A single missing comma or an unescaped double quote inside a large JSON payload can cause critical application failures, resulting in 'SyntaxError: Unexpected token' messages across your terminal. Manually hunting for these tiny typos inside hundreds of lines of code is miserable. Our strict JSON validator engine analyzes your input line-by-line, verifying it against official formatting standards. If it detects anomalies—such as trailing commas, single quotes (which are prohibited in strictly valid JSON), or unbalanced curly brackets—it intercepts the parsing operation and points you directly to the offending line number, highlighting the exact character causing the catastrophe.