Convert YAML to Ruby online, free. YAML is an indentation-based superset of JSON favoured for human-edited config. Ruby keyword-init Structs give lightweight, typed-by-convention value objects. YAML to Ruby 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 Ruby types following the Ruby Struct 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 Rails & Sinatra apps, API response objects and config and DTOs.
It maps the full structure of your YAML onto idiomatic Ruby types, following the Ruby Struct 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 Ruby types from Ruby 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 Ruby, 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 Ruby equivalent:
YAML input:
label: web
replicas: 3
exposed: falseOutput:
Service = Struct.new(:label, :replicas, :exposed, keyword_init: true)Paste your YAML into the editor and press "Convert to Ruby". The tool parses it against the YAML 1.2.2 grammar, then generates Ruby types following Ruby Struct 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 Ruby 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 Ruby are inferred from keys missing in some records of your YAML, following Ruby Struct. 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. Ruby structs (Ruby) — Ruby keyword-init Structs give lightweight, typed-by-convention value objects. This converter maps the structure of your YAML onto Ruby so you can use it for Rails & Sinatra 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 Ruby accurate.
Yes. The entire YAML-to-Ruby 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 Ruby is ready for Rails & Sinatra apps, API response objects and config and DTOs. Copy or download it and drop it straight into your codebase.
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