I started a webui container and then I started to get this error in OpenWebUI interface.

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

  • latest Ollama on windows
  • latest Open WebUI in docker desktop

according to a post online, I should set ENABLE_WEBSOCKET_SUPPORT=True in my docker compose, but I’m not using reverse proxy. Is ENABLE_WEBSOCKET_SUPPORT=True necessary?

What could a possible solution be for this?

My docker compose

services:
  open-webui:
    image: ghcr.io/open-webui/open-webui:cuda 
    container_name: open-webui
    restart: unless-stopped
    ports:
      - "3000:8080"
    extra_hosts:
      - "host.docker.internal:host-gateway"
    volumes:
      - ./data:/app/backend/data
    deploy:
      resources:
        reservations:
          devices:
            - driver: nvidia
              count: all
              capabilities: [gpu]
volumes:
  open-webui:

log

2025-06-21 10:43:57 open-webui  | 2025-06-21 00:43:57.601 | INFO     | uvicorn.protocols.http.httptools_impl:send:476 - 172.21.0.1:37276 - "GET /_app/version.json HTTP/1.1" 304 - {}
2025-06-21 10:44:58 open-webui  | 2025-06-21 00:44:58.114 | INFO     | uvicorn.protocols.http.httptools_impl:send:476 - 172.21.0.1:49064 - "GET /_app/version.json HTTP/1.1" 304 - {}
2025-06-21 10:45:58 open-webui  | 2025-06-21 00:45:58.779 | INFO     | uvicorn.protocols.http.httptools_impl:send:476 - 172.21.0.1:55958 - "GET /_app/version.json HTTP/1.1" 304 - {}
2025-06-21 10:46:59 open-webui  | 2025-06-21 00:46:59.179 | INFO     | uvicorn.protocols.http.httptools_impl:send:476 - 172.21.0.1:47424 - "GET /_app/version.json HTTP/1.1" 304 - {}

UPDATE:

  • when I open http://localhost:3000/ in another browser it works perfectly fine. I think the issue is about the browser I used (firefox with a lot extension installed and setting tweaked)

UPDATE 2: The problem is with this plugin https://addons.mozilla.org/en-US/firefox/addon/chameleon-ext/ Everything works fine with it disabled.

The reason my chameleon breaks openwebui is because I changed a setting in it that it blocks all websocket connection

Thank you everyone for your help

  • chrash0@lemmy.worldEnglish
    0·
    2 days ago

    i would start by seeing what the actually API response is. i haven’t used OpenWebUI, but to me this looks like some kind of error response from the server. you could use an API tester like Bruno. also check your Ollama logs to see if it’s getting the request and any other output there.