JSON Formatter & Validator Online
Paste your JSON to format, validate, or minify it instantly online. Everything runs in your browser — no data is sent anywhere.
How to format JSON online
- Paste your JSON into the input area on the left.
- Click Format to beautify with 2-space indentation and syntax highlighting.
- Click Minify to remove all whitespace for compact output.
- Copy the result with one click or press Ctrl+Enter to format instantly.
Why use this JSON formatter?
- Instant validation — invalid JSON shows clear error messages with details.
- Syntax highlighting — keys, strings, numbers, and booleans are color-coded.
- Format & Minify — beautify for readability or compress for production.
- Auto-format on paste — paste JSON and it formats automatically.
- 100% client-side — your data never leaves your browser.
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