Validate SQL syntax locally with dialect-aware parsing and actionable diagnostics.
Catching syntax errors early saves time during migrations, code reviews, and CI checks. A quick validation pass helps you fix missing commas, broken strings, and dialect mismatches before connecting to a database.
-- Invalid SELECT id FROM users WHERE (status = 'active'; -- Fix SELECT id FROM users WHERE (status = 'active');
An SQL syntax checker analyzes SQL text for structural and parse-level errors without executing queries against a database. It helps you catch typos, missing punctuation, and dialect mismatches before running SQL in production.
No. It never connects to a database and never runs your queries. Validation is static analysis only.
PostgreSQL, MySQL, MariaDB, SQLite, SQL Server (T-SQL), Oracle PL/SQL, BigQuery, Snowflake, Redshift, DuckDB, DB2, Trino, Spark, Hive, ClickHouse, and generic SQL.
SQL parsers are dialect-aware. The same script may validate under PostgreSQL but fail under T-SQL if vendor syntax differs. Always pick the dialect that matches your database engine.
No. It cannot know whether a table exists, whether a JOIN is correct for your schema, or whether a query returns the intended rows without schema context and execution.
Partially at best. Complex procedural blocks, custom delimiters, and vendor-specific PL/SQL or T-SQL bodies may not parse fully. Treat results as helpful but not exhaustive for procedural SQL.
Yes for typical multi-statement dumps within browser size limits. Very large dumps may require splitting the file or using a CLI linter.
Not in v1. The tool shows fix hints and line markers, but it does not modify your SQL automatically.
No. Validation runs entirely in your browser. Your SQL stays on your device.
Small and medium scripts validate instantly. Inputs above ~300 KB use a Web Worker. Extremely large files may slow the browser; multi-gigabyte dumps are not supported in-browser.
Yes. After the page loads, validation works offline because processing is client-side.
Empty input, unbalanced parentheses, unterminated single- or double-quoted strings, and unterminated block comments.
Invalid tokens, unexpected keywords, and malformed clauses reported by the dialect-aware SQL parser when beautify parsing fails.
SELECT *, DELETE or UPDATE without WHERE, CROSS JOIN review notes, and common reserved-word identifier patterns. These are suggestions, not syntax errors.
Validation checks whether SQL can be parsed for a dialect. Formatting rearranges whitespace for readability. Use the validator to debug errors, then the formatter to prettify valid SQL.
No. Your input is never modified. You copy or hand off SQL to other tools manually.
Yes. Enable auto-validate for debounced live checks, or click Validate SQL / press Ctrl+Enter for immediate validation.
Yes when the parser or structural checker can determine them. The editor highlights the primary error location.
Yes. Copy diagnostics or download a plain-text report from the results panel.
Yes. Use the Format or Minify buttons to hand off your current SQL to those tools.
Yes. Structural scanning respects quoted strings, so Unicode text inside literals is preserved during checks.
Yes. Statements are split on semicolons outside quoted strings and validated individually with statement indexes in error messages.
No. Warnings and info messages do not mark SQL invalid unless a syntax or structure error is present.
No. It is heuristic only. Use it as a hint and confirm the dialect manually when accuracy matters.
No for teams needing configurable lint rules, auto-fix, or CI integration. This tool is a fast browser-side syntax checker for individuals and ad hoc review.
No. Without an uploaded schema or live database connection, table/column existence cannot be verified.
Modern Chromium, Firefox, Safari, and Edge browsers with Web Worker and localStorage support.
Yes. SQL Formatter, Minifier, Text to SQL, and SQL to Text can hand off SQL into this validator.
Ctrl+Enter on Windows/Linux or Cmd+Enter on Mac.
Yes. No account, usage limit, or per-query charge. All processing is local and free.