Convert YAML to Swift online, free. YAML is an indentation-based superset of JSON favoured for human-edited config. Swift Codable structs decode and encode JSON with compile-time safety. YAML to Swift conversion parses your YAML against the YAML 1.2.2 grammar (https://yaml.org/spec/1.2.2/), builds an in-memory model of its keys, nested objects and arrays, then emits ready-to-use Swift types following the Swift Codable conventions. Processing runs in your browser in JavaScript with no upload or server round-trip — no size limit beyond your device's memory, so multi-megabyte documents convert in milliseconds and sensitive payloads never leave your machine. Typical uses include iOS/macOS apps, Vapor services and API client models.
It maps the full structure of your YAML onto idiomatic Swift types, following the Swift Codable conventions. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.
Paste YAML and generate Swift types from Swift immediately. Conversion runs client-side, so there is no upload wait and large documents stay fast.
Nested YAML objects, tables and arrays are mapped faithfully onto Swift, including nested types and optional fields.
Your YAML never leaves your device — everything is processed locally in JavaScript, with nothing logged or stored.
Unlimited conversions with no account, no quotas, and no watermark. Works on desktop and mobile.
A YAML document and its Swift equivalent:
YAML input:
label: web
replicas: 3
exposed: falseOutput:
struct Service: Codable {
let label: String
let replicas: Int
let exposed: Bool
}Paste your YAML into the editor and press "Convert to Swift". The tool parses it against the YAML 1.2.2 grammar, then generates Swift types following Swift Codable conventions — instantly and entirely in your browser. You can validate or format the YAML first to be sure it is clean.
YAML anchors and aliases are expanded and comments are dropped before Swift is produced, and indentation defines the structure. Note that YAML 1.1 treats words like "yes" and "no" as booleans, so quote them if you want strings.
Optional or nullable members in the generated Swift are inferred from keys missing in some records of your YAML, following Swift Codable. Include the optional fields in your sample so they are typed correctly.
YAML (YAML Ain't Markup Language) (YAML) — YAML is an indentation-based superset of JSON favoured for human-edited config. Swift structs (Codable) (Swift) — Swift Codable structs decode and encode JSON with compile-time safety. This converter maps the structure of your YAML onto Swift so you can use it for iOS/macOS apps.
Yes. Invalid YAML is flagged with a clear error before anything is converted. Common YAML problems to check are spaces (never tabs) for indentation, consistent indent levels, and no duplicate keys. Starting from clean input keeps the generated Swift accurate.
Yes. The entire YAML-to-Swift conversion runs locally in your browser in JavaScript — your YAML is never uploaded, logged or stored. That matters when the data is something like Kubernetes & Docker Compose manifests, which should not leave your machine.
The generated Swift is ready for iOS/macOS apps, Vapor services and API client models. Copy or download it and drop it straight into your codebase.
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