Guides Swift 6.x Codable conformance for JSON and PropertyList encoding and decoding.
npx skills add https://github.com/CharlesWiltgen/Axiom --skill codable
Please help me install this Agent Skill. Skill: codable Source: https://github.com/CharlesWiltgen/Axiom/tree/main/.claude-plugin/plugins/axiom/skills/codable Command: npx skills add https://github.com/CharlesWiltgen/Axiom --skill codable
Comprehensive patterns for Codable conformance: JSON and PropertyList encoding/decoding, CodingKeys customization, enum encoding, and dealing with common Decodable/Encodable errors in Swift 6.x.
Decode a JSON payload into a Swift struct using automatic synthesis and CodingKeys.
High-intent search queries and answers about installing and using this skill.
Swift automatically synthesizes Codable conformance when all properties in a struct conform to Codable. Simply declare the struct as `Codable` and the compiler generates init(from:) and encode(to:) methods without additional code, supporting JSON and PropertyList formats.
CodingKeys customization is needed when JSON field names don't match Swift property names or you want to exclude properties from encoding/decoding. Define a CodingKeys enum inside your type listing each property with its corresponding JSON key string.
Manually implement init(from:) and encode(to:) using keyed containers to encode the enum case and its associated values separately. For raw-value enums, automatic synthesis works if all raw values conform to Codable; associated-value enums require custom implementations.
Common errors include type mismatches, missing keys, and unexpected null values. Debug by checking JSON structure matches property types, verify CodingKeys spelling, use dateDecodingStrategy for date fields, and handle optional properties or provide default values for missing keys.
Yes. Any type conforming to Codable works with both JSONEncoder/JSONDecoder and PropertyListEncoder/PropertyListDecoder. The same Codable implementation handles both formats without modification; only the encoder/decoder type changes.
Set dateDecodingStrategy and dateEncodingStrategy on JSONEncoder/JSONDecoder to control date formatting. For custom types, implement Codable manually or use container methods to encode/decode nested structures as intermediate types then transform them.
dagbaDecode and encode Swift JSON with Codable and CodingKeys.
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pradeepmouliEncode and decode JSON in Swift 6 with Codable patterns.
