Multiple commands in package.json

If I understood you correctly, you want firstly run webpack and after compile run nodejs. Maybe try this:

"start": "webpack && node server/server.js"

The following should work:

"start": "webpack && node server/server.js"

Though, for readability (and especially if you plan on adding additional tasks in the future), you may want to consider creating separate entries for each task and then calling each of those from start. So, something like:

{
    "init-assets": "webpack",
    "init-server": "node server/server.js",
    "start": "npm run init-assets && npm run init-server"
}

You can also chain like this:

 "scripts": {
    "clean": "npm cache clean --force",
    "clean:complete": "npm run clean && npm uninstall -g @angular/cli && rmdir /Q /S node_modules",
    "clean:complete:install": "npm run clean:complete && npm i -g @angular/cli && npm i && npm install --save-dev @angular/cli@latest"
}