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JSON formatter online.

JSON is commonly used for API responses and configuration. Indentation makes nested objects and arrays easier to read, while validation helps catch invalid syntax. No sign-up required.

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How to use JSON Formatter

  1. Paste JSON data into the editor.
  2. Run the formatter to validate and indent the document.
  3. Copy the formatted result into your development workflow.

Practical example

A response such as {"user":{"name":"Alex","active":true}} becomes easier to inspect when nested keys appear on separate indented lines.

Important limitations

Standard JSON does not allow comments, trailing commas or unquoted property names. Formatting cannot fix every invalid document automatically.

Frequently asked questions

Does formatting JSON change its values?

A normal parse-and-stringify formatting operation preserves JSON data values, although whitespace and formatting change.

Can JSON contain comments?

No. Comments are not part of the standard JSON syntax.

Does formatting fix invalid JSON?

No. Fix invalid quotes, commas and brackets before formatting.

Can JSON contain comments?

Standard JSON does not support comments.

Related tools and guides

Explore the related tools alongside this page or read more in our practical guides.