JSON Formatter

Format, minify and validate JSON online. Everything runs locally in your browser — nothing is uploaded.

Runs in your browser

IndentCtrl/⌘Enterto format

Input1 line · 82 bytes

Output✓ Valid

{
  "tool": "json-formatter",
  "runsLocally": true,
  "units": [
    "lines",
    "bytes"
  ],
  "version": 1
}

How to use

Paste your JSON into the input pane. Click "Format" (or press Ctrl/⌘ + Enter) to pretty-print it with indentation, or "Minify" to strip all whitespace. If the JSON is invalid, the exact error is shown under the panes.

Is my data safe?

Yes. All processing happens in your browser. Your JSON is never sent to a server.