Add a /generatepostman command for generating Postman collection + environment from backend code

[muhammedfurkan]

Summary

I’m proposing a new Copilot Chat command for VS Code:

/generatepostman

When triggered, Copilot analyzes the backend project (controllers, routes, handlers, DTOs, models, validation rules) and automatically generates:

• postman.collection.json
• postman.environment.json

Both files should be ready-to-import into Postman.

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Why this is useful

Backend developers repeatedly need to:

• Recreate Postman collections from scratch
• Manually update routes after refactors
• Share testable API endpoints with teammates
• Provide newcomers with something they can “hit” immediately

This is repetitive, slow, and error-prone — but Copilot already understands backend code extremely well.
A dedicated /generatepostman command would turn that understanding into instant documentation + tooling.

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Desired behavior

When the user types: /generatepostman

Copilot Chat should:

1. Scan the selected folder or project:

   • Detect frameworks (Express, NestJS, FastAPI, Django REST, Spring Boot, ASP.NET Core, Go Gin, etc.)
   • Find all HTTP endpoints:
     • Method
     • Path
     • Query params
     • Body schema
     • Expected responses (if inferable)

2. Generate a valid Postman Collection v2.1:

   • Group requests by resource
   • Insert example payloads based on DTO/model definitions
   • Use environment variables (e.g., {{baseUrl}}, {{authToken}})

3. Generate a Postman Environment:

   • Name: Local or Development
   • Variables:
     • baseUrl
     • authToken
     • Optional extras inferred from code (API keys, tenant IDs, etc.)

4. Output two code blocks:

   • postman.collection.json
   • postman.environment.json

Both should be valid and directly saveable.

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Example usage flow

Developer opens Copilot Chat in VS Code
→ Types: /generatepostman
→ Copilot asks: “Which folder should I scan?”
→ Developer selects the backend project root
→ Copilot outputs two JSON files
→ Developer saves them into /postman/