Beautify, validate, or minify JSON with clear error messages
Free to use
•No account required
•Data stays in your browser
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Your data is processed locally in your browser.
What you can do
•Pretty-print with two-space indentation
•Minify to a single line
•Validate with human-readable errors
•Copy or download the result
How it works
1
Paste JSON
Paste or type JSON into the input.
2
Choose format
Pick Pretty or Minify.
3
Copy or download
Copy the result or download a .json file.
Common uses
•Clean API responses before sharing
•Minify JSON for compact payloads
•Spot syntax errors quickly
•Read a one-line config file
Frequently asked questions
What if my JSON is invalid?
The tool shows a readable error instead of crashing. The usual culprits are a trailing comma after the last item, single quotes instead of double quotes, an unquoted key, or an unclosed bracket.
How does it validate JSON?
Input is parsed with the browser’s own strict JSON parser, so anything that parses here is valid JSON by the specification — comments and trailing commas are rejected, just as they would be by an API.
Can I minify JSON here too?
Yes. Switch to Minify to collapse JSON to a single line after it validates. Beautify and minify are both on this page, so you can round-trip between them.
What indentation does Pretty use?
Two spaces per level, which is the common default for JSON files and API examples.
Is this JSON formatter really private?
Yes. Formatting happens in your browser with no network request, which matters when the payload contains access tokens, personal data, or an unreleased API response. Close the tab and the text is gone.
Is my input uploaded?
No. Conversion runs in your browser. Nothing is sent to a NeedAnyTool server for these tools.
