All Tools VerseValidate JSON
Check whether text is valid JSON and see its type, key count, and nesting depth, or a clear error. Free, private, and works entirely in your browser.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Processed locally in your browser. Your text never leaves this tab.
How to Use Validate JSON
- Paste your JSON. Drop in the text you want to check.
- Validate. Select the button to parse and check the JSON.
- Read the result. See the type, key count, and depth, or a clear error message.
- Fix and recheck. Correct any problem and validate again.
Frequently Asked Questions
What does the validator check?
It parses the text with a strict JSON parser. If it parses, the JSON is valid and you get a short summary.
What does the error tell me?
It reports why parsing failed and where, such as a missing comma or an unquoted key, so you can fix it quickly.
What counts as valid JSON?
Double quoted keys and strings, no trailing commas, and no comments. The validator follows the strict JSON rules.
Is my data sent anywhere?
No. Everything runs in your browser, so the JSON you paste is never uploaded.
Is it free?
Yes. Every tool here is free to use with no sign up.
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