graph TD A[Start: Receive JSON] --> B{JSON Input Handler} B --> C[Parse Input JSON] C --> D{Validation Check} D -->|Invalid| E[Fix JSON Structure] D -->|Valid| F[Return Original] E --> G[Apply Format Rules] G --> H[Verify Fields] H --> I{Field Check} I -->|Missing Fields| J[Add Required Fields] I -->|Fields OK| K[Format Output] J --> K F --> K K --> L[Final JSON Output] L --> M[End: Return Validated JSON] subgraph JSON_Validation D E G H I J end style JSON_Validation fill:#f9f,stroke:#333,stroke-width:2px