Claude Code
api
API Response Structure Doesn't Match Frontend Expectations
API endpoint returns data in a different structure than the frontend expects. Frontend code calls API successfully but crashes when trying to access expected properties that don't exist or are nested differently.
This common integration problem surfaces when frontend and backend are developed independently without coordinating on response format.
Error Messages You Might See
TypeError: Cannot read property 'fullName' of undefined
Frontend expects array but API returns object
Property mismatch after API response received
Common Causes
- Backend returns object with wrong property names (user.full_name vs user.fullName)
- Response nested differently (data.user vs user at top level)
- Backend returns null where frontend expects object or array
- API returns camelCase but frontend expects snake_case or vice versa
- Array vs single object mismatch (returning [item] when expecting item)
How to Fix It
Define shared API contracts (Swagger/OpenAPI). Frontend and backend developers agree on response format before implementation. Use TypeScript interfaces for response types. Map response data before using: const user = mapApiResponse(response). Log actual response to see structure. Consider API response transformer layer.
Real developers can help you.
zipking
I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify.
As an INFJ-T, I approach development with a "systems-thinking" mindset—balancing technical precision with a deep understanding of user needs. I particularly enjoy the challenge of architecting Vertical AI SaaS and optimizing Small Language Models (SLMs) to solve specific, real-world business problems. Whether I'm in a CTO-level leadership role or hands-on with the code, I thrive on building tools that turn complex data into actionable value.
Antriksh Narang
5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
Tejas Chokhawala
Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript.
Focused on performance, clean architecture and shipping fast.
Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools.
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals.
I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software.
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
BurnHavoc
Been around fixing other peoples code for 20 years.
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 to prevent response mismatches?
Define API contract before coding. Use Swagger/OpenAPI specification. Generate types automatically from spec.
Should responses use camelCase or snake_case?
Consistent within your API. Recommend camelCase for JSON (JavaScript convention). Document in API spec.
How to handle null responses?
Be explicit: return 404 for not found, 400 for invalid input. Return 200 with data structure (even if fields are null) consistently.