Development

JSON Formatter and Validator

Format, validate or minify JSON without sending it to a server. Paste your data, choose an indentation style and copy or download the result.

01

Paste and process JSON

Use any valid JSON value, from a complete object to a single boolean or number.

Waiting for JSON
02

Input

0 characters0 bytes

Standard JSON uses double-quoted keys and strings, with no comments or trailing commas.

03Process

Applied when formatting. Minified output has no indentation.

04

Output

0 characters0 bytes

Copy the latest result or save it as a local .json file.

Valid values

JSON does not have to start with an object

Objects and arrays are common, but a top-level string, number, boolean, or null is valid too.

truenull42"Foxger"[1, 2, 3]{"ready":true}
How it works

Parse once, then create the result you need

  1. ValidateYour browser parses the input with the built-in JSON parser.
  2. TransformFormat with your chosen indentation or remove insignificant whitespace.
  3. ExportCopy the result or download it directly to your device.
Good to know

Formatting can normalize some values

Foxger uses the browser’s standard JSON.parse and JSON.stringify behavior. Duplicate object keys resolve to the last value, and numbers outside JavaScript’s safe integer range may lose precision. Keep an original copy when exact source text matters.

Fix common errors

Replace single quotes, remove comments and trailing commas, and quote every object key.

Choose output for the task

Formatted JSON is easier to review. Minified JSON is smaller for transport or compact storage.

Optional support

Help keep Foxger useful

Foxger tools are free, private, and built without display ads. Optional support helps keep them maintained, tested, and documented.

Support Foxger