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.
Generation runs entirely in your browser — nothing is sent to a server, so it's safe with private config or secrets. The generated types work with any TypeScript project. 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
Copy your YAML and paste it into the left editor. You can also click Upload to load a .yaml or .yml file. The Sample button loads example data. Invalid YAML will show an error.
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. Generation runs entirely in your browser using JavaScript. No YAML or generated code is sent to any server — you can verify this in your browser's Network tab.
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.