JSON Validator
Validate JSON syntax instantly in your browser. Paste JSON to see whether it parses, with a clear error if it does not. Free JSON checker.
Processed locally in your browser.
How to use this json validator
Paste JSON and click Validate (or just wait—the checker runs as you type). A green status means JSON.parse succeeded. A red status shows the parser message.
Fix the reported issue and validate again. Use JSON Formatter when you also want pretty-print or minify.
Example
{"ok": true,} is invalid because of the trailing comma. {"ok": true} is valid JSON.
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Frequently asked questions
How do I check if JSON is valid?
Paste it here. If the browser’s JSON parser accepts it, you will see Valid JSON. Otherwise you get the parse error.
Does valid JSON mean my schema is right?
No. This checks syntax only, not JSON Schema, types, or required fields.
Can I format after it validates?
Yes. Open the JSON Formatter to pretty-print or minify the same payload.
Is JSON uploaded to validate?
Processed locally in your browser. We do not upload the text to compute a result.
Last reviewed 2026-08-19. Results stay on your device unless you copy them elsewhere.