How can I divide prod and dev version in create-react-app - reactjs

Question

I have an application on the react, when the build I want insert another path, how can this be done?
I have two files with paths that need to be changed
........................................................................................................................................
config.js
const config = {
url: 'http://45.86.181.235' // here
};
export default config;
package.json
{
"name": "celbine",
"version": "0.1.0",
"private": true,
"dependencies": {
"#babel/core": "7.5.5",
"#svgr/webpack": "4.3.2",
"#typescript-eslint/eslint-plugin": "1.13.0",
"#typescript-eslint/parser": "1.13.0",
"axios": "^0.19.0",
"babel-eslint": "10.0.2",
"babel-jest": "^24.8.0",
"babel-loader": "8.0.6",
"babel-plugin-named-asset-import": "^0.3.3",
"babel-preset-react-app": "^9.0.1",
"camelcase": "^5.2.0",
"case-sensitive-paths-webpack-plugin": "2.2.0",
"chart.js": "^2.8.0",
"classnames": "^2.2.6",
"css-loader": "2.1.1",
"dotenv-expand": "4.2.0",
"eslint": "^6.1.0",
"eslint-config-react-app": "^5.0.1",
"eslint-loader": "2.2.1",
"eslint-plugin-flowtype": "3.13.0",
"eslint-plugin-import": "2.18.2",
"eslint-plugin-jsx-a11y": "6.2.3",
"eslint-plugin-react": "7.14.3",
"eslint-plugin-react-hooks": "^1.6.1",
"file-loader": "3.0.1",
"font-awesome": "^4.7.0",
"fs-extra": "7.0.1",
"html-webpack-plugin": "4.0.0-beta.5",
"identity-obj-proxy": "3.0.0",
"is-wsl": "^1.1.0",
"jest": "24.8.0",
"jest-environment-jsdom-fourteen": "0.1.0",
"jest-resolve": "24.8.0",
"jest-watch-typeahead": "0.3.1",
"jwt-decode": "^2.2.0",
"mini-css-extract-plugin": "0.5.0",
"node-sass": "^4.12.0",
"optimize-css-assets-webpack-plugin": "5.0.3",
"parallax-js": "^3.1.0",
"pnp-webpack-plugin": "1.5.0",
"postcss-flexbugs-fixes": "4.1.0",
"postcss-loader": "3.0.0",
"postcss-normalize": "7.0.1",
"postcss-preset-env": "6.7.0",
"postcss-safe-parser": "4.0.1",
"raphael": "^2.3.0",
"react": "^16.9.0",
"react-addons-css-transition-group": "^15.6.2",
"react-addons-transition-group": "^15.6.2",
"react-app-polyfill": "^1.0.2",
"react-chartjs-2": "^2.7.6",
"react-dev-utils": "^9.0.3",
"react-dom": "^16.9.0",
"react-moment": "^0.9.6",
"react-notifications-component": "^2.1.0",
"react-raphael": "^0.9.0",
"react-redux": "^7.1.1",
"react-router-dom": "^5.0.1",
"react-transition-group": "^4.3.0",
"redis-commander": "^0.6.6",
"redux": "^4.0.4",
"redux-thunk": "^2.3.0",
"resolve": "1.12.0",
"resolve-url-loader": "3.1.0",
"sass-loader": "7.2.0",
"semver": "6.3.0",
"socket.io-client": "^2.2.0",
"style-loader": "1.0.0",
"styled-components": "^4.4.0",
"terser-webpack-plugin": "1.4.1",
"ts-pnp": "1.1.2",
"url-loader": "2.1.0",
"webpack": "4.39.1",
"webpack-dev-server": "3.2.1",
"webpack-manifest-plugin": "2.0.4",
"workbox-webpack-plugin": "4.3.1"
},
"scripts": {
"start": "node scripts/start.js",
"build": "node scripts/build.js",
"test": "node scripts/test.js",
"build-prod": "set PUBLIC_URL=production11 && node scripts/start.js",
"build1": "set APP_ENV=development webpack"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"jest": {
"roots": [
"<rootDir>/src"
],
"collectCoverageFrom": [
"src/**/*.{js,jsx,ts,tsx}",
"!src/**/*.d.ts"
],
"setupFiles": [
"react-app-polyfill/jsdom"
],
"setupFilesAfterEnv": [],
"testMatch": [
"<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}",
"<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}"
],
"testEnvironment": "jest-environment-jsdom-fourteen",
"transform": {
"^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/babel-jest",
"^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
"^(?!.*\\.(js|jsx|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
},
"transformIgnorePatterns": [
"[/\\\\]node_modules[/\\\\].+\\.(js|jsx|ts|tsx)$",
"^.+\\.module\\.(css|sass|scss)$"
],
"modulePaths": [],
"moduleNameMapper": {
"^react-native$": "react-native-web",
"^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy"
},
"moduleFileExtensions": [
"web.js",
"js",
"web.ts",
"ts",
"web.tsx",
"tsx",
"json",
"web.jsx",
"jsx",
"node"
],
"watchPlugins": [
"jest-watch-typeahead/filename",
"jest-watch-typeahead/testname"
]
},
"babel": {
"presets": [
"react-app"
]
},
"devDependencies": {
"dotenv": "^6.2.0",
"react-app-env": "^1.2.3"
},
"proxy": "http://45.86.181.235" // here
}

Answer 1

You can keep environment variables in .env file for different environments
.env file
REACT_APP_CONFIG_URL=http://45.86.181.235
And you can access the value in react like this:
const configUrl = process.env.REACT_APP_CONFIG_URL
And if you want to change by script,
In windows:
"REACT_APP_CONFIG_URL=45.86.181.235" && npm start
In linux or macOs:
REACT_APP_CONFIG_URL=45.86.181.235 npm start
More info:
https://create-react-app.dev/docs/adding-custom-environment-variables/

Answer 2

Try this npm install dotenv --save
Details here: dotenv-how to ues it
In .env file, you can add this:
REACT_APP_API=http://xxxx.xxxx.xxxx.xxxx:8080/api
And in your http service for api you can use it as following
const baseURL = process.env.REACT_APP_API;
Enjoy.