Home / JSON Formatter

JSON Formatter & Validator

Paste JSON, format it, or catch the error that's breaking it.

Messy, minified, or hard-to-read JSON is a daily annoyance for developers — this formats and validates JSON instantly, catching syntax errors and producing clean, indented output for debugging API responses or config files.

How it works

  1. Paste your JSONDrop in JSON that’s messy, minified, or you’re just not sure is valid.
  2. Format or minifyFormat pretty-prints it with indentation; Minify strips it down to the smallest valid form.
  3. Copy the resultAny syntax error is called out immediately, with a description.

Good to know

  • Uses the browser's own built-in JSON parser, so error messages match what your code would actually throw
  • Format output uses 2-space indentation
  • Comments and trailing commas aren't valid JSON and will be flagged as errors, even though some tools tolerate them
  • No size limit beyond what your browser's memory can hold

FAQ

Is my JSON uploaded anywhere?

No — formatting and validation both happen locally in your browser using the built-in JSON parser. Nothing is sent anywhere.

What does "minify" do?

It removes all whitespace and line breaks, producing the smallest valid version of the same JSON — useful for production config files.

Does this work on Mac, Windows, or my phone?

Yes — it runs in any modern browser on Mac, Windows, Chromebook, iPhone, or Android. No app or software to install.