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JSON Formatter

Format, validate and minify JSON directly in your browser.

1 line

Result

Formatted output appears here.

About this tool

Formatting JSON adds line breaks and indentation so the structure becomes readable. Minifying does the opposite: it removes every byte that a parser does not need, which is what you want on the wire. Neither changes the data itself.

If the document is invalid, this tool tells you the exact line and column where parsing stopped, which is usually one character after the real mistake.

How to use it

  1. Paste your JSON into the input box.
  2. Choose an indentation width if you want something other than two spaces.
  3. Press Format to expand it, or Minify to strip whitespace.
  4. Copy or download the result.

Example

Input
{"name":"Islam","age":34}
Output
{
  "name": "Islam",
  "age": 34
}

FAQ

Is this JSON formatter free?
Yes, with no sign-up and no usage limits. The page is supported by ads, not by charging for the tool.
Is my JSON uploaded to a server?
No. Formatting runs in your browser using the built-in JSON parser. Nothing is sent anywhere, and this page has no analytics.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks so a human can read the document. Minifying removes all optional whitespace to make it as small as possible. The parsed data is identical either way.
Can I format very large JSON files?
Yes, up to whatever your browser tab can hold in memory — documents of several megabytes are fine. There is no server-side size limit because there is no server.
Why did my very large numbers change?
JSON numbers are parsed as IEEE-754 doubles, so integers beyond about 9 quadrillion lose precision. That is a property of JSON in every JavaScript environment, not of this tool. Send such values as strings if precision matters.
Why did the order of my keys change?
JavaScript objects list integer-like keys first, in ascending order, before other keys. Keys such as "1" and "2" therefore move ahead of named keys. Ordinary string keys keep their original order.