JSON ↔ Swift Converter

Paste JSON to generate Swift 5.5+ Codable structs, or paste a Swift struct to generate sample JSON test data. Everything runs locally in your browser — nothing is uploaded:

JSON → Swift (Codable): infers types automatically (String / Int / Double / Bool / arrays / nested objects), generates CodingKeys for snake_case conversion and supports nested structs and arrays.
Swift → Sample JSON: parses struct property names and types to produce sensible sample values (including nested structs), handy for building Codable test fixtures.
Dual language output: switch between Swift structs and Objective-C @property declarations.
Snake-case toggle: snake_case ⇄ camelCase, automatically deciding whether CodingKeys are needed.
One-click copy / clear / load sample.

Root struct name Snake case / snake_case (generate CodingKeys)

Code style JSON indent Swift indent Swift kind Optional

Input (JSON)

Output

Tip: click "JSON → Swift" to convert the JSON on the left; click "Swift → Sample JSON" to turn the Swift struct on the left into sample JSON. The Objective-C tab only applies to JSON → Swift.

JSON ↔ Swift Converter

Trending Tags