Actually, I am trying to set the REACT_APP_DEPLOY_DOMAIN variable automatically in .env file.

below is one method I tried to achieve the solution to this issue.

below is my script file in which I am getting my IP address

const os = require("os");

const networkInterfaces = os.networkInterfaces();
const ip = networkInterfaces["Wi-Fi"][1]["address"];

REACT_APP_DEPLOY_DOMAIN = `http://${ip}`;
console.log(`http://${ip}`);
return `http://${ip}`;

below is the env variable in .env file

REACT_APP_DEPLOY_DOMAIN =  http://192.168.1.114

And also I tried to update it from the start command but it is setting it as the exact command

    "start": "set REACT_APP_DEPLOY_DOMAIN=node ./src/components/getIp.js && react-scripts start",

And also my script file is not running when I try to run the below command.

"start": "node ./src/components/getIp.js && react-scripts start",