Sonar’s "The State of Code: Maintainability" report (July 2025) sheds light on common code maintainability issues, or "code smells," that impact software quality. Based on analyzing nearly 8 billion lines of code from over 970,000 developers worldwide, the report uncovers frequent weak points in code design that slow development, increase technical debt, and raise bug risks. It highlights issues like improper JavaScript variable declarations and tests lacking assertions, explaining why they matter and how Sonar helps detect and fix them early to improve code maintainability and team efficiency. This data-driven insight aids developers, leaders, and AppSec stakeholders.

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