JSON Formatter

A fast, rule-based JSON formatter designed for developers and data engineers to clean, organize, and validate JSON with XML-like formatting options.

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1,044+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how JSON Formatter processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

The tool parses a JSON string, validates syntax, and outputs a formatted or minified result. It supports configurable indentation using spaces or tabs and an option to sort keys for deterministic diffs. It can mimic XML-like indentation for visual grouping without converting to XML. It is intended for developers, data engineers, and QA analysts who need clean, repeatable JSON output for tests and logs. The core value is reducing manual reformatting time and improving readability across pipelines. Core features include syntax validation, pretty-print with configurable indentation, optional key sorting, and an XML-like option. Use cases include preparing payloads, inspecting API responses, and creating deterministic test data. Distinctive value lies in the combination of strict RFC 8259 adherence, flexible indentation, and a lightweight, script-friendly interface that avoids external dependencies. Typical workflows involve formatting large responses, diffing between versions, and exporting clean payloads for mock servers.

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How to Use

Provide input_json to the tool.
Configure options: indent_style (spaces or tabs), indent_size (1–
, minify, sort_keys.
Optional: enable XML-like indentation for visual grouping.
Execute formatting to generate the output.
Copy or export the formatted JSON and review for correctness.

Frequently Asked Questions

Find Quick Answers

What does XML-like indentation mean?

XML-like indentation refers to a visual alignment style that emphasizes hierarchical depth using consistent indentation. It does not convert JSON to XML; it only affects how whitespace and line breaks are applied to nested objects for easier reading and diffs.

Can I minify and pretty print in one run?

Yes. The tool allows you to toggle minify output or pretty-printed formatting. When minified, output removes extraneous whitespace; when pretty-printed, output uses the chosen indent_style and indent_size to enhance readability.

How are errors reported?

Errors return a descriptive message with the location in the input string where parsing failed, including line and column when available. This helps identify unexpected tokens, missing braces, or trailing commas in the JSON payload.

Is there schema validation support?

Schema validation is not performed by default. The formatter validates syntax only unless a separate schema validator is used. You can run a dedicated JSON Schema check after formatting to ensure structural conformance.

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