graphql-operation-to-pojo

graphql-operation-to-pojo

Converts GraphQL operations to plain old JS objects (POJOs), ready to to be serialized to JSON.

This can be used to parse the info argument (GraphQLResolveInfo) passed to GraphQL resolvers.

Usage

myResolver(obj, args, context, info) {
    const queryPOJO = graphqlOperationToPOJO(info)
    ...
}

There is also a helper function to serialize the result to a JSON string:

const jsonString = graphqlOperationToJSON(info)

(This is equivalent to calling JSON.stringify(graphqlOperationToPOJO(info)))

Examples

Given the query:

query {
    hero(episode: NEWHOPE) {
        name
        friends {
            name
            appearsIn
        }
    }
}

graphqlOperationToPOJO will return:

{
    "operation": "query",
    "fields": [
        {
            "name": "hero",
            "fields": [
                {
                    "name": "name"
                },
                {
                    "name": "friends",
                    "fields": [
                        {
                            "name": "name"
                        },
                        {
                            "name": "appearsIn"
                        }
                    ]
                }
            ],
            "arguments": {
                "episode": "NEWHOPE"
            }
        }
    ]
}

Aliases

If the query contains aliases, the field object will include an alias property, e.g.:

{
    hero(episode: NEWHOPE) {
        heroName: name
    }
}

{
    "operation": "query",
    "fields": [
        {
            "name": "hero",
            "fields": [
                {
                    "name": "name",
                    "alias": "heroName"
                }
            ],
            "arguments": {
                "episode": "NEWHOPE"
            }
        }
    ]
}

Fragments

Type conditions for fragments are stored in a fragmentType property, e.g.:

{
    character(id: "1000") {
        ... on Human {
            id
            name
            friends {
                id
            }
        }
        ... on Droid {
            name
            friends {
                name
            }
        }
    }
}

{
    "operation": "query",
    "fields": [
        {
            "name": "character",
            "fields": [
                {
                    "name": "id",
                    "fragmentType": "Human"
                },
                {
                    "name": "name",
                    "fragmentType": "Human"
                },
                {
                    "name": "friends",
                    "fragmentType": "Human",
                    "fields": [
                        {
                            "name": "id"
                        }
                    ]
                },
                {
                    "name": "name",
                    "fragmentType": "Droid"
                },
                {
                    "name": "friends",
                    "fragmentType": "Droid",
                    "fields": [
                        {
                            "name": "name"
                        }
                    ]
                }
            ],
            "arguments": {
                "id": "1000"
            }
        }
    ]
}