That's a realtime chat where you can send message to another user. To test, you can create two users and message yourself.

npm install express cors axios
express - http framework for running node servers
cors - can call this server from anywhere else on the internet
axios - can make API calls to chatengine.io

npm install --save-dev nodemon - nodemon is just optional, but it it helps to run node.js server in development mode

npm create vite@latest - this command helps to set react project(choose React + JavaScript during setting the project)

npm install - it helps to install all of the dependencies because it doesn't do that by default(there is no need to do it if you copied and pasted the project)

I hide my API keys, so you can get them in https://chatengine.io/. You need Project ID and Private key for project. You should sign up in chatengine and find keys in "Project Settings" tab.

Backend Private Key. backend folder -> index.js -> line 15
Instead of process.env.API_KEY, you should paste your Private key.

Frotend Project ID. frotnent folder -> src -> ChatPage.jsx -> line 5
Instead of process.env.API_KEY, you should paste your Porject ID.

cd frontent - you need to run the project in froentend folder

npm run dev - Here we go! Enjoy:D