JSON?+
No. The page reports a syntax error until the input is valid JSON.
Can I choose indentation?+
Yes. Choose two or four spaces for the formatted output.