Scala On Cloud: Create Node.js & Express.js with Typescript Project

Here are the steps to create Node.js & Express.js with Typescript Project.

Create a folder.
Type command "npm init" to create package files.
Type "npm install -g typescript" to install typescript.
Type "tsc --init" to create typescript config file.
Type "npm install express --save" to download express module.
Type "npm install nodemon --save-dev" to download nodemon developer tool.
Type "install install @types/node --save-dev" to download typescript node definition files.
Type "install install @types/express --save-dev" to download typescript express definition files.
Edit the package.json
Change to main to "dist/app.js" to point to the start javascript file.
Add the start scripts, "start" : "nodemon dist/app.js"
The package.json will look like below:
Edit the tsconfig.json
Add "moduleResolution" : "node" under "module" : "commonjs".
Change the "outDir" : "./dist". This is the location where typescript compiles the javascript.
Change the "rootDir" : "./srv". This is where we store the typescript files.

The tsconfig.json will look like below:

Create /src folder and add app.ts. Edit the app.ts with the below script.

import express from "express";

const app = express();
const port = process.env.port || 3001;

// Adding middleway to use syntax req.body.name.
app.use(express.json());

app.get("/", (req, res) => res.send("Hello World!"));

app.listen(port, () =>
  console.log(`Example app is listening on post ${port}!`)
);

Open a terminal run "npm start". This will start the web server using nodemon.

Open another terminal run "tsc --watch". This will watch the /src folder to compile the ts to javascript.

Call http://localhost:3001/ using postman. If you see "Hello World!", congratulation, you have completed the setup Node.js & Express.js with the Typescript project.