JSON Formatter

Format, minify, and validate JSON locally

🔐 Local processing

✅ Uses browser-native JSON.parse / JSON.stringify.

ℹ️ Large files may be slow. Keep single paste size within a few MB depending on device/browser.

About this tool

Paste messy API responses or config files and get readable JSON instantly. Uses native JSON.parse and JSON.stringify locally—your data never leaves your device.

How to use

  1. Paste your JSON into the Input JSON box.
  2. Choose indent: 2 spaces, 4 spaces, or Tab.
  3. Click Format to beautify, Minify to compress, or Validate only to check syntax.
  4. Click Copy result to use the output in your project.

Is my JSON uploaded to a server?

No. Parsing and formatting run entirely in your browser.

What happens if JSON is invalid?

The validator shows a syntax error message pointing to the problem—fix and retry.

Can I minify JSON for production?

Yes. Click Minify to remove whitespace and produce a compact one-line JSON string.

Is there a size limit?

Very large JSON (multi-MB) may be slow on low-memory devices—try smaller chunks if needed.

Does this support Unicode and emoji?

Yes. Valid UTF-8 JSON including emoji and non-Latin characters is supported.