JSON Validator
To validate JSON, paste it and the validator parses it against the JSON standard (RFC 8259). Valid JSON shows its size, depth and key count; invalid JSON shows the error message with its line and column and a hint for the usual mistakes.
- Free
- No signup
- Runs in your browser
How to use JSON Validator
- 1Type or paste your input into the JSON Validator.
- 2Choose any options you need.
- 3See the result update instantly.
- 4Copy the result or download it.
JSON Validator: questions people ask
What are the most common JSON errors?
A trailing comma after the last item, single quotes instead of double quotes, unquoted keys, comments, and NaN or undefined values, none of which JSON allows.
Does it validate against a JSON Schema?
No. It checks that the JSON is well-formed. Schema validation checks the structure against rules you define, which is a separate step.
Is my data uploaded when I use the JSON Validator?
No. The JSON Validator runs entirely in your web browser, so your text and numbers stay on your device and work even on a slow connection.
Does the JSON Validator work on iPhone, Android and Mac?
Yes. The JSON Validator runs in any modern browser (Safari, Chrome, Edge or Firefox) on iPhone, iPad, Android phones, Mac, Windows and Chromebook. There is no app to install.
Is the JSON Validator free?
Yes. The JSON Validator is free with no signup, no watermark and no daily limit.