Format SQL Queries for Readability and Fewer Bugs

A 20-line SQL query on a single line is impossible to debug. Proper SQL formatting — with aligned keywords, indented subqueries, and separated clauses — turns opaque queries into self-documenting code that reviewers can actually understand.

What Is SQL Formatter?

SQL formatting capitalizes keywords, indents clauses, aligns JOIN conditions, and separates logical sections. Our SQL Formatter supports MySQL, PostgreSQL, SQL Server, and SQLite dialects.

How to Use SQL Formatter on DevToolHub

1. Open the SQL Formatter tool on DevToolHub — no signup required.
2. Paste or enter your input data in the left panel.
3. See the result instantly in the output panel.
4. Copy the result or download it as a file.

Formatting a Complex Query

Transform a wall of SQL into readable structure:

-- Before
SELECT u.id, u.name, u.email, COUNT(o.id) as order_count, SUM(o.total) as total_spent FROM users u LEFT JOIN orders o ON u.id = o.user_id WHERE u.created_at > '2024-01-01' AND u.status = 'active' GROUP BY u.id, u.name, u.email HAVING COUNT(o.id) > 5 ORDER BY total_spent DESC LIMIT 20;

-- After
SELECT
  u.id,
  u.name,
  u.email,
  COUNT(o.id) AS order_count,
  SUM(o.total) AS total_spent
FROM users u
LEFT JOIN orders o
  ON u.id = o.user_id
WHERE u.created_at > '2024-01-01'
  AND u.status = 'active'
GROUP BY u.id, u.name, u.email
HAVING COUNT(o.id) > 5
ORDER BY total_spent DESC
LIMIT 20;

Pro Tips

• Capitalize SQL keywords (SELECT, FROM, WHERE) to distinguish them from column names
• Each JOIN gets its own line with the ON condition indented beneath
• Put each column in SELECT on its own line for easy modification
• Format subqueries with extra indentation to show nesting level

When You Need This

• Cleaning up SQL from query logs and ORM debug output
• Preparing SQL examples for database documentation
• Reviewing complex queries in pull requests
• Debugging slow queries by understanding their structure