Codemodder – A new codemod library for Java and Python
Hi HN, I’m here to show you a new codemod library. In case you’re not familiar with the term "codemod", here’s how it was originally defined AFAICT: > Codemod is a tool/library to assist you with large-scale codebase refactors Codemods are awesome, but I felt they were far from their potential, and so I’m very proud to show you all an early version of a codemod library we’ve built called Codemodder (https://codemodder.io) that we think moves the "field" forward. Codemodder supports both Python and Java (https://github.com/pixee/codemodder-python and…
Codemodder – A new codemod library for Java and Python launched on January 23, 2024 with 37 votes, #896 of 4,437 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Codemodder is a library for large-scale codebase refactoring that works with both Java and Python. It takes a different approach from traditional codemod tools by separating the logic for finding code from the logic for changing it. The tool is designed to help developers automate repetitive code modifications across large projects, making refactoring tasks more efficient and scalable.
written from the facts on this page · September 2026
From the sources
Codemodder is a pluggable framework for building expressive codemods. Previous codemod libraries allow for building cool stuff, but they were all missing key features that would allow more expressive and impactful code changes.
In the maker’s words, at launch
Hi HN, I’m here to show you a new codemod library. In case you’re not familiar with the term "codemod", here’s how it was originally defined AFAICT: > Codemod is a tool/library to assist you with large-scale codebase refactors Codemods are awesome, but I felt they were far from their potential, and so I’m very…
Does a similar job
all alternatives →
Codemap – Codebase Visualizer for JavaScript, TypeScript, and Python2020 · codemap.app · ▲84Codemap visualizes any codebase as a graph for software engineers to quickly understand the code architecture. Supports Typescript, Python, Java, PHP, Ruby, Go (Golang), and Terraform.
Refurb – A tool for refurbishing and modernizing Python codebases2022 · github.com · ▲123A tool for refurbishing and modernizing Python codebases - dosisod/refurb
Codewich – A live-updating TypeScript/CSS/HTML playground2017 · codewich.com · ▲114Create and share simple web demos using TypeScript, CSS, and HTML. Prototype new ideas quickly.
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