docker pull dgraph/standalone
mkdir -p ~/dgraph
docker run -it -p 5080:5080 -p 6080:6080 -p 8080:8080 \
  -p 9080:9080 -p 8000:8000 -v ~/dgraph:/dgraph --name dgraph \
  dgraph/standalone:master

touch schema.graphql
nano schema.graphql

type Product {
  id: ID!
  name: String! @id
  reviews: [Review] @hasInverse(field: about)
}
 
type Customer {
  username: String! @id
  reviews: [Review] @hasInverse(field: by)
}
 
type Review {
  id: ID!
  about: Product!
  by: Customer!
  comment: String @search(by: [fulltext])
  rating: Int @search
}

curl -X POST localhost:8080/admin/schema --data-binary '@schema.graphql'

mutation {
  addProduct(input: [{ name: "Dgraph" }, { name: "Dgraph Cloud" }]) {
    product {
      id
      name
    }
  }
  addCustomer(input: [{ username: "TonyStark" }]) {
    customer {
      username
    }
  }
}

mutation {
  addReview(
    input: [
      {
        by: { username: "TonyStark" }
        about: { name: "Dgraph" }
        comment: "Fantastic, easy to install, worked great. Best GraphQL server available"
        rating: 10
      }
    ]
  ) {
    review {
      id
      comment
      rating
      by {
        username
      }
      about {
        id
        name
      }
    }
  }
}

query {
  queryReview(
    filter: { comment: { alloftext: "server easy install" }, rating: { gt: 5 } }
  ) {
    comment
    by {
      username
      reviews(order: { desc: rating }, first: 10) {
        about {
          name
          reviews(order: { asc: rating }, first: 5) {
            by {
              username
            }
            comment
            rating
          }
        }
        rating
      }
    }
    about {
      name
    }
  }
}

npm install graphql

var { graphql, buildSchema } = require("graphql")
 
var schema = buildSchema(`
  type Query {
    hello: String
  }
`)
 
var rootValue = { hello: () => "Hello world!" }
 
var source = "{ hello }"
 
graphql({ schema, source, rootValue }).then(response => {
  console.log(response)
})

npm install @apollo/server graphql

import { ApolloServer } from "@apollo/server"
import { startStandaloneServer } from "@apollo/server/standalone"
 
// The GraphQL schema
const typeDefs = `#graphql
  type Query {
    hello: String
  }
`
 
// A map of functions which return data for the schema.
const resolvers = {
  Query: {
    hello: () => "world",
  },
}
 
const server = new ApolloServer({
  typeDefs,
  resolvers,
})
 
const { url } = await startStandaloneServer(server)
console.log(`🚀 Server ready at ${url}`)

<?php
 
namespace AppEntity;
 
use ApiPlatformCoreAnnotationApiResource;
use DoctrineORMMapping as ORM;
 
/**
 * Greet someone!
 *
 * @ApiResource
 * @ORMEntity
 */
class Greeting
{
    /**
     * @ORMId
     * @ORMColumn(type="guid")
     */
    public $id;
 
    /**
     * @var string Your nice message
     *
     * @ORMColumn
     */
    public $hello;
}

npm install graphql-yoga graphql

import { createServer } from "http"
import { createSchema, createYoga } from "graphql-yoga"
 
createServer(
  createYoga({
    schema: createSchema({
      typeDefs: /* GraphQL */ `
        type Query {
          hello: String
        }
      `,
      resolvers: {
        Query: {
          hello: () => "Hello Hello Hello",
        },
      },
    }),
  }),
).listen(4000, () => {
  console.info("GraphQL Yoga is listening on http://localhost:4000/graphql")
})

pip install graphene

import graphene
 
class Query(graphene.ObjectType):
  hello = graphene.String(name=graphene.String(default_value="World"))
 
  def resolve_hello(self, info, name):
    return 'Hello ' + name
 
schema = graphene.Schema(query=Query)
result = schema.execute('{ hello }')
print(result.data['hello']) # "Hello World"

import graphql.ExecutionResult;
import graphql.GraphQL;
import graphql.schema.GraphQLSchema;
import graphql.schema.StaticDataFetcher;
import graphql.schema.idl.RuntimeWiring;
import graphql.schema.idl.SchemaGenerator;
import graphql.schema.idl.SchemaParser;
import graphql.schema.idl.TypeDefinitionRegistry;
 
import static graphql.schema.idl.RuntimeWiring.newRuntimeWiring;
 
public class HelloWorld {
 
    public static void main(String[] args) {
        String schema = "type Query{hello: String}";
 
        SchemaParser schemaParser = new SchemaParser();
        TypeDefinitionRegistry typeDefinitionRegistry = schemaParser.parse(schema);
 
