JSON Formatter

A lightweight tool presenting raw JSON on the left and a formatted, readable version on the right for developers and data engineers.

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Request Feature / Support

488+

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 left input and producing a readable, indented version on the right. It emphasizes a side-by-side comparison to help users see structural relationships and nesting at a glance.
Conceptually, the system uses a standard JSON parser to verify syntax and a deterministic serializer to apply indentation and optional key sorting. If sort_keys is enabled, keys are emitted in alphabetical order; otherwise, input order is preserved. The output remains faithful to the original data types (numbers, booleans, strings, null) while improving readability.
Benefits include faster debugging, easier documentation payloads, and consistent formatting for API responses, test fixtures, and data pipelines. Target users are developers, testers, and data engineers who work with JSON in web services, databases, or data exchange.
Unique value lies in the real-time, side-by-side presentation and precise error reporting that points to exact positions in the input. It requires no local install, supports UTF-8 data, and focuses strictly on formatting, with optional key ordering as an advanced feature.

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How to Use

Provide inputs: Paste raw JSON into the left input area.
Choose options: Set indentation level and decide whether to sort keys.
Run formatting: The tool processes the input and generates the formatted output on the right.
Review outputs: Validate syntax and readability; note any error messages.
Copy/export: Copy the formatted JSON to clipboard or download as a file.

Frequently Asked Questions

Find Quick Answers

How does it handle invalid JSON?

When input is not valid JSON, the tool reports a syntax error with the location and does not produce a formatted result until the error is resolved.

Can it sort object keys?

Yes, enable sort_keys to output object keys in alphabetical order. If disabled, keys are preserved in input order.

Does it preserve data types?

Formatting preserves numbers, booleans, strings, and null values exactly as in the input; no type coercion occurs.

Can I export or copy the formatted output?

Yes, you can copy the formatted JSON to the clipboard or download it as a file for integration with tests, docs, or pipelines.

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