SQL Sanity Checker
Paste a SQL statement to run a quick sanity check for unbalanced parentheses, unterminated quotes, and common typos. Free online SQL validator.
Free SQL Sanity Checker
Paste a SQL statement to run a quick basic sanity check — unbalanced parentheses, unterminated quotes, missing keywords, and a few common typos, all checked instantly in your browser.
How to Use It
Paste your SQL into the box. The checker scans for structural issues like unbalanced brackets/quotes and a few common mistakes, and lists anything it finds.
Example
Pasting SELECT id, name FROM users WHERE status = 'active' ORDER BY name; passes cleanly. Removing the closing quote around activetriggers an "unterminated string" warning.
Common Use Cases
- Catching an unclosed parenthesis or quote before running a query.
- Spotting a trailing comma left behind after editing a column list.
- A quick first-pass check before pasting SQL into a real database client.
FAQs
Does this fully validate SQL syntax for my database?
No — this is a basic structural sanity-checker, not a full SQL parser. It can't validate every rule of every SQL dialect (MySQL, PostgreSQL, SQL Server, etc.) — it only checks for unbalanced parentheses/quotes, the presence of a recognized statement keyword, and a few common typos. Always test real queries against your actual database.
Why did it flag my valid query?
Some warnings are heuristic (like the trailing-comma check) and can trigger on valid, unusual syntax. Treat flagged issues as things worth double-checking, not definitive errors.
Is my SQL uploaded anywhere?
No — checking happens entirely client-side in your browser. Nothing you paste is sent to a server.