Blank frontend page after full project setup

[Darkstrouk]

Hi!

It seems to me I've properly setup both frontend and backend, started successfully backend (healt checks from /docs work), also started front but after opening http://localhost:3000/ - see nothing.

npm version - 10.7.0
Python version - 3.11
OS - MacOS on M2 Apple Silicon

What have I done step by step:

cloned project

backend:
cd src/backend/base
python -m venv venv
source venv/bin/activate
pip install uv
uv pip install langflow
python -m uvicorn --host 0.0.0.0 --port 7860 --factory langflow.main:create_app
...
INFO 2025-02-01 13:41:35 - INFO - init - Application startup complete. init.py:1706
INFO 2025-02-01 13:41:35 - INFO - init - Uvicorn running on http://0.0.0.0:7860/

frontend:
cd src/frontend
npm install
npm run build (done it in purpose to set path in .env)
npm start

[email protected] start
vite
VITE v5.4.14 ready in 1867 ms

➜ Local: http://localhost:3000/
➜ Network: use --host to expose
➜ press h + enter to show help

my .env file (just copied from example - nothing secret) :
LANGFLOW_CONFIG_DIR=~/.langflow
LANGFLOW_SAVE_DB_IN_CONFIG_DIR=true
LANGFLOW_DATABASE_URL=sqlite:///./langflow.db
LANGFLOW_DATABASE_CONNECTION_RETRY=false
LANGFLOW_LANGCHAIN_CACHE=SQLiteCache
LANGFLOW_HOST=127.0.0.1
LANGFLOW_WORKERS=1
LANGFLOW_PORT=7860
LANGFLOW_LOG_LEVEL=info
LANGFLOW_LOG_FILE=logs/langflow.log
LANGFLOW_FRONTEND_PATH=src/frontend/build/
LANGFLOW_OPEN_BROWSER=false
LANGFLOW_REMOVE_API_KEYS=false
LANGFLOW_CACHE_TYPE=memory
LANGFLOW_AUTO_LOGIN=true
LANGFLOW_SUPERUSER=<my_user_here>
LANGFLOW_SUPERUSER_PASSWORD=<my_user_pass_here>
LANGFLOW_STORE_ENVIRONMENT_VARIABLES=false
BACKEND_URL=http://localhost:7860/

I also have tried to check routes in .tsx files but saw just / should works well. So I really don't understand why I see nothing after opening http://localhost:3000/
Hope someone can point out a stupid mistake that I made :)

[dosubot[bot]]

Hey @Darkstrouk! I'm here to help you with your project setup. I can assist with bugs, questions, and becoming a contributor while you wait for a human maintainer. Let's take a look at the issue together!

A similar issue was reported and resolved in a closed thread. The suggested solution was to run make dev build=1 after some commits were pushed to the dev branch, which fixed the problem by making the proxy in vite.config.ts dynamic ^[1].

Additionally, since you are using MacOS with M2 Apple Silicon, ensure that the OBJC_DISABLE_INITIALIZE_FORK_SAFETY environment variable is set to "YES" to avoid errors when running Gunicorn, as this is a common issue on MacOS ^[2].

You might want to check if these solutions apply to your setup.

To continue talking to Dosu, mention @dosu.

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