SQL Formatter

Why Format Your SQL Queries?

Readable SQL is maintainable SQL. When queries are written as single-line strings or copy-pasted from log files, they become nearly impossible to debug or review. A properly formatted query with consistent indentation, keyword alignment, and logical grouping makes it immediately clear what data is being selected, which tables are joined, and what filters are applied. This is especially critical during code reviews, incident response, and performance optimization sessions.

How This Formatter Works

The tool parses your SQL by first protecting quoted string literals from modification, then normalizing all whitespace to single spaces. It identifies major SQL keywords (SELECT, FROM, WHERE, JOIN, ORDER BY, GROUP BY, HAVING, LIMIT) and inserts line breaks before each one. Sub-clauses like AND, OR, and column lists receive additional indentation to create a visual hierarchy that mirrors the logical structure of the query.

SQL Formatting Best Practices

Uppercase keywords: Using uppercase for SQL keywords (SELECT, FROM, WHERE) distinguishes them from table and column names, improving scannability. One clause per line: Each major clause on its own line makes it easy to comment out or modify individual parts. Consistent indentation: Use 2 or 4 spaces for sub-clauses. Alias everything: Give tables short aliases (e.g., users AS u) to keep formatted queries compact.

Common Formatting Scenarios

This tool handles complex queries including multi-table JOINs with ON conditions, nested subqueries, CASE/WHEN expressions, window functions with PARTITION BY and ORDER BY clauses, and Common Table Expressions (CTEs) using WITH. Paste any valid SQL and the formatter will produce clean, readable output ready for documentation, code review, or Slack.