SQL Query Validator

The tool analyzes a submitted SQL string, validating syntax against the selected dialect (PostgreSQL, MySQL, MSSQL, SQLite) and reporting syntax errors with precise line and column references. It performs lightweight semantic checks such as semicolon placement and basic keyword usage. This tool is intended for developers, DBAs, data engineers, and analysts who draft queries and need fast feedback before execution on a database.
Validation proceeds in three stages: tokenization, parsing, and error localization. The tokenizer converts the query into tokens; the dialect-specific parser builds an abstract syntax representation; and the validator maps errors to exact positions and suggests corrective steps. If no errors are found, the tool can optionally format the query for readability and consistency.
Unique value includes cross-dialect awareness, immediate feedback during drafting, and the ability to export validated results for integration into CI pipelines. By providing actionable error messages rather than vague notes, it helps users learn dialect rules and reduce debugging time. The tool is useful for education, code reviews, data migrations, and QA of SQL scripts.
Core features include dialect selection, real-time syntax validation, error reporting with line and column, optional formatting, and a lightweight explain plan view for supported dialects. Use cases span learning SQL, validating migration scripts, pre-load checks before data loads, and enforcing project standards across teams.