SQL Formatter
Format, indent, and beautify SQL queries with consistent keyword capitalization across SQL dialects.
About SQL Formatter
Complex SQL queries generated by Object-Relational Mappers (ORMs), database query logs, and reporting scripts often arrive as unformatted single-line blocks of text. Reading and debugging unformatted SQL containing multiple joins, subqueries, and nested case statements causes severe developer fatigue.
Formatting SQL manually with proper indents and consistent keyword capitalization takes considerable manual effort. Inconsistent code formatting across engineering teams complicates version control git diffs.
This in-browser SQL query formatter beautifies, indents, and standardizes SQL code across all major database dialects. It formats keywords in uppercase, aligns SELECT statements, and nests JOIN clauses with clean indentation.
To inspect query inputs, format API payloads with the JSON formatter and generate mock tabular datasets with the HTML table generator.
Step-by-step practical guide
- Paste your raw, unformatted SQL query into the source editor.
- Select your SQL dialect: Standard ANSI SQL, PostgreSQL, MySQL, SQLite, or Microsoft SQL Server.
- Choose your preferred indentation style: 2 spaces, 4 spaces, or Tab indentations.
- Toggle the Uppercase Keywords option to standardize SQL syntax (e.g., SELECT, FROM, WHERE, INNER JOIN).
- Click Format SQL to execute the syntax beautification routine.
- Review the clean query and click Copy SQL to paste the formatted query into your IDE or database management tool.
Engineering specifications and execution details
Tokenizes SQL grammar into lexical tokens: keywords, identifiers, string literals, numeric constants, and comment blocks.
Manages indentation depth stacks across subqueries, parentheses, and CTE (Common Table Expression) blocks.
Aligns major clauses vertically: SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY, and LIMIT.
Preserves inline (--) and multi-line (/* */) comments without corrupting formatting.
Runs purely in browser client JavaScript with zero server interaction.
Data privacy and memory isolation
Proprietary database schemas, table names, and confidential queries remain completely secure on your workstation.
Zero SQL queries are transmitted over network sockets or saved in server logs.
Common production use cases
- Backend developers inspecting raw SQL queries extracted from ORM logs like Prisma, Hibernate, or Entity Framework.
- Data analysts and BI engineers beautifying complex multi-table warehouse reporting queries for documentation.
- Database administrators reviewing slow-query log files to identify missing indexes and bottlenecks.
- Code reviewers establishing consistent SQL style guidelines before merging pull requests.
- Educators and students formatting database homework exercises for clear pedagogical readability.
Edge cases and operational boundaries
- String literals with keywords: Keywords inside single quotes (e.g., WHERE name = "select") are protected from capitalization.
- Backtick and bracket identifiers: Dialect-specific escaped identifiers (like `table` or [column]) are parsed as identifiers without keyword splitting.
- Window functions: OVER (PARTITION BY ... ORDER BY ...) expressions are nested cleanly with inner indents.
- Multiple statements: Script blocks containing multiple semicolon-delimited queries are separated with clean double newlines.
Frequently Asked Questions
Why should SQL keywords be written in uppercase?
Writing SQL keywords in uppercase (such as SELECT, WHERE, JOIN) provides immediate visual contrast between the SQL language syntax and your custom table or column names.
Does this formatter change the execution speed of my query?
No. SQL query execution speed is determined by database query planning, indexing, and execution engines. Formatting solely improves human readability.
Does this tool support PostgreSQL and MySQL specific syntax?
Yes. The formatter accommodates dialect-specific features like backtick escaping, JSON operators (->, ->>), and LIMIT/OFFSET clauses.
Are SQL comments preserved during formatting?
Yes. Both single-line comments (-- comment) and multi-line block comments (/* comment */) are preserved in their exact positions.
Can I format queries containing subqueries and CTEs?
Yes. The parser tracks parentheses depth to cleanly indent nested subqueries and WITH common table expression blocks.
Are my database queries stored or logged anywhere?
No. All parsing and beautification occurs 100 percent in your web browser memory with zero network calls.