Cursor
api
API Endpoint Type Mismatch After Cursor TypeScript Update
After Cursor refactored your API endpoint code, TypeScript errors report type mismatches between client requests and server responses. The endpoint signatures don't match what the client is sending.
Type definitions or interfaces were likely modified incorrectly during refactoring.
Error Messages You Might See
Property 'name' does not exist on type 'Request'
Type 'string' is not assignable to type 'number'
Argument of type '{}' is not assignable
Cannot find module or type
Common Causes
- Request body interface changed, field names or types modified
- Response type removed optional marker (? or | null)
- Endpoint parameter types changed (string vs number)
- Generic types
used incorrectly after refactoring - Type imports removed or aliased to wrong types
How to Fix It
Compare client request type with server endpoint parameter type. Use TypeScript strict mode to catch issues: strict: true in tsconfig.json. Export types from shared location both use. Run tsc --noEmit to check types. Use VSCode quick fixes (Ctrl+.).
Real developers can help you.
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BurnHavoc
Been around fixing other peoples code for 20 years.
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Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews.
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I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
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You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
How do I share types between client and server?
Create shared types package or folder. Import on both sides. Or generate types from OpenAPI/GraphQL schema.
What's type narrowing?
Checking to determine exact type: typeof x === 'string' ? x.length : x.value. Helps TypeScript understand type at different code paths.