        RuntimeWiring runtimeWiring = newRuntimeWiring()
                .type("Query", builder -> builder.dataFetcher("hello", new StaticDataFetcher("world")))
                .build();
 
        SchemaGenerator schemaGenerator = new SchemaGenerator();
        GraphQLSchema graphQLSchema = schemaGenerator.makeExecutableSchema(typeDefinitionRegistry, runtimeWiring);
 
        GraphQL build = GraphQL.newGraphQL(graphQLSchema).build();
        ExecutionResult executionResult = build.execute("{hello}");
 
        System.out.println(executionResult.getData().toString());
        // Prints: {hello=world}
    }
}

using System;
using System.Threading.Tasks;
using GraphQL;
using GraphQL.Types;
using GraphQL.SystemTextJson; // First add PackageReference to GraphQL.SystemTextJson
 
public class Program
{
  public static async Task Main(string[] args)
  {
    var schema = Schema.For(@"
      type Query {
        hello: String
      }
    ");
 
    var json = await schema.ExecuteAsync(_ =>
    {
      _.Query = "{ hello }";
      _.Root = new { Hello = "Hello World!" };
    });
 
    Console.WriteLine(json);
  }
}

client.GetHero
    .Watch(ExecutionStrategy.CacheFirst)
    .Subscribe(result =>
    {
        Console.WriteLine(result.Data.Name);
    })

using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
 
WebHost
    .CreateDefaultBuilder(args)
    .ConfigureServices(services =>
        services
            .AddGraphQLServer()
            .AddQueryType<Query>())
    .Configure(builder =>
        builder
            .UseRouting()
            .UseEndpoints(e => e.MapGraphQL()))
    .Build()
    .Run();
 
public class Query
{
    public Hero GetHero() => new Hero();
}
 
public class Hero
{
    public string Name => "Luke Skywalker";
}

gem install graphql

require 'graphql'
 
class QueryType < GraphQL::Schema::Object
  field :hello, String
 
  def hello
    "Hello world!"
  end
end
 
class Schema < GraphQL::Schema
  query QueryType
end
 
puts Schema.execute('{ hello }').to_json

pip install strawberry-graphql

import strawberry
 
@strawberry.type
class Query:
    @strawberry.field
    def hello(self, name: str = "World") -> str:
        return f"Hello {name}"
 
schema = strawberry.Schema(query=Query)

 use async_graphql::*;
 struct Query;
 #[Object]
 impl Query {
    /// Returns the sum of a and b
    async fn add(&self, a: i32, b: i32) -> i32 {
        a + b
    }
 }

import { rule, shield, and, or, not } from "graphql-shield"
 
// Rules
 
const isAuthenticated = rule({ cache: "contextual" })(async (
  parent,
  args,
  ctx,
  info,
) => {
  return ctx.user !== null
})
 
const isAdmin = rule({ cache: "contextual" })(async (
  parent,
  args,
  ctx,
  info,
) => {
  return ctx.user.role === "admin"
})
 
const isEditor = rule({ cache: "contextual" })(async (
  parent,
  args,
  ctx,
  info,
) => {
  return ctx.user.role === "editor"
})
 
// Permissions
 
const permissions = shield({
  Query: {
    frontPage: not(isAuthenticated),
    fruits: and(isAuthenticated, or(isAdmin, isEditor)),
    customers: and(isAuthenticated, isAdmin),
  },
  Mutation: {
    addFruitToBasket: isAuthenticated,
  },
  Fruit: isAuthenticated,
  Customer: isAdmin,
})
 
// Server
 
const server = new GraphQLServer({
  typeDefs,
  resolvers,
  middlewares: [permissions],
  context: req => ({
    ...req,
    user: getUser(req),
  }),
})

docker run schemathesis/schemathesis \
  run https://your.app.com/graphql

{
  "errors": [
    {
      "message": "Cannot read property 'city' of undefined",
      "locations": [
        {
          "line": 1,
          "column": 28
        }
      ],
      "path": ["search", "stations"]
    }
  ],
  "data": null
}

import { ApolloServer } from "apollo-server"
import SchemaBuilder from "@giraphql/core"
 
const builder = new SchemaBuilder({})
 
builder.queryType({
  fields: t => ({
    hello: t.string({
      args: {
        name: t.arg.string({}),
      },
      resolve: (parent, { name }) => `hello, ${name || "World"}`,
    }),
  }),
})
 
new ApolloServer({
  schema: builder.toSchema({}),
}).listen(3000)

npm install fastify mercurius

const Fastify = require("fastify")
const mercurius = require("mercurius")
 
const schema = `
  type Query {
    hello(name: String): String!
  }
`
 
const resolvers = {
  Query: {
    hello: async (_, { name }) => `hello ${name || "world"}`,
  },
}
 
const app = Fastify()
app.register(mercurius, {
  schema,
  resolvers,
})
 
app.listen(3000)
 
