JSON Formatter
Pretty-print, minify and validate JSON. Copy or download the result.
What is Json Formatter
Paste raw or minified JSON to get a clean, indented, validated view — or compress pretty JSON back to a single line. Everything runs locally in the browser, so keys and payloads never leave your machine. Copy or download the result in one click.
How to use Json Formatter
- Paste JSON into the input area
- Choose format/beautify, minify or validate
- Copy or download the output
Frequently asked questions
Does this validate JSON syntax?
Yes — invalid JSON is flagged with the parse error so you can find the broken token, usually a missing comma or quote.
Is my JSON uploaded to a server?
No. Formatting and validation run entirely in your browser.
Why does valid-looking JSON fail to parse?
The parser is strict JSON.parse: comments, trailing commas, single quotes and unquoted keys are all rejected — those are JSON5/JS literals, not JSON.
Is Json Formatter free?
Json Formatter is completely free — open the page and use every feature with no hidden charges.
Do I need to download or install Json Formatter?
No download or installation is needed. It is an online tool that runs in the browser on your phone, tablet and computer.
Do I need an account to use Json Formatter?
No. Use the tool right away — no account or sign-in required.
Does Json Formatter work on mobile?
Yes. The page is fully responsive and works on phones, tablets and desktop browsers.