What happens if JSON is invalid?

The tool shows the parser error message so you can fix syntax issues like trailing commas or missing quotes.

Yes. Use Minify to remove whitespace for compact payloads.

JSON Formatter & Validator

Free online JSON formatter, validator, and minifier with clear errors. Pretty-print API responses in your browser.

Processed locally in your browser — nothing is uploaded.

Input

Output

{
  "name": "DevTools",
  "tools": 24,
  "private": true,
  "nested": {
    "ok": true
  }
}

Loading tool…

About this tool

Pretty-print, minify, and validate JSON with clear error messages. Ideal for debugging API responses and config files—runs entirely offline in your browser.

Frequently asked questions

What happens if JSON is invalid?: The tool shows the parser error message so you can fix syntax issues like trailing commas or missing quotes.
Can I minify JSON?: Yes. Use Minify to remove whitespace for compact payloads.