how to include build script in node js

1{
2      "name": "to-do-app",
3      "version": "1.0.0",
4      "description": "A basic to-do app created using JavaScript.",
5      "main": "index.js",
6      "scripts": {
7        "test": "put test command here",  // example "test": "mocha test.js"
8         "build" : "put build command here"
9      },
10      "author": "Sahil Silare",
11      "license": "MIT",
12      "dependencies": {
13        "body-parser": "^1.19.0",
14        "build": "^0.1.4",
15        "ejs": "^2.7.1",
16        "express": "^4.17.1",
17        "npm-build": "0.0.1"
18      },
19      "devDependencies": {},
20      "repository": {
21        "type": "git",
22        "url": "git+https://github.com/sahil9001/to-do-app.git"
23      },
24      "keywords": [
25        "todo",
26        "app"
27      ],
28      "bugs": {
29        "url": "https://github.com/sahil9001/to-do-app/issues"
30      },
31      "homepage": "https://github.com/sahil9001/to-do-app#readme"
32    }
33