Himotoki
A type-safe JSON decoding library purely written in Swift, focused on deserialization with a simple API.
What is Himotoki?
Himotoki is a type-safe JSON decoding library written purely in Swift, designed to parse JSON data into Swift models with compile-time safety. It solves the problem of error-prone JSON deserialization by providing a fail-fast, declarative approach to decoding, ensuring data integrity and reducing runtime crashes.
Swift developers building iOS, macOS, tvOS, watchOS, or Linux applications that consume JSON APIs and require robust, type-safe data parsing.
Developers choose Himotoki for its simplicity, lack of external dependencies, and focus on decoding-only functionality, offering a cleaner and more reliable alternative to more complex or dual-purpose JSON libraries.
Overview
A type-safe JSON decoding library purely written in Swift
Use Cases
Best For
- Parsing JSON APIs into Swift structs with non-optional properties
- Building type-safe model layers in Swift applications
- Implementing fail-fast JSON decoding to catch errors early
- Decoding nested JSON objects with deep key paths
- Transforming JSON values to custom types (e.g., URLs, dates)
- Swift projects requiring a lightweight, no-dependency JSON library
Not Ideal For
- Projects requiring both JSON encoding and decoding in a single library
- Teams preferring built-in Swift solutions like Codable for simplicity and official support
- Applications that need to handle partially valid JSON or continue parsing after errors
- Developers who dislike custom operators and want more explicit, verbose APIs
Pros & Cons
Pros
Ensures JSON maps correctly to Swift types with compile-time checks, reducing runtime errors as shown in the fail-fast error handling examples.
Dedicated solely to JSON decoding with a simple API, avoiding complexity from encoding features, which keeps the library lightweight and focused.
Immediately stops decoding on missing or invalid data, ideal for structs with non-optional properties, preventing incomplete model instances.
Written purely in Swift, making integration straightforward without relying on other libraries, as highlighted in the README.
Supports custom transformers to convert decoded values to non-Decodable types like URLs, enhancing parsing capabilities beyond basic types.
Cons
Deliberately excludes JSON serialization, forcing developers to use separate libraries for encoding tasks, which adds complexity to projects needing both.
Relies on operators like <| and <|| that can be cryptic and require learning, unlike more intuitive, explicit method calls found in other libraries.
Supports older Swift versions (e.g., Swift 4.2) and shows less recent activity, possibly lacking updates for newer Swift features or bug fixes.
Requires prefixing with 'Himotoki.Decodable' to avoid collisions with Foundation.Decodable, adding verbosity and potential confusion in code.
Frequently Asked Questions
Related Projects
SwiftyJSONThe better way to deal with JSON data in Swift.
MantleModel framework for Cocoa and Cocoa Touch
ObjectMapperSimple JSON Object mapping written in Swift
MJExtensionA fast, convenient and nonintrusive conversion framework between JSON and model. Your model class doesn't need to extend any base class. You don't need to modify any model file.
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