pgFormatter vs SQLFluff

pgFormatter is free software for formatting PostgreSQL SQL queries and PL/pgSQL code. It supports SQL-92, SQL-99, SQL-2003, SQL-2008, SQL-2011 and PostgreSQL syntax, and the project says it also works with other databases. You can run it as a console program or CGI application that returns text or HTML; a CGI request with an application/json Accept header can return JSON. Formatting controls cover keyword, function, identifier and type case, indentation, query wrapping and comma placement. The --anonymize option hides query literals before formatting. The project documents source installation with Perl Makefile.PL, make and make install, Docker use, Vim and (Neo)Vim integration, Atom and Visual Studio Code links, and a pre-commit hook for SQL files. An online demo limits queries to ten thousand characters. It is distributed under the PostgreSQL Licence at free.

SQLFluff is an open-source, dialect-flexible SQL linter designed for ELT applications. It reports style and syntax issues, parses SQL without database access and can automatically fix many violations with one command. Documentation describes support for more than 25 dialects, including T-SQL, PostgreSQL, BigQuery and Snowflake, alongside more than 70 rules for style, structure and best practices. Jinja templating and dbt are supported, and CI/CD integration includes GitHub Actions output for pull-request annotations. SQLFluff is free under the MIT License and installs from PyPI with pip or another Python package manager. It does not execute SQL itself, but templating macros such as dbt's run_query may execute arbitrary SQL. The Jinja templater uses Jinja2 SandboxedEnvironment to limit unsafe code execution. The dbt templater requires the relevant adapter and sqlfluff-templater-dbt package; models accessing a database during compilation require database access. Community support includes documentation, GitHub, Slack and Stack Overflow.