// Call IT!
// curl 'http://localhost:3000/graphql' \
//  -H 'content-type: application/json' \
//  --data-raw '{"query":"{ hello(name:\"Marcurius\") }" }'

$ pip install ariadne

from ariadne import ObjectType, gql, make_executable_schema
from ariadne.asgi import GraphQL
 
type_defs = gql(
    """
    type Query {
        hello: String!
    }
    """
)
 
query_type = ObjectType("Query")
 
@query_type.field("hello")
def resolve_hello(*_):
    return "Hello world!"
 
schema = make_executable_schema(type_defs, query_type)
 
app = GraphQL(schema, debug=True)

$ pip install uvicorn
$ uvicorn example:app

import sangria.schema._
import sangria.execution._
import sangria.macros._
 
val QueryType = ObjectType("Query", fields[Unit, Unit](
  Field("hello", StringType, resolve = _ ⇒ "Hello world!")
))
 
val schema = Schema(QueryType)
 
val query = graphql"{ hello }"
 
Executor.execute(schema, query) map println

npm install graphql-hooks

import { GraphQLClient, ClientContext } from "graphql-hooks"
 
const client = new GraphQLClient({
  url: "/graphql",
})
 
function App() {
  return (
    <ClientContext.Provider value={client}>
      {/* children */}
    </ClientContext.Provider>
  )
}

import { useQuery } from "graphql-hooks"
 
const HOMEPAGE_QUERY = `query HomePage($limit: Int) {
  users(limit: $limit) {
    id
    name
  }
}`
 
function MyComponent() {
  const { loading, error, data } = useQuery(HOMEPAGE_QUERY, {
    variables: {
      limit: 10,
    },
  })
 
  if (loading) return "Loading..."
  if (error) return "Something Bad Happened"
 
  return (
    <ul>
      {data.users.map(({ id, name }) => (
        <li key={id}>{name}</li>
      ))}
    </ul>
  )
}

// build.gradle.kts
import com.expediagroup.graphql.plugin.gradle.graphql
 
plugins {
    id("com.expediagroup.graphql") version $latestGraphQLKotlinVersion
}
 
dependencies {
  implementation("com.expediagroup:graphql-kotlin-spring-client:$latestGraphQLKotlinVersion")
}
 
graphql {
    client {
        // target GraphQL endpoint
        endpoint = "http://localhost:8080/graphql"
        // package for generated client code
        packageName = "com.example.generated"
    }
}

query HelloWorldQuery {
  helloWorld
}

package com.example.generated
 
import com.expediagroup.graphql.client.types.GraphQLClientRequest
import kotlin.String
import kotlin.reflect.KClass
 
const val HELLO_WORLD_QUERY: String = "query HelloWorldQuery {\n    helloWorld\n}"
 
class HelloWorldQuery: GraphQLClientRequest<HelloWorldQuery.Result> {
    override val query: String = HELLO_WORLD_QUERY
 
    override val operationName: String = "HelloWorldQuery"
 
    override fun responseType(): KClass<HelloWorldQuery.Result> = HelloWorldQuery.Result::class
 
    data class Result(
        val helloWorld: String
    }
}

package com.example.client
 
import com.expediagroup.graphql.client.spring.GraphQLWebClient
import com.expediagroup.graphql.generated.HelloWorldQuery
import kotlinx.coroutines.runBlocking
 
fun main() {
    val client = GraphQLWebClient(url = "http://localhost:8080/graphql")
    runBlocking {
        val helloWorldQuery = HelloWorldQuery()
        val result = client.execute(helloWorldQuery)
        println("hello world query result: ${result.data?.helloWorld}")
    }
}

// build.gradle.kts
implementation("com.expediagroup", "graphql-kotlin-spring-server", latestVersion)

graphql:
  packages:
    - "com.your.package"

