Example of a graphql setup (Resolver - handles functions, query requests data, graphql.json is the return, schema.graphql is what you can traverse

graphql.json

{
  "data": {
    "jobs": [
      {
        "id": "rJKAbDd_z",
        "title": "Frontend Developer",
        "company": {
          "id": "HJRa-DOuG",
          "name": "Facegle",
          "description": "We are a startup on a mission to disrupt social search engines. Think Facebook meet Google."
        },
        "description": "We are looking for a Frontend Developer familiar with React."
      },
     ]
  }
}

query.graphql

{
  jobs {
    id
    title
    company {
      id
      name
      description
    }
    description
  }
}

resolver.js

const db = require('./db');

const Query = {
  jobs: () => db.jobs.list()
};

const Job = {
  company: (job) => db.companies.get(job.companyId)
}

module.exports = { Query, Job};

schema.graphql

type Query {
  jobs: [Job]
}

type Company {
  id: ID!
  name: String
  description: String
}

type Job {
  id: ID!
  title: String
  company: Company
  description: String
}