Free YAML to TypeScript Converter Online
Generate TypeScript interfaces from YAML free in your browser — no signup, browser-only.
YAML Input
TypeScript Output
What Is YAML to TypeScript?
You're loading a YAML config file in Node.js — maybe a config.yml, a Kubernetes manifest, or a GitHub Actions workflow — and you're getting any types everywhere. Manually writing TypeScript interfaces for deeply nested YAML is slow and error-prone. This tool reads your YAML 1.2 document and generates TypeScript interfaces you can drop straight into your project. Use them with js-yaml or the yaml npm package to get typed config objects with autocomplete and compile-time safety.
The interfaces are generated on this page without a server round trip, so a private config or a file with secrets in it is fine to paste. What comes out is plain TypeScript that any project can import. For JSON to TypeScript, use JSON to TypeScript.
YAML to TypeScript Examples
Generate TypeScript interfaces from YAML. Telecom-themed example:
Example: Subscriber record
TypeScript Output:
Click the Sample button above to load more examples into the editor.
How to Use This Tool
Paste or Upload YAML
Paste the YAML you want typed into the left editor, or open a .yaml or .yml file with Upload. Sample gives you a config to generate interfaces from, and YAML that fails to parse produces an error instead of types.
Copy or Download
Use Copy or Download. For JSON to TypeScript, use JSON to TypeScript. For YAML formatting, use YAML Formatter.
When YAML to TypeScript Helps
When building Node.js or frontend apps that load YAML config (e.g. config.yml, Kubernetes manifests, or CI workflows), you need typed structures for the parsed data. Pasting a sample here gives you TypeScript interfaces you can use with js-yaml or the yaml package. Manually writing types for complex nested YAML is tedious; this tool infers the structure from your sample.
Config files like application.yml or GitHub Actions workflows often have deep nesting. The generated types help catch typos and provide autocomplete in your IDE. For pulling out specific values from large YAML, convert to JSON first and use jq.
Frequently Asked Questions
How do I use generated TypeScript types to parse YAML?
Install js-yaml or the yaml npm package. Then: const config = yaml.parse(str) as MyConfig. For runtime validation beyond type casting, add Zod or io-ts to validate the actual shape.
What is the difference between js-yaml and the yaml npm package?
js-yaml is widely used and battle-tested. The yaml package has a different API, better comment preservation, and stricter YAML 1.2 compliance. Both work with the generated interfaces.
Is my YAML data private when generating TypeScript?
Yes. The interfaces are inferred by JavaScript on this page, so neither your YAML nor the TypeScript it produces travels over the network. DevTools' Network tab will confirm that.
How do I handle optional vs required fields in YAML interfaces?
The generator infers from your sample data. Add ? to interface properties for fields that may not always be present. For strict runtime validation, use Zod schemas derived from the generated types.
Can I use YAML-generated TypeScript types with Angular or React?
Yes. The generated interfaces work in any TypeScript project — Angular services, React hooks, or plain Node.js scripts. Load your YAML at build time with a bundler or at runtime, then cast to the generated interface.