npm start gives an error - node.js

Question

I have installed different packages through npm to run a simple hello world application in React (I am new to it). After their installation, the package.json has this format.
{
"name": "test",
"version": "1.0.0",
"description": "test",
"main": "index.js"
},
"repository": {
"type": "git",
"url": "https://github.com/theo82"
},
"keywords": [
"test"
],
"author": "Theo Tziomakas",
"license": "ISC",
"dependencies": {
"react": "^15.4.2",
"react-dom": "^15.4.2",
"webpack": "^2.2.1"
}
}
After running the npm start in cmd(windows 8.1),I get this error.
npm ERR! Unexpected token ',' at 6:4
npm ERR! },
npm ERR! ^
In various answers people solved this problem by using a clean cache as
npm cache clean
However,this does not work for me:(. Any ideas why is this happening?
Thanks,
Theo.

Answer 1

There are syntax errors in your file. Also you should specify what your start script should do. For example, when you run npm start node should execute the index.js file
{
"name": "test",
"version": "1.0.0",
"description": "test",
"main": "index.js",
"scripts": {
"start": "node index.js"
},
"keywords": [
"test"
],
"author": "",
"license": "ISC"
}

Answer 2

The syntax of your package.json have some problem, there is a extra } after the line of the key main
{
"name": "test",
"version": "1.0.0",
"description": "test",
"main": "index.js",
"repository": {
"type": "git",
"url": "https://github.com/theo82"
},
"keywords": [
"test"
],
"author": "Theo Tziomakas",
"license": "ISC",
"dependencies": {
"react": "^15.4.2",
"react-dom": "^15.4.2",
"webpack": "^2.2.1"
}
}