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JSON Formatter & Base64 Tool

Format, minify and validate JSON, and encode or decode Base64 and URLs.

About JSON Formatter & Base64 Tool

Paste JSON to pretty-print it with clean indentation, shrink it to one line, or check whether it is valid, with a clear error message when it is not. The same tool encodes and decodes Base64 and URL-encoded text.

Everything happens in your browser, so private data is not uploaded.

How to use it

  1. Paste your JSON or text into the box.
  2. Click Format, Minify or Validate.
  3. Or choose a Base64 or URL option.
  4. Copy the result.

Frequently asked questions

Common causes are trailing commas, single quotes instead of double quotes or missing brackets. The message shows where the parser stopped.

No. Base64 is only an encoding and it does not protect data.

No. All processing happens in your browser.