Скачать или смотреть How to Connect Your Node.js Backend to a React Frontend on EC2 Using Nginx

Learn how to configure your `Node.js` application running on an EC2 instance to communicate effectively with your `React` frontend using Nginx as a reverse proxy.
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How to Connect Your Node.js Backend to a React Frontend on EC2 Using Nginx

Deploying a MERN (MongoDB, Express, React, Node.js) application on an EC2 instance can sometimes present challenges, particularly when it comes to ensuring seamless communication between the backend and frontend. If you're facing issues connecting your Node.js application running on port 8080 with a React client via your EC2 public IPv4 address, don't worry—this guide will help you resolve that.

Understanding the Problem

In your setup, you have:

An EC2 instance running a Node.js application on port 8080.

A React client that needs to communicate with this backend.

An Nginx server configured to manage requests and proxy them to the Node.js application.

The main challenge arises when the frontend makes requests to the API using the wrong URL, leading to errors such as 404 Not Found, 405 Method Not Allowed, or 502 Bad Gateway.

Solution Overview

We’ll need to focus on two major areas to fix the communication issue:

Nginx Configuration: Ensure that Nginx is correctly set up to forward requests to the Node.js server.

API URL Setup: Adjust how the React app communicates with the backend.

Configuring Nginx as a Reverse Proxy

The Nginx server can act as a reverse proxy that forwards requests from the React frontend to the Node.js backend. Here’s how you can configure it effectively:

Open your Nginx configuration file, commonly found in /etc/nginx/sites-available/default or /etc/nginx/nginx.conf.

Add or modify the following server block:

[[See Video to Reveal this Text or Code Snippet]]

Don't forget to replace /path/to/your/react/build with the actual path where your React app is built.

After making changes, restart Nginx:

[[See Video to Reveal this Text or Code Snippet]]

Setting the API URL in React

The second part of the solution concerns the API URL specified in your React code. Instead of pointing to the localhost, you should use the public DNS provided by AWS:

Update your API URL in your React service to:

[[See Video to Reveal this Text or Code Snippet]]

Summary

By correctly setting up your Nginx server to function as a reverse proxy and updating the API URL in your React application, you should be able to establish seamless communication between your Node.js backend and React frontend hosted on AWS EC2.

Make sure to always test your setup after making changes and consult the logs in case you run into further issues. Deployment and configuration can be tricky, but with patience and troubleshooting, you’ll get it up and running smoothly!

If you find yourself confused or have more questions about working with Node.js, React, or Nginx, feel free to reach out for assistance. Everyone has gaps in their knowledge, and tackling these together is part of the learning journey!