Paste the entire JSON document into the input area and choose syntax validation before running Validate. You can test the example below without supplying a schema: its key is quoted and its numeric value needs no quotation marks. Read the validation result before copying anything into your application. A successful syntax check means the document can be parsed; it does not prove that the fields meet your application rules.
Switch to schema validation when you have a schema describing those rules, and paste it into the separate schema input. Check advanced limits if a large or deeply nested document is rejected. The file size setting and available browser memory constrain validation. Correct one reported problem at a time, then rerun the same validation mode.
Input: {"count":2}
Syntax result: valid JSON
It verifies that your text is valid JSON according to RFC 8259: proper key quoting, correct bracket/brace matching, valid data types, no trailing commas, and correct escape sequences. It catches errors that would cause JSON.parse() to fail.
Trailing commas after the last item, single quotes instead of double quotes, unquoted keys, missing commas between items, and comments (JSON doesn't support them). Our validator pinpoints the exact line and character position of each error.
All valid JSON is valid JavaScript, but not vice versa. JavaScript allows single quotes, unquoted keys, trailing commas, and comments β none of which are valid JSON. Always validate if your JSON will be consumed by non-JavaScript parsers.
Yes β paste any text and the validator in your browser tells you whether it's valid JSON. This is useful for debugging API responses, checking webhook payloads, and verifying that your serialization code produces correct output.
Processing runs in your browser. Choosing Share uploads the selected tool state; anyone with the link can open it. Signing in to save sends content to your account library and records save history. Review the selection before either action. Closing the page does not delete those copies. Copying locally does not create a server share.