On my pc: E:\ReactJs\reactapp2>SET PORT=3100. This is probably not a problem with npm. However, with the other three, upon using "npm start… I have tried this using node 11.4 and 10.4 (npm 6.4.1) npm install create-react-app -g create-react-app t2 cd t2 npm start Expected. How the react-scripts start process works. Let's start by looking at the start.js script. A complete log of this run can be found in: npm ERR! "scripts": { "start": "PORT=2000 react-scripts start", "build": "react-scripts build", "test": "react-scripts test --env=jsdom", "eject": "react-scripts eject" } Now if you run npm start, the app will start on port 2000. http://localhost:2000 Setting via .env then run the command npm start. But, exists one more problem. Introduction . Créer notre premier squelette d’application. In this tutorial, we are going to learn about how to change the default port number in a create-react-app. To change the port number, first we need to install a new package called cross-env which helps to set environment variables across all platforms (like windows, mac, linux, etc). One of the projects is working completely fine. With the start argument, NPM will begin the process to make a development server available for your React application. This is not the case for running in production. errno 1 npm ERR! Failed at the my-app@0.1.0 start script. I suggest doing these three steps: npm install -g npm@latest to update npm because it is sometimes buggy. rm -rf node_modules to remove the existing modules. Description. Exit status 1 npm ERR! When you run your application with the npm start command, you'll notice that no browser windows are opened.. Voilà ! When you are developing a React application, running the application on your loc a l machine is an easy task, just npm run start and you are all set. Si vous l'exécutez … Apr 10, 2019; 11; Min read28,636; View. It has the start key and its value needs to be prepended with PORT=N, where N is the assigned port number. Now, open your package.json file and add the following line inside the scripts object by specifying your port number. If you will look at package.json file.. you will see something like this "start": "http-server -a localhost -p 8000" This tells start a http-server at address of localhost on port 8000. http-server is a node-module.. Update:-Including comment by @Usman, ideally it should be present in your package.json but if it’s not present you can … Create an .env file in the root directory of your project, i.e., in the same directory where the files .gitignore, package.json and README.md are located. I started by creating a new react app. Port number can also be set as an environment variable. The "scripts" property of of your package.json file supports a number of built-in scripts and their preset life cycle events as well as arbitrary scripts. npm ERR! My project is based on create-react-app. An environment variable is defined on process.env. (C:\Users\Gebruiker\AppData\Roaming\npm\node_modules\npm\node_modules\npm … The React app runs on the port 3000 with the help of a create-react-app. If you need the app to run on some port, assign an environment variable named PORT to the desired port number. Share. Remember that by setting an … How to NPM Start for React Tutorial Project. The first part of this concerns starting react on a different port. An Express.js app also runs on the same port 3000. Description. You may want to do this because you want to run the application on a single… If your app is created via npx create-react-app, you will find the scripts property in your package.json file. Have a question about this project? Default is port 3000, but Apache work on port 80, and in configuration for Apache server must set Proximity how you can show React app. Created reactproject at /opt/reactproject Inside that directory, you can run several commands: npm start Starts the development server. "start": "cross-env PORT=4006 react-scripts start", Here I set a PORT environment variable to 4006 using cross-env, so that my react app runs on port 4006. To be able to start simple react server to hit in browser at localhost:3000. Introduction ; Installing create-react-app ; Create a New React App; What Does package.json Look Like? 63. s. Apr 10, 2019; 11 Min read; 28,636; View. E:\ReactJs\reactapp2>npm start. Copy link Quote reply MagnesiaReal commented Jan 8, 2021. The project got created but when i changed the directory went into the my-app folder and used npm start it gave me these to addresses to open in the browser to view my react app. … SET PORT=3100. The intention being that I would have a reference repository on GitHub. spawn ENOENT It just means something went wrong when dependencies were installed the first time. Compiled successfully! This comment has been minimized. npm start by default will run the application on port 3000 and there is no option of specifying a port in the package.json. If you don’t experience the problems described above or don’t feel comfortable using JavaScript tools yet, consider adding React as a plain