Missing API Response Types

[RUKAYAT-CODER]

Description

Overview
API routes return untyped responses. No TypeScript interfaces defined for request/response bodies.

Background
API routes in src/app/api/ use inline typing or no typing at all.

Specifications

• Define request/response DTOs
• Use Zod for validation

Tasks:

• Create types/api directory with DTOs
• Add Zod schemas for request validation
• Type API route handlers

Impacted Files:

• src/app/api/courses/route.ts
• src/app/api/courses/[id]/route.ts
• src/app/api/notes/route.ts
• src/app/api/bookmarks/route.ts
• src/app/api/auth/login/route.ts
• src/app/api/auth/signup/route.ts

Labels: frontend, api, typescript, priority-high

Acceptance Criteria
Fully typed API responses with validation

🙆Contribution Guidelines:
Assignment required before PR submission
Timeframe: 48-72 hours
PR description must include: Close #issue no
Star the repo⭐

[Thosine-01]

@Thosine-01 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi! I’d love to lead the effort to bring strict type safety and schema validation to your API routes. I have extensive experience building robust Next.js backends where the goal is to eliminate runtime "undefined" errors through a combination of TypeScript and Zod. I’ll start by architecting a centralized types/api directory that serves as the blueprint for all your request and response shapes.

I will implement Zod validation across your auth, course, and content routes, ensuring that every incoming payload is strictly verified before it ever reaches your business logic. My plan includes refactoring your route handlers to return fully typed NextResponse objects, providing your frontend with instant IntelliSense and compile-time safety. I’ll also focus on clear error reporting, so the client receives helpful feedback if a validation check fails.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Thosine-01 to this issue.

[rachealkenny]

@rachealkenny has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi Able Maintainer! I would like to work on issue #113 to fully type all API responses across the specified route files by creating DTOs and Zod schemas in a types/api directory, and I will adhere to the 48-72 hour timeframe and include Close #113 in the PR description once assigned.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @rachealkenny to this issue.

[drips-wave]

Congratulations, @Thosine-01! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Thosine-01: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @Thosine-01 as part of the Stellar Wave Program's 4th Wave 🥳

😎 @Thosine-01: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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