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Postman Collection to OpenAPI 3.0 & MSW Builder Guide
When backend teams or QA engineers hand off Postman Collections (`.json` files) to frontend developers, creating API mock code for local frontend development or converting the specs to OpenAPI 3.0 (Swagger) YAML is a tedious manual task. This tool parses Postman v2.1 Collection JSON files 100% in your browser and automatically generates ready-to-use MSW (Mock Service Worker) v2 TypeScript handlers as well as OpenAPI 3.0 YAML specifications. Your internal API endpoints, body parameters, and secret headers remain 100% private because all parsing and code generation execute strictly within your local browser memory.
🔒Technical Specifications & Local Processing Architecture
All Postman collection parsing, MSW code scaffolding, and YAML generation run locally in your web browser JavaScript runtime.
✨ Core Capabilities
- •Parses Postman v2.1 Collection JSON format recursively.
- •Generates MSW (Mock Service Worker) v2 TypeScript handler code (`http.get`, `http.post`, `HttpResponse.json`).
- •Generates OpenAPI 3.0 (Swagger) YAML specification document.
- •100% Client-Side execution guarantees zero network leakage for proprietary internal API specs.
🚀 Step-by-Step Guide
- 1Paste your Postman v2.1 Collection JSON into the left panel or click "Load Sample Postman JSON".
- 2Switch between the MSW Code and OpenAPI 3.0 YAML tabs in the right panel.
- 3Click "Copy Code" to copy ready-to-use TypeScript mock handlers into your frontend codebase.