JSON Formatter

What is this tool?

A JSON formatter pretty-prints and validates JSON in the browser so you can read, debug, and copy a payload without changing what the data means.

JSON looks simple until a parser rejects it. The usual culprits are trailing commas, unquoted keys, single quotes, comments, and a missing brace that throws every later line off. A formatter that runs JSON.parse (or an equivalent) is the fastest way to see the first real error instead of guessing from syntax highlighting.

Pretty-print only inserts whitespace. Minified and formatted JSON with the same values should round-trip. If a tool silently drops keys or converts numbers to strings, it is not a formatter — it is mutating your document. This page indents with a spacing you choose and reports invalid input instead of inventing a “close enough” object.

Use it when an API example arrived as one long line, when a config file needs a review, or before you paste a body into curl. Keep secrets out of shared computers; the work happens in this tab and is not uploaded to run the widget.

How to use

1. Paste the JSON into the input box.
2. Choose indentation (2 or 4 spaces).
3. Read the formatted output, or the error if the document is invalid.
4. Copy or download the formatted JSON once it parses.

Example

{"name":"Ava","active":true,"roles":["admin","editor"],"count":2}

{
  "name": "Ava",
  "active": true,
  "roles": [
    "admin",
    "editor"
  ],
  "count": 2
}

Benefits

• Catch invalid JSON at the first parse error.
• Readable whitespace for reviews and diffs.
• Copy or download without a round-trip to a server.
• Runs entirely in the browser.

FAQ