I tried to run a Node.js application using TypeScript and Express, but it didn’t work. It threw some errors. Can someone help me resolve this issue? [closed]

I am trying to run a Node.js application using TypeScript and Express. However, I am encountering the following issues:

1.When I use the command npm run dev, I get the error: TypeError: Unknown file extension '.ts'
2.When I try ts-node src/app.ts, I also receive: TypeError: Unknown file extension '.ts'
3.When I try ts-node dist/app.js, I get: Error: Cannot find module

What I Have Tried :
I have installed all necessary dependencies as listed in my package.json.
My TypeScript configuration (tsconfig.json) is set up with “module”: “ESNext” and “target”: “ESNext”.
My nodemon.json is configured to watch .ts files and use ts-node.
I ensured that reflect-metadata is imported at the top of my app.ts.
Despite this, the application is not working.

My Package.json File:

{
  "name": "Testing",
  "version": "1.0.0",
  "description": "",
  "main": "src/app.ts",
  "type": "module",
  "scripts": {
    "test": "echo "Error: no test specified" && exit 1",
    "start": "node dist/app.ts",
    "dev": "nodemon",
    "build": "tsc"
  },
  "dependencies": {
    "dotenv": "^16.4.5",
    "express": "^4.19.2",
    "npm": "^11.0.0",
    "reflect-metadata": "^0.1.13",
    "routing-controllers": "^0.10.4",
    "typeorm": "^0.3.20"
  },
  "devDependencies": {
    "@types/express": "^4.17.21",
    "@types/node": "^20.17.10",
    "@types/request": "^2.48.12",
    "nodemon": "^3.1.9",
    "ts-node": "^10.9.2",
    "typescript": "^5.7.2"
  }
}

My tsconfig File:
    "compilerOptions": {
        "module": "ESNext",
        "target": "ESNext",
        "moduleResolution": "node",
        "esModuleInterop": true,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "outDir": "./dist",
        "rootDir": "./src"
    }

My nodemon.json File :

 {
      "watch": ["src"],
      "execMap": {
        "ts": "ts-node"
      },
      "ext": "ts",
      "ignore": ["src/**/*.spec.ts"]
    }

Environment :
Node.js version: 20.12.2
npm version: 6.14.11

How can I resolve the errors I am encountering and run my TypeScript and Express application correctly? Are there any issues with my configuration, or am I missing something critical?