JSON Beautifier

About this tool

Paste minified or messy JSON and get it back indented and readable, with a choice of 2 or 4 spaces. Formatting happens in your browser using the standard JSON parser, so the data is never uploaded. Because the text is fully parsed first, the tool doubles as a quick syntax check: if the JSON is invalid you get the parser's error message instead of output. Formatting changes only whitespace — keys, values and their order stay the same.

How to use it

1. Paste your JSON into the input box.
2. Choose 2 or 4 spaces for the indent.
3. Read the formatted result below, or fix the error message if the JSON is invalid.
4. Copy the output.

Example

Minified input, 2-space indent:

{"name":"John","age":28,"tags":["a","b"]}

{
  "name": "John",
  "age": 28,
  "tags": [
    "a",
    "b"
  ]
}

Common problems

Trailing comma

JSON does not allow a comma after the last item in an object or array. Remove it.

Single quotes or unquoted keys

Keys and strings must use double quotes. {name: 'x'} is JavaScript, not JSON.

Comments in the JSON

Standard JSON has no comments. Remove // and /* */ before formatting.

Unexpected token at a position

The error shows where parsing failed; look just before that position for a missing comma, quote or bracket.