How to Catch Code Duplication Across 100 Repositories

Code duplication in large codebases is a systemic issue that extends beyond simple copy-pasting, manifesting as exact, near, and semantic duplications often hidden within service integrations, validation logic, and shared utilities across repositories. AI-assisted development exacerbates the problem by generating code that replicates existing logic without recognizing shared libraries, while current CI/CD pipelines fail to detect these overlaps. Duplication should be identified during pull request reviews, as merging duplicated logic can lead to long-term technical debt. Qodo addresses this by detecting and highlighting duplication across repositories during code reviews, allowing teams to reuse or consolidate logic before it becomes a production risk. The tool analyzes changes with cross-repository context, helping to prevent the propagation of duplicated logic, which often becomes apparent during incidents when bugs fixed in one place persist elsewhere. By surfacing existing implementations and semantic duplications at review time, Qodo enables teams to manage duplication proactively, ensuring software remains understandable and easier to maintain as systems grow.

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