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JSON Formatter and Validator Online

Format messy JSON, check its syntax or make a compact version for development.

JSON editor

How to use this free online tool

Enter the information or choose the files requested above, then follow the on-screen instructions. Check the result before downloading or using it elsewhere. Fileswin aims to keep supported processing in your browser, which means your device handles the work and performance can vary with file size, available memory and browser support.

About the result

Results are provided as a practical convenience and should be checked when accuracy is important. Exchange rates can move, date calculations depend on the calendar, and document or image output can vary by application. Keep an original copy of important files.

Frequently asked questions

Is this tool free?

Yes. You can use this tool without creating a Fileswin account. Your browser and internet connection may be needed for optional libraries or live data.

Are my files sent to Fileswin?

This tool is designed to process selected content locally in your browser unless a feature clearly indicates that it uses an external service. Avoid using shared devices for confidential information.

Can I use the result commercially?

That depends on the content you provide and any applicable third-party software or service terms. You are responsible for checking those terms before commercial use.

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Format and validate JSON data

JSON objects use quoted property names, colons between keys and values, and commas between members. Arrays use square brackets. A formatter can make nested data easier to read, while a validator helps locate syntax problems such as trailing commas, missing quotation marks and unmatched braces.

Is formatted JSON different from minified JSON?

Both represent the same data when formatting is valid. Pretty-printed JSON adds indentation and line breaks for people to read; minified JSON removes unnecessary whitespace to reduce its text size. Neither operation encrypts or protects sensitive data.

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