It looks like you might not have defined a `start` script in your `package.json` file or your project does not contain a `server.js` file.
> If there is a server.js file in the root of your package, then npm > will default the start command to node server.js.
[https://docs.npmjs.com/misc/scripts#default-values][1]
You could either change the name of your application script to `server.js` or add the following to your `package.json`
"scripts": { "start": "node your-script.js" }
Or ... you could just run `node your-script.js` directly

[1]: https://docs.npmjs.com/cli/v8/using-npm/scripts/

It looks like you might not have defined a `start` script in your `package.json` file or your project does not contain a `server.js` file.
> If there is a server.js file in the root of your package, then npm will default the start command to node server.js.
https://docs.npmjs.com/misc/scripts#default-values
You could either change the name of your application script to `server.js` or add the following to your `package.json`
"scripts": { "start": "node your-script.js" }
Or ... you could just run `node your-script.js` directly