Convert YAML to Dart online, free. YAML is an indentation-based superset of JSON favoured for human-edited config. Null-safe Dart classes model data for Flutter apps and Dart services. YAML to Dart 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 Dart types following the Dart language tour 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 Flutter mobile apps, Dart backends and JSON model classes.
It maps the full structure of your YAML onto idiomatic Dart types, following the Dart language tour 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 Dart types from Dart 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 Dart, 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 Dart equivalent:
YAML input:
label: web
replicas: 3
exposed: falseOutput:
class Service {
final String label;
final int replicas;
final bool exposed;
Service({required this.label, required this.replicas, required this.exposed});
}Paste your YAML into the editor and press "Convert to Dart". The tool parses it against the YAML 1.2.2 grammar, then generates Dart types following Dart language tour 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 Dart 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 Dart are inferred from keys missing in some records of your YAML, following Dart language tour. 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. Dart classes (Dart) — Null-safe Dart classes model data for Flutter apps and Dart services. This converter maps the structure of your YAML onto Dart so you can use it for Flutter mobile 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 Dart accurate.
Yes. The entire YAML-to-Dart 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 Dart is ready for Flutter mobile apps, Dart backends and JSON model classes. 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.