swift-codable-json

What problem does it solve?

Codable provides strong typing for JSON parsing but APIs often return mismatched or nested data, date formats vary, and keys use snake_case. This skill guides you in designing robust Swift models that decode API responses reliably and fail gracefully when data is missing or malformed.

Core Features & Use Cases

• Handle snake_case to camelCase mappings with CodingKeys for every renamed property, ensuring stable decoding across API versions.
• Decode nested JSON structures into flat, strongly-typed Swift models using nested containers and CodingKeys.
• Manage multiple date formats in the same response with custom decoding logic or dedicated date properties, improving resilience in real-world APIs.
• Provide safe optional fields with decodeIfPresent and sensible defaults to prevent runtime crashes.
• Use clear, testable error handling patterns to surface decoding failures with actionable diagnostics.

Quick Start

Define a Codable model, customize keys as needed, and decode from JSON data. For example, create a struct matching the API, implement a CodingKeys enum or a custom init(from:), and then use JSONDecoder().decode(YourModel.self, from: jsonData) to obtain a typed instance.