Cursor
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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.
Matthew Jordan
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Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting.
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I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
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Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004).
Day job: I'm the sole backend developer at merketing company where I own and maintain 11 PHP/Symfony microservices on AWS (ECS Fargate, RDS, S3, CloudFront), handle the full CI/CD pipeline (Bitbucket Pipelines, Docker), and manage monitoring with Sentry and CloudWatch. These services handle high request volumes in production every month.
What I bring to AI-built apps:
- I audit and fix security issues (OWASP methodology), performance bottlenecks, and architectural problems in codebases generated by Cursor, Claude Code, Lovable, Bolt, and v0
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Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code.
Based in Poland (CET timezone). Available for async work and calls during EU/US business hours.
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.