Error trying to running Express and Vue concurrently

Question

My Vue app runs on port 8080. The setting of scripts: "serve": "vue-cli-service serve" and I start it up with yarn run serve.

My express server is set to run on port 4000. I start it up with yarn run dev with this scripts:

"client-install": "yarn add --prefix client",
"start": "node server.js",
"server": "nodemon server.js",
"client": "yarn start --prefix client",
"dev": "concurrently \"yarn run server\" \"yarn run client\""

while I try to run, it displays an error:

Answer 1

this problem's solve by using npm package called concurrently