@karlhorky's Create React App
Create React apps with no build configuration.
- CSS Modules
- PostCSS (with imports, variables, and nesting)
- Style linting with
- Getting Started – How to create a new app.
- User Guide – How to develop apps bootstrapped with Create React App.
npm install -g create-react-app create-react-app my-app --scripts-version @karlhorky/react-scripts cd my-app/ npm start
Then open http://localhost:3000/ to see your app.
When you’re ready to deploy to production, create a minified bundle with
npm run build.
Install it once globally:
npm install -g create-react-app
You’ll need to have Node >= 4 on your machine.
We strongly recommend to use Node >= 6 and npm >= 3 for faster installation speed and better disk usage. You can use nvm to easily switch Node versions between different projects.
This tool doesn’t assume a Node backend. The Node installation is only required for the build tools that rely on it locally, such as Webpack and Babel.
Creating an App
To create a new app, run:
create-react-app my-app cd my-app
It will create a directory called
my-app inside the current folder.
Inside that directory, it will generate the initial project structure and install the transitive dependencies:
my-app/ README.md node_modules/ package.json .gitignore public/ favicon.ico index.html src/ App.css App.js App.test.js index.css index.js logo.svg
No configuration or complicated folder structures, just the files you need to build your app.
Once the installation is done, you can run some commands inside the project folder:
Runs the app in development mode.
Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits.
You will see the build errors and lint warnings in the console.
Runs the test watcher in an interactive mode. By default, runs tests related to files changes since the last commit.
npm run build
Builds the app for production to the
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.
Your app is ready to be deployed!
The User Guide includes information on different topics, such as:
- Updating to New Releases
- Folder Structure
- Available Scripts
- Displaying Lint Output in the Editor
- Installing a Dependency
- Importing a Component
- Adding a Stylesheet
- Post-Processing CSS
- Adding Images and Fonts
- Using the
- Using Global Variables
- Adding Bootstrap
- Adding Flow
- Adding Custom Environment Variables
- Can I Use Decorators?
- Integrating with a Node Backend
- Proxying API Requests in Development
- Using HTTPS in Development
- Generating Dynamic
<meta>Tags on the Server
- Running Tests
- Developing Components in Isolation
- Making a Progressive Web App
A copy of the user guide will be created as
README.md in your project folder.
How to Update to New Versions?
Please refer to the User Guide for this and other information.
One Dependency: There is just one build dependency. It uses Webpack, Babel, ESLint, and other amazing projects, but provides a cohesive curated experience on top of them.
Convention over Configuration: You don't need to configure anything by default. Reasonably good configuration of both development and production builds is handled for you so you can focus on writing code.
No Lock-In: You can “eject” to a custom setup at any time. Run a single command, and all the configuration and build dependencies will be moved directly into your project, so you can pick up right where you left off.
Why Use This?
If you’re getting started with React, use
create-react-app to automate the build of your app. There is no configuration file, and
react-scripts is the only extra build dependency in your
package.json. Your environment will have everything you need to build a modern React app:
- React, JSX, and ES6 support.
- Language extras beyond ES6 like the object spread operator.
- A dev server that lints for common errors.
- Autoprefixed CSS, so you don’t need
-webkitor other prefixes.
buildscript to bundle JS, CSS, and images for production, with sourcemaps.
The feature set is intentionally limited. It doesn’t support advanced features such as server rendering or CSS modules. The tool is also non-configurable because it is hard to provide a cohesive experience and easy updates across a set of tools when the user can tweak anything.
Converting to a Custom Setup
If you’re a power user and you aren’t happy with the default configuration, you can “eject” from the tool and use it as a boilerplate generator.
npm run eject copies all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. Commands like
npm start and
npm run build will still work, but they will point to the copied scripts so you can tweak them. At this point, you’re on your own.
Note: this is a one-way operation. Once you
eject, you can’t go back!
You don’t have to ever use
eject. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
Some features are currently not supported:
- Server rendering.
- Some experimental syntax extensions (e.g. decorators).
- CSS Modules.
- LESS or Sass.
- Hot reloading of components.
Some of them might get added in the future if they are stable, are useful to majority of React apps, don’t conflict with existing tools, and don’t introduce additional configuration.
The tools used by Create React App are subject to change. Currently it is a thin layer on top of many amazing community projects, such as:
- webpack with webpack-dev-server, html-webpack-plugin and style-loader
- Babel with ES6 and extensions used by Facebook (JSX, object spread, class properties)
- and others.
All of them are transitive dependencies of the provided npm package.
We'd love to have your helping hand on
create-react-app! See CONTRIBUTING.md for more information on what we're looking for and how to get started.
We are grateful to the authors of existing related projects for their ideas and collaboration:
If you don’t agree with the choices made in this project, you might want to explore alternatives with different tradeoffs. Some of the more popular and actively maintained ones are:
Notable alternatives also include: