Resolved integration issues between FastAPI and Next.js

2 min read

📅 2025-11-16 — Session: Resolved integration issues between FastAPI and Next.js

🕒 21:05–22:20
🏷️ Labels: Fastapi, Next.Js, Integration, Chroma, Frontend, Backend
📂 Project: Dev

Session Goal

The goal of this session was to address and resolve various integration issues between a FastAPI backend and a Next.js frontend, ensuring smooth operation and communication between the two frameworks.

Key Activities

  • Resolving Import Collision: Addressed import collision issues when running a FastAPI application alongside a Next.js frontend by reorganizing the project structure.
  • Setting Up Next.js with FastAPI: Configured the Next.js frontend to work seamlessly with the FastAPI backend, including the setup of CORS and necessary configurations in package.[[json]].
  • Fixing npm dev script issue: Resolved an error related to a missing ‘dev’ script in the frontend’s package.[[json]] by adding the script or creating a new package.[[json]].
  • Troubleshooting SWR in Next.js: Provided a checklist for resolving common issues with the SWR package in Next.js, ensuring proper installation and configuration.
  • Backend and Frontend Integration Fixes: Diagnosed and fixed integration issues such as SWR import errors, API endpoint mismatches, and CORS configuration.
  • Frontend and Backend Integration for Paper Retrieval: Implemented SWR in the frontend and a CSV fallback in the backend to ensure a functional UI during backend development.
  • Chroma Client Error Fix and Code Patch: Addressed a validation error in the Chroma client call with code patches and testing instructions.
  • Next.js Frontend Implementation Plan: Outlined a plan for integrating a Next.js frontend with a Chroma vector store backend, detailing MVP features and setup.

Achievements

  • Successfully resolved multiple integration and configuration issues between FastAPI and Next.js.
  • Established a working setup for both frontend and backend with CORS and SWR properly configured.
  • Developed a robust plan for integrating Chroma into the frontend, enhancing the application’s capabilities.

Pending Tasks

  • Further testing of the integration setup to ensure stability and performance.
  • Implementation of additional features as outlined in the MVP plan for the Next.js frontend.

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