JavaScript Validator

This tool accepts JavaScript code and performs static validation to identify syntax errors, improper use of strict mode, and common runtime pitfalls without executing the code. It supports multiple ECMAScript versions and can emphasize issues that typically arise during development and review. The process relies on parsing the input into an AST, applying a curated rule set, and returning structured diagnostics. The tool is designed for developers, code reviewers, educators, and QA engineers who need rapid feedback on code snippets, documentation samples, or pre-commit checks. By offering deterministic results based on the provided ES version and mode, it helps teams enforce correctness early in the lifecycle and reduces debugging time. Core value lies in quick, actionable insights and the ability to integrate static checks into lightweight workflows. Core features include syntax validation, optional strict-mode analysis, and basic runtime-pattern hints that do not involve executing code. Use cases span web and Node.js contexts, from validating snippets in tutorials to pre-commit checks for repositories.