JSON Formatter Validate, Format and Inspect JSON

What JSON formatting changes—and what it does not

JSON is a strict text format for objects, arrays, strings, numbers, booleans and null. Formatting adds indentation and line breaks after a successful parse; it does not change property names or values. Minification performs the opposite whitespace transformation, which can reduce transfer size while making manual inspection harder.

Use the validator before placing JSON into an API request, configuration file or structured-data block. A single trailing comma, unescaped quote or missing brace makes standard JSON invalid even when a JavaScript object literal would accept similar syntax.

How to use the JSON Formatter

1. Paste or type JSON in the input editor.
2. Select Format for two-space indentation, Minify for compact output, or Validate for a syntax-only check.
3. Read the status message. Invalid input reports the parser position where the browser detected the problem.
4. Copy the reviewed result or download it as formatted.json.
5. Use Reset before processing unrelated or sensitive data on a shared device.

Common JSON mistakes

• Property names must use double quotes.
• Strings need escaped internal quotes and control characters.
• Trailing commas are not part of standard JSON.
• undefined, functions, comments, dates and regular expressions are not native JSON values.
• Large integers may lose precision when a consumer parses them as ordinary JavaScript numbers.

Processing stays in the current browser page. ScrutnLearn does not upload the JSON to a formatter service.

Frequently asked questions