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JSON Toolbox- Free online JSON tools

JSON to Swift

Convert JSON to Swift Codable structs online. Types are inferred for nested objects and arrays — and everything runs in your browser.

  • 100% client-side, nothing uploaded
  • Instant results
  • Works offline once loaded
Input JSON

Empty

Swift output

Empty

How it works

About this tool

This free online JSON to Swift generator turns a sample JSON payload into Swift Codable structs. Paste a representative response, set a root type name, and the tool infers a type for every field — including nested objects and array elements.

Structs conform to Codable so they work with JSONDecoder out of the box. Optional and nullable fields use Swift optionals, and a CodingKeys enum is generated when a property name needs to differ from the JSON key.

Speeds up iOS / macOS model scaffolding when you already have a JSON fixture from an API or mock server.

Generation runs entirely in your browser. Your JSON is never uploaded or stored, so it is safe to use with production API responses and payloads that contain sensitive data.

JSON Toolbox processes all data locally in the browser. Nothing is uploaded to a server.

Common questions

Frequently asked questions

How do I convert JSON to Swift?
Paste your JSON into the input editor and the generated Swift code appears on the right. Set a root type name to control what the top-level type is called, then copy or download the result.
Does it handle nested objects and arrays?
Yes. Nested objects become their own named types, and arrays are typed by their element. When objects in an array have slightly different shapes, their fields are merged and any field missing from some items is marked optional.
What should I know about the generated Swift code?
Date formats, custom decoding, and polymorphic payloads still need manual Codable implementations. Review optional vs non-optional fields against your API’s null guarantees.
Is my JSON uploaded anywhere?
No. The Swift code is generated locally in your browser. Nothing is sent to a server, logged, or stored — even for large or sensitive payloads.

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