JSON Formatter & Validator
Paste JSON to format, minify, and validate it instantly. Everything runs locally in your browser, so private API responses and config files stay on your machine.
Clean up JSON without uploading it
API responses, app config, and webhook payloads often arrive as dense one-line JSON. This formatter turns them into readable, indented output and shows parser errors when something is broken.
Because the tool uses your browser's built-in JSON parser, the work happens on your device. That makes it a safer choice for development payloads, client data, and internal configuration snippets.
Frequently Asked Questions
Is this JSON formatter private?
Yes. Parsing, formatting, minifying, and validation all happen locally in your browser. Your JSON is never uploaded or stored.
What does the validator check?
It checks whether the input is valid JSON according to the browser JSON parser, then shows the exact error message if parsing fails.
Can I minify JSON too?
Yes. Use Format for readable indentation or Minify to remove unnecessary spaces and line breaks.
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