The first thing we need to do is to create a directory for our project and initialize a new package.json file installing express, graphql, and express-graphql:

  mkdir contacts-graphql
  cd contacts-graphql
  npm init --yes
  npm install express graphql express-graphql babel-preset-env
  npm install -g babel-cli

We need to install babel-preset-env and babel-cli to use ES6 syntax in Node. Also, we need to create a .babelrc file :

  {
    "presets": ["env"]
  }