Worked on the badges/shields repository to enhance license accuracy for PyPI packages by implementing support for PEP 639 license expressions. Focused on backend development using JavaScript, the work introduced the license_expression field to the PyPI service schema and prioritized SPDX license expressions for more precise parsing and display. This approach improved data validation and ensured that license information is correctly represented in both listings and downstream tooling. Tests were updated to reflect the new logic, supporting compliance and transparency requirements. The changes addressed the need for accurate license handling, contributing to more reliable API integration and data consistency across the platform.