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, unreadable one-line JSON. This formatter turns that into cleanly indented output you can actually read and debug, and when the JSON is malformed it surfaces the exact parser error — the missing comma, the unclosed brace, the stray quote — so you can fix it fast instead of hunting line by line.
Formatting and minifying are two sides of the same tool: pretty-print while you're developing and debugging, then minify to strip every unnecessary space and line break before shipping, where smaller payloads mean faster transfers. The validator runs continuously as you type, so you always know whether what you have is parseable.
Private by design
Everything relies on your browser's built-in JSON engine, so nothing is uploaded or logged. That makes it a safe choice for real API responses, client data, tokens, and internal configuration you shouldn't be pasting into a random online service.
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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