How to Run an Existing React Project from GitHub

To run a React project from GitHub, you clone the repository, install its dependencies, and start the development server. The commands are almost always the same because the project declares them in its package.json file.

Before you start, make sure Node.js and Git are installed. The guide on setting up Node.js for React covers the Node part.

Clone the repository

Copy the repository URL from the green Code button on GitHub, then run:

bash

git clone https://github.com/username/repo-name.git

Replace username and repo-name with the values from the project page. Git downloads the code into a new folder named after the repository.

Move into that folder:

bash

cd repo-name

From here on, every command runs inside the project. Most repositories document extra steps, such as a specific Node version or environment variables, in a README file. Skim it before installing anything.

Install dependencies

Dependencies are listed in package.json but not shipped with the repository. Install them with:

bash

npm install

If the repository contains a package-lock.json file, run npm ci instead. It installs the exact versions from the lockfile and is faster for a fresh checkout. Either command downloads the packages into a node_modules folder that is rebuilt on each machine.

Start the development server

Check the scripts section of package.json to find the dev command. For most React projects created with Vite it is:

bash

npm run dev

The terminal prints a local URL, usually http://localhost:5173. Open it and the app should appear.

Troubleshooting

• If npm reports that Node is too old, upgrade Node and try again.
• If the project uses npm start instead of npm run dev, use the command listed in package.json.
• If a dependency fails to install, delete node_modules and run npm install again. Keep the lockfile, since it records the versions the project was tested with.
• If the port is busy, the dev server usually suggests another port automatically.
• If the repository includes an .nvmrc file, switch to the Node version it lists before installing.

The guide on common React setup errors walks through the fixes in more detail.

What to learn next

With the app running, learn what each file does in the React project structure guide. Then make your first change by building a counter component. The same install and run flow works for most JavaScript projects, not just React.