SQL Stored Procedure Formatter & Beautifier Online

Stored Procedure Formatter

Format and beautify SQL stored procedures with proper indentation for BEGIN...END, IF...ELSE, and nested blocks.

Note: This tool applies hierarchical indentation to procedural blocks. While it handles most common patterns, extremely complex or dialect-specific syntax (like PostgreSQL dollar-quoting or MySQL DELIMITER commands) may require manual review.

Why Standard SQL Formatters Struggle with Stored Procedures

If you have ever tried to run a 200-line stored procedure through a generic online SQL formatter, you have likely encountered a frustrating result: the header and the final SELECT statement look fine, but the entire procedural body remains a dense, unreadable block. This is not a bug; it is a structural limitation of how most formatters are built.

Generic formatters are designed to parse declarative query statements like SELECT, INSERT, and JOIN. They do not understand procedural control flow. In PostgreSQL, a PL/pgSQL procedure body is wrapped in dollar-quoting ($$ ... $$), which the outer parser treats as a single, opaque string token[reference:4]. In MySQL, a procedure requires a client-side DELIMITER command so the client does not split the procedure on every internal semicolon—a command that standard formatters do not recognize and can accidentally break[reference:5]. Even in SQL Server (T-SQL), where BEGIN...END is closer to standard syntax, most formatters are built around the SELECT grammar and simply do not indent the procedural wrapper itself relative to the CREATE PROCEDURE header[reference:6].

What a Stored Procedure Formatter Must Do

Formatting a stored procedure correctly requires a formatter to understand the code on three separate layers[reference:7]:

  • The Header and Parameters: The CREATE PROCEDURE statement and its parameter list should be aligned, typically with one parameter per line.
  • The BEGIN...END Block: The outer block that holds the procedure body must be indented one level deeper than the CREATE PROCEDURE line. Every statement inside the block should then be indented one level deeper than the BEGIN.
  • Procedural Control Flow: Nested IF...ELSE, WHILE, TRY...CATCH, and inner BEGIN...END blocks must each open a new indentation level. This hierarchical indentation is what makes the logic of a complex procedure visually understandable[reference:8].

This tool is built to handle these three layers. It applies a rule-based transformation that detects block-opening keywords and increases indentation for the statements that follow, then decreases it when the block closes.

Common Formatting Problems in Real-World Stored Procedures

When reviewing legacy or generated stored procedures, developers consistently encounter the same issues:

  • Tabs and Inconsistent Spacing: A procedure that mixes tabs and spaces becomes visually misaligned in different editors, making nested logic impossible to follow[reference:9].
  • Leading Commas: Placing commas at the beginning of lines in a SELECT list is a stylistic choice, but it can break standard formatting conventions and make column alignment difficult to scan[reference:10].
  • Missing BEGIN...END Blocks: A procedure body that is not enclosed in BEGIN...END reduces clarity and makes it harder for maintainers to discern the intended logical boundaries of the code[reference:11].
  • Flattened Control Flow: An IF statement that spans multiple lines without indentation is functionally correct but cognitively demanding to read. Indenting the body of an IF block visually separates the condition from the action.

This tool addresses these issues by enforcing a consistent indentation structure and keyword casing. It does not rewrite your logic or change your data; it only adds whitespace and standardizes the case of SQL keywords, ensuring the formatted code is semantically identical to the original[reference:12].

Dialect Considerations: T-SQL, MySQL, and PostgreSQL

This formatter provides dialect selection because procedural syntax varies significantly between database systems:

  • SQL Server (T-SQL): Uses BEGIN...END blocks and IF...ELSE without requiring special delimiters. It supports TRY...CATCH for error handling and uses bracketed identifiers like [dbo].[Table][reference:13].
  • MySQL: Requires a DELIMITER command to redefine the statement delimiter before the procedure body is defined. While this tool will format the body, you should ensure your DELIMITER lines are preserved when running the script[reference:14].
  • PostgreSQL (PL/pgSQL): Wraps the procedure body in dollar-quoted strings (e.g., $$ ... $$). This tool will format the code inside the dollar quotes, but it does not alter the dollar-quoting itself[reference:15].

How to Use This Tool

  1. Paste Your Procedure: Copy your entire CREATE PROCEDURE script into the input textarea.
  2. Select Your Dialect: Choose the database system you are targeting (T-SQL, MySQL, or PostgreSQL).
  3. Set Formatting Options: Choose your preferred keyword case and indent size.
  4. Format and Review: Click "Format Stored Procedure" and review the output. The tool will indent nested blocks and standardize keyword casing, making the logical structure of your procedure immediately visible.
  5. Copy and Test: Copy the formatted code back into your database client or migration script, and run it to confirm the logic remains intact.

Frequently Asked Questions

Why do generic SQL formatters fail on stored procedures?

Generic formatters are built to parse declarative queries (SELECT, INSERT, JOIN) and do not understand procedural control flow. In PostgreSQL, the procedure body is wrapped in dollar-quoting ($$...$$), which the parser treats as a single string. In MySQL, the DELIMITER command is a client-side instruction that standard formatters do not recognize. Even in T-SQL, most formatters do not indent the BEGIN...END wrapper relative to the CREATE PROCEDURE header[reference:16].

Does formatting change the logic or performance of my procedure?

No. This tool only changes whitespace, line breaks, indentation, and the case of SQL keywords. It does not alter variable names, table names, logic, or execution order. The formatted procedure will produce exactly the same results as the original[reference:17].

Can this tool handle nested IF, WHILE, and TRY...CATCH blocks?

Yes. The formatter detects block-opening keywords (BEGIN, IF, WHILE, TRY) and increases indentation for the statements that follow. When it encounters the corresponding closing keyword (END, ELSE), it decreases the indentation level. This creates a clear visual hierarchy for nested control flow[reference:18].

Is my stored procedure code sent to a server?

No. The entire formatting process runs in your browser using client-side JavaScript. Your procedure code never leaves your device and is not sent to, logged by, or stored on any server. This makes the tool safe for use with proprietary database logic[reference:19][reference:20].

Why is my MySQL procedure not formatting correctly?

MySQL stored procedures require a DELIMITER command before the CREATE PROCEDURE statement. This is a client-side command, not standard SQL. Ensure you include the DELIMITER lines when running the script. This tool will format the procedure body, but it does not generate or alter the DELIMITER commands themselves[reference:21].

Does this tool validate or check for syntax errors?

No. This is a formatter, not a linter or a full SQL parser. It applies rule-based indentation and keyword casing to common procedural patterns. If your procedure contains a syntax error, the formatter will still attempt to format it, but it will not flag the error. The formatted code will fail when you run it against your database.

Can I format a procedure that contains comments?

Yes. Single-line comments (--) and block comments (/* ... */) are preserved and passed through the formatter. The tool does not alter the content of comments, ensuring that documentation and annotations remain intact.

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