SQL Linter Online

How to Use

1. Paste SQL or upload a .sql file
2. Select your SQL dialect and lint preset
3. Click Analyze SQL or enable auto-lint
4. Review issues, scores, and recommendations
5. Toggle rules, download reports, or apply style fixes

SQL Linter vs Validator vs Formatter

Use the Validator to catch syntax errors, the Linter to improve code quality, and the Formatter to prettify valid SQL. Together they form a practical pre-flight workflow before running scripts against a database.

Example: before and after review

-- Before (lint flags: SELECT *, comma join, DELETE without WHERE)
select * from users u, orders o
delete from logs

-- After team review
SELECT u.id, u.email, o.total
FROM users AS u
INNER JOIN orders AS o ON u.id = o.user_id;

DELETE FROM logs WHERE created_at < NOW() - INTERVAL '90 days';

Best practices

• Avoid SELECT * in production queries
• Use explicit JOINs instead of comma joins
• Always scope DELETE and UPDATE with WHERE unless intentional
• Pick one keyword casing convention per project
• Validate syntax after fixing lint issues

Related tools

• SQL Syntax Checker & Validator
• SQL Formatter & Beautifier
• SQL Minifier
• Text to SQL Converter
• SQL to Text Converter
• SQL to CSV Converter
• SQL to JSON Converter
• SQL to YAML Converter