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Postgres SQL Checker

Paste a query to quickly catch common PostgreSQL syntax problems (unclosed quotes/comments, unbalanced parentheses) and flag non-Postgres dialect features (like MySQL backticks, TOP, AUTO_INCREMENT). This tool is a fast lint check—no query is executed.

Category: Data · URL: /tools/postgres-sql-checker.html 


    
  



          

          

            Privacy: runs locally in your browser. No uploads, no tracking scripts.
          

        

      


      
    


    

      
How to use

      
Use this to lint SQL text for common PostgreSQL issues.
  1. Paste your SQL into the input box.
  2. Choose options (allow multiple statements, require trailing semicolon, strict mode).
  3. Click Check SQL to see errors, warnings, and a normalized copy.
  4. Use Copy output to share the report.

      

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        Secondary intents covered: Validate a SQL snippet before running it in PostgreSQL, Find unclosed string literals, identifiers, or comments, Detect unbalanced parentheses in complex queries, Check whether a query contains multiple statements, Spot MySQL/SQL Server syntax that won’t work in Postgres, Enforce a trailing semicolon when needed, Generate a compact normalized version for sharing in tickets, Quickly review queries on mobile without opening a DB client
      

    


    

      
FAQ

    
Does this tool fully validate PostgreSQL syntax?
No—this is a fast lint checker for common mistakes and dialect red flags; it does not implement the full PostgreSQL parser.
Will it run my query against a database?
No. The check runs locally in your browser and does not execute SQL.
What errors can it catch reliably?
Unclosed quotes/comments, unbalanced parentheses, and multiple-statement detection are handled reliably.
Can it help with MySQL-to-Postgres migration?
Yes—it flags common MySQL patterns like backticks, AUTO_INCREMENT, IFNULL(), REPLACE INTO, and LIMIT offset,count.
Does it support PL/pgSQL and DO $$ blocks?
It understands dollar-quoted strings ($$...$$ / $tag$...$tag$) for linting, but it won’t validate PL/pgSQL grammar.
Why do I see warnings even when Status is PASS?
Warnings mean the SQL might run but looks non-Postgres or risky; enable strict mode to treat warnings as failures.
Is my SQL uploaded or stored anywhere?
No network calls are made by this tool; your input stays in the page.