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codable-patterns

Encode and decode Swift types to JSON and property lists with Codable.

981|50|Updated Mar 3, 2026
Search Tags:#json#swift#encoding#decoding#codable#data serialization#api parsing
One-click install
npx skills add https://github.com/dpearson2699/swift-ios-skills --skill codable-patterns-dpearson2699
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: codable-patterns
Source: https://github.com/dpearson2699/swift-ios-skills/tree/main/skills/codable-patterns
Command: npx skills add https://github.com/dpearson2699/swift-ios-skills --skill codable-patterns-dpearson2699

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill simplifies the process of encoding and decoding Swift data types to and from various external formats like JSON and property lists, making data serialization and deserialization straightforward.

Core Features & Use Cases

  • JSON Encoding/Decoding: Effortlessly convert Swift objects to JSON and vice-versa using JSONEncoder and JSONDecoder.
  • Custom Key Mapping: Handle API responses with different key naming conventions (e.g., snake_case to camelCase) using CodingKeys.
  • Data Transformation: Implement custom logic for encoding and decoding complex data types or handling missing values.
  • Configuration Options: Customize output formatting, date strategies, and key strategies for flexible data handling.
  • Use Case: Parse a complex JSON API response into strongly-typed Swift objects, handling nested structures, custom date formats, and remapped keys.

Quick Start

Use the codable-patterns skill to decode the provided JSON data into a Swift User struct, ensuring that snake_case keys from the JSON are mapped to camelCase properties in the struct.

Frequently Asked Questions about codable-patterns

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I decode JSON with snake_case keys into Swift structs using camelCase properties?▼

Swift Codable decoding handles snake_case to camelCase mapping by defining custom CodingKeys within your struct or configuring the keyDecodingStrategy on JSONDecoder to automatically convert API response keys.

How do I decode heterogeneous arrays in a JSON API response using Swift Codable?▼

Decoding heterogeneous arrays with Swift Codable requires implementing a custom init(from:) decoder method to inspect and route specific JSON payloads to their correct Swift types during data serialization.

Can I use Swift Codable to handle nested or flattened JSON structures?▼

Swift Codable supports both nested and flattened JSON structures by utilizing custom encoding and decoding methods to transform complex data hierarchies into flat Swift object properties.

Does Swift Codable integrate with URLSession and UserDefaults for data persistence?▼

Swift Codable integrates directly with URLSession for API parsing and with UserDefaults for local data persistence, allowing seamless encoding and decoding of Swift types to JSON and property lists.

How do I customize date and data decoding strategies in Swift JSONDecoder?▼

Swift JSONDecoder provides configuration options to customize date and data decoding strategies, ensuring accurate parsing of complex data formats from external API responses into Swift objects.

What is the best way to handle missing values during Swift Codable data serialization?▼

Handling missing values during Swift Codable data serialization involves implementing custom init(from:) logic to safely decode optional properties or supply default values for incomplete JSON structures.

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