How to use
01
Paste JSON
Drop your JSON in the input box.
02
Click Validate
We parse it and report any errors with line info.
Why JSON Validator
- 100% client-side, your data never leaves your browser.
- Strict RFC 8259 validation catches real bugs.
- Clear error messages pinpoint exactly what's wrong.
Common questions
Is JSON Validator free to use?
Yes. JSON Validator is completely free. There is no sign up, no trial, and no usage cap.
Do I need an account to use JSON Validator?
No. You can start using JSON Validator straight away. We do not ask for an email address or a login.
Is my data uploaded to a server when I use JSON Validator?
No. JSON Validator runs entirely inside your browser, so the code or data you enter never leaves your device and nothing is sent to us.
Do you store the code or data I use with JSON Validator?
No. Because everything happens locally in your browser, there is nothing for us to store. Close the tab and it is gone.
Can I paste minified or messy code into JSON Validator?
Yes. JSON Validator handles compact, minified, or untidy input and processes it the same way.
Does JSON Validator flag errors in my input?
Where it applies, JSON Validator points out where something looks invalid so you can fix it quickly.
How do I use JSON Validator?
Enter or paste your code or data and JSON Validator updates the result as you go. When it looks right, copy or download it with one click.
Does JSON Validator work on phones and tablets?
Yes. JSON Validator is responsive and works in any modern browser on mobile, tablet, and desktop.
Which browsers does JSON Validator support?
It works in current versions of Chrome, Firefox, Safari, and Edge. For the best experience, keep your browser up to date.
Is there a limit on how often I can use JSON Validator?
No. You can use JSON Validator as many times as you need, at no cost.
Can I use JSON Validator for commercial or client work?
Yes. You are free to use the output in personal, educational, and commercial projects.
Why is JSON Validator free?
The site is supported by advertising, which lets us keep every tool free and open to everyone.
What should I do if JSON Validator gives an unexpected result?
First check that your code or data is formatted as expected. If something still looks wrong, use the feedback link on the page and we will take a look.