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Formatting an entire 25 million line codebase overnight: the rubyfmt story

Stripe engineers share their experience using Rubyfmt to automatically format their massive 25 million-line Ruby codebase in a single night, highlighting the technical challenges and solutions involved in such a large-scale formatting operation. The article provides insights into the benefits of code formatting at scale and the development of Rubyfmt as a tool for the Ruby community.

Background

Code formatting tools like Prettier for JavaScript have become essential for maintaining consistent code style in large projects, but implementing such tools for dynamic languages like Ruby presents unique challenges. Ruby's flexible syntax and multiple ways to write the same code make automated formatting particularly complex.

Source
Lobsters
Published
May 8, 2026 at 01:53 AM
Score
7.0 / 10