JSON Formatter

A fast, online JSON formatter that formats, validates, and pretty-prints JSON data for developers and data analysts in any browser.

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480+

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 formats JSON data by parsing the input text with a strict JSON parser and re-serializing with consistent indentation. It produces readable JSON suitable for diffs, documentation, API testing, and configuration review.
Core features include syntax validation with precise error location, outputs in formatted or minified form, and the ability to sort object keys recursively when requested. It enforces RFC 8259 compliance and UTF-8 handling.
Intended users are developers, API engineers, data scientists, and QA analysts who routinely exchange JSON payloads. The tool reduces time spent on manual formatting, improves diff clarity, and supports quick copy or export workflows.
Differentiators: deterministic formatting across inputs, strict JSON parsing with helpful error messages, and optional key sorting that preserves data semantics while improving readability. It does not perform schema validation or in-place editing beyond formatting.

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How to Use

Provide the JSON text in the input.
Select formatting options such as indentation (2 or 4 spaces) and sort_keys.
Trigger formatting to generate a formatted or minified version.
Review the resulting JSON for correctness and readability.
Copy or export the formatted JSON for downstream use.

Frequently Asked Questions

Find Quick Answers

What standards does the formatter follow?

It adheres to RFC 8259 for JSON syntax, reports syntax errors with exact line and column positions, and does not perform semantic validation or schema checks unless enabled separately.

Can I sort keys in objects?

Yes. When sort_keys is enabled, the tool recursively sorts object keys to produce a deterministic order, improving diffs and documentation without altering data values or types.

Does it preserve comments?

No. JSON does not support comments, and inputs containing comments are treated as invalid syntax. The formatter will report an error and, if configured, strip non-conforming tokens.

Is this tool free to use?

Yes. The formatter is available as a free online tool with no mandatory signup; basic formatting, validation, and output generation are accessible to all users.

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