JSON Validator
Use this free online JSON Validator to check if JSON is valid and find the exact line and column of any error. It works instantly in your browser, and your data never leaves your device.
About the JSON Validator
A JSON validator parses your data with a strict parser and reports whether it is valid. When it is not, it points to the line and column of the problem, such as a trailing comma, a single quote or a missing bracket.
Also known as: json lint, jsonlint, validate json, json checker.
How to use the JSON Validator
- Paste your input into the box above, upload a file, or click Sample to try an example.
- Pick any options you need. The JSON Validator processes your input instantly as you type.
- Click Copy to copy the output or Download to save it as a file.
Features
- Free with no signup and no daily limits
- Private: runs entirely in your browser
- Works on mobile, tablet and desktop
- Upload files and download results
- Live results as you type, with clear error messages
- Clean, fast interface with no popups
Frequently asked questions
Is the JSON Validator free to use?
Yes. The JSON Validator is completely free with no signup, no limits on normal use and no watermark.
Is my data safe?
Yes. Everything is processed by JavaScript inside your own browser. Your text is never uploaded to our server or stored anywhere.
Why does it say my JSON is invalid?
The most common reasons are single quotes instead of double quotes, a trailing comma after the last item, keys without quotes, or comments. The error message shows the exact line and column so you can fix it quickly.
Can I upload a JSON file?
Yes. Click Upload to open a .json or .txt file from your device, or paste the content directly. You can download the result as a file.
What else is this tool called?
People also search for it as json lint, jsonlint, validate json, json checker. It is the same free tool.