SQL Validator

SQL Validator

Updated August 21, 2026

SQL validator online. Check SQL syntax, find unclosed quotes and parentheses, and see parse errors with line numbers. Free SQL checker, no upload.

Dialect

SQL

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Features
 
  •  Catch unclosed quotes, dollar quotes, and block comments
  •  Catch unmatched parentheses with a line and column
  •  Dialect-aware parse via the same engine as the formatter
  •  Count statements, JOINs, SELECTs, and mentioned tables
  •  Live check as you type, no upload
  •  Works for PostgreSQL, MySQL, SQLite, SQL Server, BigQuery, Snowflake
 
Common Use Cases
 
  •  See why a paste from Slack will not run
  •  Confirm a hand-edited migration is at least parseable
  •  Count how many statements are in a script before you run it
  •  List tables referenced in a messy query
  •  Check a query after a find-and-replace
 
Syntax check vs running the query
 
This tool checks syntax: quotes close, parentheses match, and the formatter’s parser can read the statement. It does not connect to a database. A query can be syntactically fine and still fail at runtime (unknown column, permission denied, bad JOIN).


It is also not a linter for anti-patterns. SELECT * and missing WHERE on DELETE are valid SQL. The explainer calls those out in English; the validator does not block them.
 
Examples
 
 Valid - Valid SELECT
 
SELECT id FROM users WHERE active = TRUE;
 Invalid - Unclosed parenthesis
 
SELECT id FROM users WHERE (active = TRUE;
 Invalid - Unclosed string
 
INSERT INTO t (name) VALUES ('Ada);
  
Frequently Asked Questions
 
 
Does this execute my SQL?
 
No. There is no database here. The check is local parsing only.
 
Why is a misspelled keyword still “valid”?
 
The parser may treat unknown words as identifiers. FORM users can look like a table named FORM. Use the explainer or read the formatted output if something feels off.
 
Is schema validation included?
 
No. We do not have your tables. Pair this with your engine’s EXPLAIN when you need a plan.
  
Related Tools
 
SQL Formatter
 
Pretty-print after it parses
 
Try it 
SQL Explainer
 
See clauses in English
 
Try it 
SQL Diff
 
Compare two queries
 
Try it 
 
 Tips
 
  •  Pick the dialect you will run. Postgres dollar quotes fail under MySQL.
  •  A DELETE without WHERE is valid SQL and dangerous. Read it twice.