JSON Formatter

Format and beautify large JSON files with indentation, sorting, and validation. Upload files or paste JSON directly.

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3,704+

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 JSON Formatter tool allows you to format, validate, and beautify JSON data, even for large files. You can paste JSON directly or upload a file, then choose formatting options like indentation (2 or 4 spaces), sort keys alphabetically, or minify the JSON. The tool validates the JSON for syntax errors and provides detailed error messages. Formatted output is displayed with syntax highlighting and can be copied or downloaded.

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How to Use

Paste your JSON into the textarea or upload a JSON file by clicking the upload area.
Select formatting options: indentation (2 or 4 spaces), sort keys, or minify.
Click 'Format JSON' to process. If there are errors, they will be highlighted.
View the formatted JSON in the result area, then copy or download it.

Frequently Asked Questions

Find Quick Answers

What is the maximum JSON size this tool can handle?

The tool can handle very large JSON files efficiently in the browser, but performance depends on your device's memory. For extremely large files (over 100MB), consider splitting the JSON.

Does this tool send my JSON data to a server?

No, all processing is done client-side in your browser. Your JSON data never leaves your computer, ensuring privacy.

Can I format minified JSON?

Yes, paste minified JSON and select an indentation option to beautify it. The tool will add proper spacing and line breaks.

What happens if my JSON is invalid?

The tool will highlight the error in the input and show a detailed error message, including the line number and description.

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