JSON Formatter

Awaiting input
Indent
Input
Raw JSON
0 ln0 ch0 B
Formatted
2-space indent
0 ln0 ch0 B
Output appears here as soon as you start typing valid JSON.

A fast, free JSON formatter and validator

Paste raw JSON on the left and our formatter instantly produces a beautified, syntax-highlighted version on the right — with line numbers, live validation and human-readable parse errors. Switch between 2-space, 4-space or tab indentation, minify back to a single line, copy to clipboard, or download as a .json file.

Everything runs locally in your browser. Your JSON is never uploaded or stored, so it's safe for sensitive payloads, API tokens, internal schemas and production data.

  • Prettify and validate JSON
  • Minify back to one line
  • Syntax highlighting + line numbers
  • Configurable indentation
  • Copy, download, and upload
  • 100% client-side & free

Frequently asked questions

What is this JSON formatter?

It is a free online JSON formatter that prettifies, validates and minifies JSON. Paste any JSON on the left and you get a clean, syntax-highlighted version on the right with line numbers and error reporting.

Is my JSON data safe?

Yes. The tool runs entirely in your browser — your JSON never leaves your device or hits any server. It also works offline once loaded.

How do I beautify minified JSON?

Paste the minified JSON into the input panel. The formatted version is generated automatically with the indent size you choose (2 spaces, 4 spaces, or tab).

How do I minify JSON?

Click the Minify button in the toolbar. The input is replaced with a single-line, whitespace-free version that you can copy or download.

Why am I getting a parse error?

JSON requires double-quoted keys and strings, no trailing commas, and no comments. The error panel shows the line and column where parsing failed, which usually points right at the issue.

Can I upload or download JSON files?

Yes. Use the Upload button to load a .json file from disk, or Download to save the formatted output as formatted.json.

Is the JSON formatter free?

Yes, it is completely free, with no signup, no rate limits, and no ads.