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# Intro to GraphQL

<img style="width: 200px; box-shadow: none; border: 0;" id="graphql-logo" src="http://graphql.org/img/logo.svg"/>

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Typical REST API

Note:

usually an arbitrary endpoint, in the wild most APIs are not truly RESTful
no standard way to control output of the endpoint
- do you make another endpoint? special query params?

Problems

GraphQL is a query language for your API and a runtime for fulfilling those queries with your existing data

Note:

graphql itself is just a spec, countless implementations of graphql in many languages (python -> graphene)
- main implementation just happens to be js
- GraphQL was originally created in 2012 at Facebook

type Coupon {
  storeId: ID!
  code: String!
}

type Store {
  id: ID!
  name: String!
  coupons: [Coupon]
}

Note:

{
  store(id: "200") {
    name
    coupons {
      code
    }
  }
}

{
  "store": {
    "name": "Macy's"
    "coupons": [
      {
        code: "10-OFF"
      },
      {
        code: "20-OFF"
      }
    ]
  }
}