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There are many ways to style React with CSS, this tutorial will take a closer look at inline styling, and CSS stylesheet.

Inline Styling

To style an element with the inline style attribute, the value must be a JavaScript object:

In the documentation, it's saying that I need to copy this appcenter-config.json to the assets folder. Where do I find this folder? Create a new file with the new appcenter-config.json with the following content. Don't forget to add this file to the assets folder of your Android app. I cannot find this assets folder in my react native app. Jan 23, 2019 User Folder. In Windows 7 and earlier versions, you had a User folder directory which was used to store and organize your files in folders by content, such as Documents, Audio Files, Pictures. Dec 08, 2019 The output of the above command creates a new build folder inside the project which contains production build. So far we have created a React app & create a production build of that app. Now next step is to deploy it on IIS. Press Windows + R key and write inetmgr to open the IIS Manager. You can see the below screen.

Example:

• Next.js can serve static files, like images, under a folder called public in the root directory. Files inside public can then be referenced by your code starting from the base URL (/). For example, if you add an image to public/me.png, the following code will access the image.
• You can learn how to create a file dropzone component with react in this article. Just as described in the article, our dropzone will be placed inside a directory called 'dropzone' under the src-directory. So if you created your dropzone component following that article, you can just copy and paste that folder into this project.

Insert an object with the styling information:

Note: In JSX, JavaScript expressions are written inside curly braces, and since JavaScript objects also use curly braces, the styling in the example above is written inside two sets of curly braces {{}}.

camelCased Property Names

Since the inline CSS is written in a JavaScript object, properties with two names, like background-color, must be written with camel case syntax:

Example:

Use backgroundColor instead of background-color:

JavaScript Object

You can also create an object with styling information, and refer to it in the style attribute:

Example:

Create a style object named mystyle:

CSS Stylesheet

You can write your CSS styling in a separate file, just save the file with the .css file extension, and import it in your application.

App.css:

Create a new file called 'App.css' and insert some CSS code in it:

Note: You can call the file whatever you like, just remember the correct file extension.

Import the stylesheet in your application:

CSS Modules

Another way of adding styles to your application is to use CSS Modules.

CSS Modules are convenient for components that are placed in separate files.

The CSS inside a module is available only for the component that imported it, and you do not have to worry about name conflicts.

Create the CSS module with the .module.css extension, example: mystyle.module.css.

mystyle.module.css:

Create a new file called 'mystyle.module.css' and insert some CSS code in it:

Import the stylesheet in your component:

Import the component in your application:

This is a very common question among newer React developers, and one question I had when I was starting out with React and Node.js. In this short example I will show you how to make create-react-app work with Node.js and Express Back-end.

create-react-app

Create a project using create-react-app.

Create a /client directory under example-create-react-app-express directory and move all the React boilerplate code created by create-react-app to this new client directory.

The Node Express Server

Create a package.json file inside the root directory (example-create-react-app-express) and copy the following contents:

Notice I am using concurrently to run the React app and Server at the same time. The –kill-others-on-fail flag will kill other processes if one exits with a non zero status code.

Install nodemon globally and the server dependencies:

Create a server.js file and copy the following contents:

This is a simple Express server that will run on port 5000 and have two API routes: GET - /api/hello, and POST -/api/world.

At this point you can run the Express server with the following command (still inside the root directory):

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Now navigate to http://localhost:5000/api/hello, and you will get the following:

We will test the POST route once we build the React app.

The React App

Now switch over to the client directory where our React app lives.

Add the following line to the package.json file created by create-react-app.

The key to using an Express back-end server with a project created with create-react-app is to use a proxy. This tells the Web-pack development server to proxy our API requests to our API server, given that our Express server is running on localhost:5000.

Now modify ./client/src/App.js to call our Express API Back-end, changes are in bold.

We create callApi method to interact with our GET Express API route, then we call this method in componentDidMount and finally set the state to the API response, which will be Hello From Express.

Notice we didn’t use a fully qualified URL http://localhost:5000/api/hello to call our API, even though our React app runs on a different port (3000). This is because of the proxyline we added to the package.json file earlier.

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We have a form with a single input. When submitted calls handleSubmit, which in turn calls our POST Express API route then saves the response to state and displays a message to the user: I received your POST request. This is what you sent me: [message from input].

Now open ./client/src/App.css and modify .App-header class as follows (changes in bold)

Running the App

If you still have the server running, go ahead and stop it by pressing Ctrl+C in your terminal.

From the project root directory run the following:

This will launch the React app and run the server at the same time.

Now navigate to http://localhost:3000 and you will hit the React app displaying the message coming from our GET Express route. Nice ?!

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Now, type something in the input field and submit the form, you will see the response from the POST Express route displayed right below the input field.

Finally take a look at at your terminal, you will see the message we sent from the client, that is because we call console.log on the request body in the POST Express route.

Production Deployment to Heroku

Open server.js and replace with the following contents:

Open ./package.json and add the following to the scripts entry

Heroku will run the start script by default and this will serve our app. Then we want to instruct Heroku to build our client app, we do so with heroku-postbuild script.

Now, head over to Heroku and log in (or open an account if you don’t have one).

Create a new app and give it a name

Click on the Deploy tab and follow the deploy instructions (which I think they are pretty self-explanatory, no point on replicating them here ?)

And that is it, you can open your app by clicking on the Open app button at the top right corner within the Heroku dashboard for your app.

Visit the deployed app for this tutorial: https://cra-express.herokuapp.com/

Other Deployment Options

I write about other deployments options here:

• Heoku (more in-depth explanation)

Project Structure

This will be the final project structure.

Get the full code on the GitHub repository.

Thank you for reading and I hope you enjoyed it. Any question, suggestions let me know in the comments below!

You can follow me on Twitter, GitHub, Medium, LinkedIn or all of them.

This post was originally posted on my personal blog website.

Update 8/25/19: I have been building a prayer web app called 'My Quiet Time - A Prayer Journal'. If you would like to stay in the loop please sign up through the following link: http://b.link/mqt

The app will be released before the end of the year, I have big plans for this app. To see some mockup screenshots follow the following link: http://pc.cd/Lpy7

My DMs on Twitter are open if you have any questions regarding the app ?