Different ways to connect react frontend and node backend

There are different ways to connect react frontend and NodeJS backend. In this blog, I am going to tell you three ways how you can connect backend and frontend. These are the ways most developers prefer.

Prerequisites

React and NodeJS

Let's get started

1. Single server

The first way is having a single server that serves both Node API and React SPA under the same domain. Here data is still exchanged through JSON. As you can see in the above picture, all the routes which do not start with /api will be handled by React SPA.
This is a simple way and you don't need to worry about those CORS errors🥶.
Here's how you can do it-

Copy build folder files from react app and paste them in public folder of NodeJS server.
Now server the static index.html which in the public folder ```java

app.use(express.static(path.join('public')));
app.use((req,res) => {
res.sendFile(path.resolve(__dirname, 'public', 'index.html'));
});


#### Pros
* Single server.
* No more CORS errors 😅
* Ideal for small applications.

#### Cons
* As both frontend and backend will be handled by the same server, you may face performance issues.

### 2. Two separated servers
![Two separated servers](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/j4r735kh5mzslxq4l0yf.jpg)
Here we need two separate servers. One server serve static React SPA and another server serve Node API. Data will be exchanged through JSON.

#### Pros
* As we use two different servers for backend and frontend, we get better performance.
* Ideal for bigger applications.

#### Cons
* Have to maintain two different servers.

### 3. Template engines
The third way and the least preferred way is server-side rendering with template engines like [ejs](https://ejs.co/), [handlebars](https://handlebarsjs.com/), [pugjs](https://pugjs.org/) etc... Here we don't create any REST API.
We render different HTML pages for different HTTP requests and use react to pre-render some parts of the page.
This is not the preferred way to connect React and Node because we don't get the power of reactive user experience. 

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So, what other ways do you know and what is your preferred way? Comment below 👇

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Hope this helps you!
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Blog

Different ways to connect react frontend and node backend

Rakesh Potnuru

Prerequisites

Let's get started

1. Single server

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