What happens if my JSON is invalid?

The tool shows the exact parser error message, such as an unexpected token or unterminated string, so you can find and fix the problem quickly.

Can I minify JSON instead of pretty-printing it?

Yes. Switch the output option to Minify to collapse the JSON onto a single line with no extra whitespace.

No. Formatting and validation happen entirely in your browser using JavaScript. Nothing is sent to a server.

Paste JSON to pretty-print, minify, or validate it instantly.

Input JSON

Output

{
  "name": "Ada Lovelace",
  "born": 1815,
  "tags": [
    "mathematician",
    "writer"
  ],
  "active": true
}

Paste or type JSON into the left panel. The right panel shows the formatted result instantly, or a clear error message if the JSON is invalid.

Choose 2-space or 4-space indentation for readability, or Minify to strip all whitespace for production use.

What happens if my JSON is invalid?: The tool shows the exact parser error message, such as an unexpected token or unterminated string, so you can find and fix the problem quickly.
Can I minify JSON instead of pretty-printing it?: Yes. Switch the output option to Minify to collapse the JSON onto a single line with no extra whitespace.
Is my JSON data uploaded anywhere?: No. Formatting and validation happen entirely in your browser using JavaScript. Nothing is sent to a server.