JSON Formatter
Format and validate JSON locally in your browser.
{
"hello": "world"
}How this tool helps
Format, validate and inspect JSON directly in your browser. Invalid JSON returns an error so you can correct syntax before copying the formatted output.
- Use formatting to make nested data easier to read.
- Validate JSON before sending it to an API or configuration file.
- Your pasted JSON stays in the browser.
Worked example: Format a compact JSON object
- Input: {"name":"Asha","active":true,"scores":[8,9]}
- Choose the indentation setting
- Run format or validate
The formatter displays the same JSON data with readable indentation and reports a syntax error if the input is invalid.
Formatting changes whitespace, not the underlying data. Do not paste secrets or production credentials into shared devices.
Frequently asked questions
Is my JSON uploaded?
No. This formatter is designed to process the text locally in your browser.
What causes invalid JSON?
Common causes include missing quotes, trailing commas, mismatched brackets and invalid escape sequences.
Can I change indentation?
Yes. The formatter supports configurable indentation.
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Your inputs stay in your browser. No account or upload is required.