Validate JSON
Check whether JSON is valid and see the exact line and column of any syntax error.
FreeNo uploadNo sign-up
Loading the tool…
How to use the Validate JSON
- Type or paste your input into the Input box, or upload a text file.
- Adjust the options under the tool. The result updates as you type.
- Copy the output or download it as a file.
Private by design
The Validate JSON runs entirely in your web browser. Nothing you enter or open here is uploaded to a server, so it is safe to use with private data and works even when your connection drops after the page has loaded.
Frequently asked questions
Is the Validate JSON free?
Yes. The Validate JSON on Codegres.org is completely free, with no sign-up, no limits and no watermark.
Is my JSON uploaded anywhere?
No. The Validate JSON runs entirely in your browser using JavaScript, so your JSON never leaves your device and is not stored or seen by anyone.
Does the Validate JSON work on my phone?
Yes. It works in any modern browser on Android, iPhone, Windows, Mac and Linux, with nothing to install.