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Structured Data

JSON Formatter

Format JSON data with readable indentation.

Tool workspace

Needs input

Your input stays in this browser.

Add the required input to continue.

Input

Add your source and choose the required options.

Indentation

Indentation

Results update automatically.

Your result appears here

Complete the required input to continue.

Direct answer

What JSON Formatter does

The JSON formatter adds indentation and line breaks without rewriting data tokens. It preserves large numeric identifiers, decimal and exponent notation, string escapes, member order, and duplicate members. Choose spaces or tabs to inspect the result.

Output

What you receive

The output changes whitespace outside strings. It does not round numbers, rename fields, sort keys, or repair invalid syntax.

Common questions

Answers about JSON Formatter

Will JSON Formatter change large JSON numbers?

No. The formatter preserves original numeric text, including large integers and exponent notation. A receiving application can still impose its own precision or range limits after you copy the result.

What happens to duplicate JSON object keys?

The formatter keeps duplicate members in their original order. Duplicate names can cause interoperability problems because other parsers can discard or handle them differently. Formatting cannot determine the intended value.

Does JSON formatting validate my application data?

It checks JSON syntax. It does not validate required fields, business rules, or receiver compatibility. Use your application schema and tests when you need data validation beyond JSON syntax.

Use this tool

How to use JSON Formatter

  1. Paste one valid JSON value into JSON input.
  2. Choose spaces or tabs. Set Spaces per level when you use spaces.
  3. Compare important identifiers and fields, then copy or download the result.

Processing

Browser processing

This tool processes its input in your browser. Your files and text stay on your device.

Common uses

Where JSON Formatter fits

  • Inspect API responses without changing long numeric identifiers.
  • Prepare readable or compact JSON for a debugging workflow.
  • Keep duplicate members visible while investigating a source-data problem.

Limits

Check before you use the result

  • Syntax validation does not check your application schema or business rules.
  • Duplicate object names remain in the output. Other parsers can discard duplicates or handle them differently.
  • Preserved number text can exceed another system's numeric precision or range. Formatting cannot make every receiver support it.
  • Formatted output has a 20 million character limit. Use less indentation or a smaller input when necessary.
  • This tool does not change comments, trailing commas, or other invalid syntax into valid JSON.

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Structured Data

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Evidence-led guidance

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