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GihanRangana
GihanRangana

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How to Build Express JS Server with Typescript

#express #node #typescript #beginners

If you're looking for a quick and easy way to get started with Express JS, then this video is for you! We'll walk you through the steps necessary to build an Express JS server with Typescript, and by the end of the video, you'll have a working server ready to go!

Setup

Initialize NPM Project 

npm init -y
npm install --dev typescript ts-node @types/node
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Adding tsconfig.json 

npx tsc --init
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tsconfig.json

{
  "compilerOptions": {
    "module": "NodeNext",
    "moduleResolution": "NodeNext",
    "target": "ES2020",
    "sourceMap": true,
    "outDir": "dist"
  },
  "include": [
    "src/**/*"
  ]
}
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Configure nodemon to restart the server automatically when adding changes to files. 

npm install --dev nodemon
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nodemon.json

{
    "watch": [
        "src/**/*"
    ],
    "exec": "npm run start:dev",
    "ext": "js,ts,json"
}
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Scripts on package.json 

"scripts": {
    "build": "tsc",
    "start:dev": "ts-node src/index.ts",
    "dev": "nodemon",
    "start":"npm run build && node ./dist/index.js"
}
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Install and config Express Js 

npm install express dotenv
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type definitions for express

npm install --dev @types/express
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src/index.ts

import express from 'express';
import dotenv from 'dotenv'

dotenv.config()

const app = express()

app.get('/', (req, res) => {
    res.send("Welcome to TS Server Updated!!!")
})

app.listen(process.env.PORT,() => {
    console.log(`TS Server listening on ${process.env.PORT}`)
})
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.env

PORT=3000
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Finally

npm run dev to run dev mode
npm start to production mode

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