get-graphql-schema#

The GraphQL schema language is a concise way to represent the available schema provided by a GraphQL endpoint. It looks something like this:

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type assets {
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  url: String
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  node_id: String
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  name: String
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  label: String
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  content_type: String
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  state: String
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  created_at: String
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  updated_at: String
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  browser_download_url: String
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  id: Int
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  size: Int
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  download_count: Int
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  uploader: users
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  release: releases
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}
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type assetsCollection {
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  totalCount: Int
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  pageInfo: PageInfo
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  nodes: [assets]
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  edges: [assetsEdge]
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}

You can retrieve a JSON version of this from the GraphQL server itself using the query at the bottom of this document.

But… if you want it back in readable text as shown above, you can use the get-graphql-schema tool. Run that like this:

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npx get-graphql-schema https://github-to-sqlite.dogsheep.net/graphql

If the API requires authentication, use the --header option like this:

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npx get-graphql-schema https://api.github.com/graphql -h 'Authorization=Bearer XXX'

Retrieving the schema as JSON using GraphQL#

I found this query using the network inspector against a GraphiQL instance (https://api.fly.io/graphql) that offered a “Schema” tab:

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query IntrospectionQuery {
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  __schema {
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    queryType {
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      name
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    }
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    mutationType {
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      name
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    }
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    subscriptionType {
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      name
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    }
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    types {
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      ...FullType
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    }
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    directives {
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      name
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      description
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      locations
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      args {
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        ...InputValue
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      }
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    }
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  }
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}
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fragment FullType on __Type {
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  kind
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  name
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  description
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  fields(includeDeprecated: true) {
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    name
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    description
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    args {
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      ...InputValue
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    }
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    type {
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      ...TypeRef
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    }
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    isDeprecated
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    deprecationReason
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  }
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  inputFields {
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    ...InputValue
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  }
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  interfaces {
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    ...TypeRef
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  }
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  enumValues(includeDeprecated: true) {
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    name
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    description
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    isDeprecated
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    deprecationReason
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  }
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  possibleTypes {
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    ...TypeRef
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  }
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}
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fragment InputValue on __InputValue {
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  name
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  description
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  type {
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    ...TypeRef
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  }
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  defaultValue
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}
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fragment TypeRef on __Type {
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  kind
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  name
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  ofType {
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    kind
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    name
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    ofType {
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      kind
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      name
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      ofType {
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        kind
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        name
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        ofType {
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          kind
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          name
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          ofType {
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            kind
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            name
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            ofType {
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              kind
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              name
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              ofType {
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                kind
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                name
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              }
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            }
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          }
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        }
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      }
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    }
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  }
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}