openapi-to-typescript

name	openapi-to-typescript
description	Converts OpenAPI 3.0 JSON/YAML to TypeScript interfaces and type guards. This skill should be used when the user asks to generate types from OpenAPI, convert schema to TS, create API interfaces, or generate TypeScript types from an API specification.

OpenAPI to TypeScript

Converts OpenAPI 3.0 specifications to TypeScript interfaces and type guards.

Input: OpenAPI file (JSON or YAML) Output: TypeScript file with interfaces and type guards

When to Use

• "generate types from openapi"
• "convert openapi to typescript"
• "create API interfaces"
• "generate types from spec"

Workflow

1. Request the OpenAPI file path (if not provided)
2. Read and validate the file (must be OpenAPI 3.0.x)
3. Extract schemas from components/schemas
4. Extract endpoints from paths (request/response types)
5. Generate TypeScript (interfaces + type guards)
6. Ask where to save (default: types/api.ts in current directory)
7. Write the file

OpenAPI Validation

Check before processing:

- Field "openapi" must exist and start with "3.0"
- Field "paths" must exist
- Field "components.schemas" must exist (if there are types)

If invalid, report the error and stop.

Type Mapping

Primitives

OpenAPI	TypeScript
string	string
number	number