SQL code online formatter - SQL beautifier, supports multiple SQL syntaxes

This tool, based on prettier-plugin-sql, provides one-click online formatting and beautification of SQL code. It supports common database dialects (such as MySQL, PostgreSQL, SQL Server, and Oracle), and automatically optimizes indentation, alignment, and line breaks, improving query readability and code consistency. It's installation-free and ready to use, making it suitable for debugging, code review, and teaching scenarios.

Inspiration

The inspiration stems from the often messy queries encountered in development and operations—long conditions, nested subqueries, and concatenated statements are difficult to read. Our goal is to use a stable open source formatting engine to offload formatting work to online tools, allowing developers to focus on business and performance optimization, rather than whitespace and line breaks.

Usage

1. Paste the SQL code into the input box.

2. Select the corresponding database dialect.

3. Click "Format" to view and copy the formatted results.

Application Scenarios

• Temporarily beautify complex queries for debugging and troubleshooting.

• Unify the team's SQL formatting style before submitting code.

• Display standardized SQL examples in documentation or technical presentations.

• Quickly verify the readability of SQL snippets captured from logs or interfaces.

Implementation Principle

The tool uses the Prettier SQL plugin (prettier-plugin-sql) to parse the input SQL (generate an abstract syntax tree) and reformat it, unifying indentation, alignment, and line breaking while preserving semantics. The plugin supports dialect options to adapt to syntax extensions in different databases, relying on a mature open source ecosystem to ensure consistent and maintainable formatting.

FQA

1. What SQL dialects are supported?

   Common dialects (such as MySQL, PostgreSQL, SQL Server/T-SQL, Oracle/PL-SQL, SQLite, BigQuery, etc.) are supported, and dialect selection is provided to accommodate specific syntax extensions.

2. Does formatting change the SQL execution results or logic?

   No. The tool only changes the visual layout (whitespace, line breaks, indentation, alignment, etc.) and does not adjust query semantics or table/column names.

3. Will my SQL be saved or uploaded to the server?

   No, please refer to the privacy policy for specific guarantees.

4. What should I do if a parsing error or formatting failure occurs?

   Common causes are incomplete syntax or mismatched dialects. We recommend first verifying the syntax in the database client, selecting the correct dialect, or breaking complex statements into sections and formatting them piecemeal to identify the problem.