Convert YAML to TypeScript online, free. YAML is an indentation-based superset of JSON favoured for human-edited config. TypeScript interfaces give compile-time types for data crossing your app. YAML to TypeScript 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 TypeScript types as interfaces with optional members following the TypeScript Handbook 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 typed API clients, React/Next.js props and shared front/back types.
It maps the full structure of your YAML onto idiomatic TypeScript types, following the TypeScript Handbook 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 TypeScript types from TypeScript 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 TypeScript, 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 TypeScript equivalent:
YAML input:
label: web
replicas: 3
exposed: falseOutput:
interface Service {
label: string;
replicas: number;
exposed: boolean;
}Paste your YAML into the editor and press "Convert to TypeScript". The tool parses it against the YAML 1.2.2 grammar, then generates TypeScript types following TypeScript Handbook 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 TypeScript 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 TypeScript are inferred from keys missing in some records of your YAML, following TypeScript Handbook. 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. TypeScript interfaces (TypeScript) — TypeScript interfaces give compile-time types for data crossing your app. This converter maps the structure of your YAML onto TypeScript so you can use it for typed API clients.
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 TypeScript accurate.
Yes. The entire YAML-to-TypeScript 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 TypeScript is ready for typed API clients, React/Next.js props and shared front/back types. Copy or download it and drop it straight into your codebase.
We use cookies for analytics and personalized ads to help keep these tools free. Until you accept, ads stay non-personalized and analytics cookies are off. See our Privacy Policy.