Hi,
Where do you want to run the app with socket.io (which programming language?)

i want to send data from the esp32 to a nodejs server   and display the data on a web page
i try to run the libray socketio but it doesn t work.  i thought it would be great if we had a module on that .

i’m on it since on week. i tought yo guys could have an idea

At the moment, I don’t have tutorial on that exact subject. The easiest way is to establish an MQTT connection with a NodeJS app…
You might also try to look into this project: techtutorialsx.com/2017/11/03/esp32-arduino-websocket-server/