PostgreSQL's JSON Key Validation Challenge: Understanding and Solving Duplicate Key Errors

PostgreSQL Error 22030 reflects a fundamental tension between data sources that permit duplicate JSON keys and PostgreSQL's strict jsonb validation—a critical pain point for developers integrating legacy systems and APIs. Understanding the three main failure modes (dynamic object construction, external data import, and aggregation functions) is essential for anyone building production data pipelines. Mastering normalization techniques directly improves system reliability, reduces runtime failures, and enables confident handling of messy real-world data.