JSON Formatter

A tool to format, minify and validate JSON with consistent two-space indentation for developers.

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We're working hard to get this tool ready for you.

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976+

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

This tool accepts a raw JSON payload and returns either a human-friendly pretty-printed string or a compact minified version. It also validates syntax and reports errors when input is invalid. Conceptually it performs parse -> optional transformation (sorting) -> serialization with 2-space indentation, or a minified form. It supports Unicode data and standard JSON types (objects, arrays, strings, numbers, booleans, null). The output is deterministic and suitable for diffs, documentation, and sample payloads. It is valuable for developers, API teams, and data engineers who need quick, reproducible formatting without local tooling. The tool emphasizes correctness, speed, and predictable formatting rules to improve collaboration and reduce manual editing. Users benefit from consistent formatting in code reviews, API docs, and test scenarios, ensuring that sample payloads remain readable and portable across environments. The value lies in immediate feedback, error diagnostics, and flexible output modes that fit common integration workflows.

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How to Use

Provide inputs by pasting raw JSON into the input area.
Choose formatting mode: pretty (2-space indentation) or minify. Optional: enable sort_keys to reorder object keys alphabetically.
Run formatting to generate the output JSON, or perform validation to check syntax only.
Review the outputs: formatted_json string and is_valid indicator; note error_message if invalid.
Copy, export, or integrate the resulting JSON into documentation or code samples.

Frequently Asked Questions

Find Quick Answers

What formats are supported and what happens on invalid input?

The tool accepts valid JSON only. If parsing fails, it returns is_valid as false with an error_message indicating the likely location and nature of the syntax issue, such as unexpected token or trailing comma.

Can I minify the output?

Yes. Selecting minify mode outputs a compact JSON string with no unnecessary whitespace, suitable for payloads or storage. Pretty mode adds two-space indentation for readability.

How does key ordering work?

By default, the formatter preserves input order where feasible. If sort_keys is enabled, keys within each object are sorted alphabetically; note that JSON does not guarantee object key order across all implementations.

How large can inputs be?

The tool handles typical payload sizes well; extremely large inputs may approach memory limits. For very large datasets, consider streaming or offline formatting to avoid memory constraints.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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