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codable-patterns

Encodes and decodes Swift Codable types to and from JSON and property lists.

3|Updated Mar 13, 2026
Search Tags:#json#swift#encoding#decoding#codable#data serialization
One-click install
npx skills add https://github.com/andrew-d/claude-skills --skill codable-patterns-andrew-d
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: codable-patterns
Source: https://github.com/andrew-d/claude-skills/tree/main/plugins/swift-ios-skills--swift-core-skills/skills/codable-patterns
Command: npx skills add https://github.com/andrew-d/claude-skills --skill codable-patterns-andrew-d

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill simplifies the process of converting Swift data structures to and from external formats like JSON, Property Lists, and other representations, making data handling in your Swift applications robust and efficient.

Core Features & Use Cases

  • JSON Encoding/Decoding: Effortlessly convert Swift Codable types to and from JSON data.
  • Custom Key Mapping: Use CodingKeys to map Swift properties to different JSON key names.
  • Data Transformation: Implement custom init(from:) and encode(to:) for complex data transformations.
  • Nested Structures: Handle deeply nested JSON objects and arrays with ease.
  • Date & Data Formatting: Configure strategies for decoding dates, data, and keys.
  • Use Case: Parse complex API responses, save user preferences using UserDefaults, or integrate with URLSession for seamless data transfer.

Quick Start

Decode the provided JSON data into a Swift User struct using JSONDecoder.

Frequently Asked Questions about codable-patterns

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

FAQPage Schema
How do I map different JSON key names to Swift Codable properties?▼

Use custom CodingKeys to remap JSON keys to Swift Codable properties, remapping the expected JSON keys to your Swift property names.

What is the best way to decode nested or flattened JSON structures in Swift?▼

The best way to decode nested or flattened JSON structures in Swift is by implementing custom init(from:) or encode(to:) methods to handle complex data transformations during the Codable encoding and decoding process.

How do I configure date decoding strategies when parsing JSON with JSONDecoder?▼

Configure date decoding strategies when parsing JSON with JSONDecoder by applying specific date formatting strategies to the decoder, ensuring dates and data are accurately parsed from the external representation into Swift.

Can I use Swift Codable with URLSession to parse API responses?▼

Yes, you can integrate Swift Codable with URLSession to parse API responses, using JSONDecoder to seamlessly convert retrieved JSON data into Swift types.

How do I handle heterogeneous arrays in Swift Codable decoding?▼

Handle heterogeneous arrays in Swift Codable decoding by implementing custom init(from:) logic or using lossy array wrappers to safely skip invalid elements without failing the entire decoding process.

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