JSON Formatter & Validator
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How to use JSON Formatter & Validator
- Choose your file (or drop it onto the page).
- Adjust the options shown.
- Select the action button and wait for it to finish.
- Review the result, then download it.
What to expect
A new file is created. Your original file is never modified.
- Processing happens in your browser, so very large files depend on your device's memory.
Frequently asked questions
Is my JSON sent to a server?
No. It is parsed in your browser tab.
Why does it say invalid JSON?
Common causes are trailing commas, single quotes, unquoted keys or comments. The message shows the line and column.
Do I need to create an account?
No. Every tool works without sign-up or login.
Is it safe for confidential documents?
Files are processed locally in your browser and never uploaded. Close the tab or select Clear to release them from memory.