JSON Validator

It parses your input against the JSON specification and reports the first syntax problem with its exact line and character position, plus structural stats such as object counts, array counts, and maximum nesting depth.

Yes. Drag the file into the input area or use the file loader — validation runs on the file contents directly in your browser, and nothing is uploaded.

The most common causes are trailing commas after the last element, single quotes around keys or strings, unquoted keys, comments (which JSON does not support), and smart quotes pasted from word processors.

Yes. Validation happens entirely inside your browser tab using local parsers — your data never touches a server.

Yes. When validation fails, the error message includes the line and character position of the offending token, so you can jump directly to the problem instead of hunting through the payload.

Yes — paste the raw text or load the file. The parser reads the entire input and reports either valid syntax or the first error encountered, whichever comes first.

No. Validation is read-only; your input stays untouched. Pair it with the formatter if you also want cleaned-up output.