@Component
class HelloWorldQuery : Query {
  fun helloWorld() = "Hello World!!!"
}

type Query {
  helloWorld: String!
}

@Controller
public class GreetingController {
 
    @QueryMapping
    public String hello() {
        return "Hello, world!";
    }
 
}

npm install --dev spectaql
# OR
yarn add -D spectaql
 
# Then generate your docs
npm run spectaql my-config.yml
# OR
yarn spectaql my-config.yml

const { ApolloServer } = require("apollo-server")
const { makeExecutableSchema } = require("@graphql-tools/schema")
 
const typeDefs = `
type Query {
  hello(name: String): String
  bye(name: String): String
}
`
const resolvers = {
  Query: {
    hello: (root, args, context, info) => {
      console.log(`3. resolver: hello`)
      return `Hello ${args.name ? args.name : "world"}!`
    },
    bye: (root, args, context, info) => {
      console.log(`3. resolver: bye`)
      return `Bye ${args.name ? args.name : "world"}!`
    },
  },
}
 
const logInput = async (resolve, root, args, context, info) => {
  console.log(`1. logInput: ${JSON.stringify(args)}`)
  const result = await resolve(root, args, context, info)
  console.log(`5. logInput`)
  return result
}
 
const logResult = async (resolve, root, args, context, info) => {
  console.log(`2. logResult`)
  const result = await resolve(root, args, context, info)
  console.log(`4. logResult: ${JSON.stringify(result)}`)
  return result
}
 
const schema = makeExecutableSchema({ typeDefs, resolvers })
 
const schemaWithMiddleware = applyMiddleware(schema, logInput, logResult)
 
const server = new ApolloServer({
  schema: schemaWithMiddleware,
})
 
await server.listen({ port: 8008 })

type Query {
  hello: String
}

<?php
declare(strict_types=1);
require_once '/path/to/vendor/autoload.php';
 
use SilerDiactoros;
use SilerGraphql;
use SilerHttp;
 
$typeDefs = file_get_contents(__DIR__.'/schema.graphql');
$resolvers = [
    'Query' => [
        'hello' => 'world',
    ],
];
$schema = Graphqlschema($typeDefs, $resolvers);
 
echo "Server running at http://127.0.0.1:8080";
 
Httpserver(Graphqlpsr7($schema), function (Throwable $err) {
    var_dump($err);
    return Diactorosjson([
        'error'   => true,
        'message' => $err->getMessage(),
    ]);
})()->run();

npx create-wundergraph-app my-project -E nextjs-swr

mutation (
  $name: String! @fromClaim(name: NAME)
  $email: String! @fromClaim(name: EMAIL)
  $message: String! @jsonSchema(pattern: "^[a-zA-Z 0-9]+$")
) {
  createOnepost(
    data: {
      message: $message
      user: {
        connectOrCreate: {
          where: { email: $email }
          create: { email: $email, name: $name }
        }
      }
    }
  ) {
    id
    message
    user {
      id
      name
    }
  }
}

query (
  $continent: String!
  # the @internal directive removes the $capital variable from the public API
  # this means, the user can't set it manually
  # this variable is our JOIN key
  $capital: String! @internal
) {
  countries_countries(filter: { continent: { eq: $continent } }) {
    code
    name
    # using the @export directive, we can export the value of the field `capital` into the JOIN key ($capital)
    capital @export(as: "capital")
    # the _join field returns the type Query!
    # it exists on every object type so you can everywhere in your Query documents
    _join {
      # once we're inside the _join field, we can use the $capital variable to join the weather API
      weather_getCityByName(name: $capital) {
        weather {
          temperature {
            max
          }
          summary {
            title
            description
          }
        }
      }
    }
  }
}

# npm
npx @gqty/cli
 
# yarn
yarn dlx @gqty/cli
 
# pnpm
pnpm dlx @gqty/cli

// define your query using Scala
val query: SelectionBuilder[RootQuery, List[CharacterView]] =
  Query.characters {
    (Character.name ~ Character.nicknames ~ Character.origin)
      .mapN(CharacterView)
  }
 
import sttp.client3._
// run the query and get the result already parsed into a case class
val result = query.toRequest(uri"http://someUrl").send(HttpClientSyncBackend()).body

import caliban._
import caliban.schema.Schema.auto._
 
// schema
case class Query(hello: String)
 
// resolver
val resolver = RootResolver(Query("Hello world!"))
 
val api = graphQL(resolver)
 
for {
  interpreter <- api.interpreter
  result      <- interpreter.execute("{ hello }")
} yield result

require 'agoo'
 
class Query
  def hello
    'hello'
  end
end
 
class Schema
  attr_reader :query
 
  def initialize
    @query = Query.new()
  end
end
 
Agoo::Server.init(6464, 'root', thread_count: 1, graphql: '/graphql')
Agoo::Server.start()
Agoo::GraphQL.schema(Schema.new) {
  Agoo::GraphQL.load(%^type Query { hello: String }^)
}
sleep
 
# To run this GraphQL example type the following then go to a browser and enter
# a URL of localhost:6464/graphql?query={hello}
#
# ruby hello.rb

pip install tartiflette

import asyncio
from tartiflette import Engine, Resolver
@Resolver("Query.hello")
async def resolver_hello(parent, args, ctx, info):
    return "hello " + args["name"]
async def run():
    tftt_engine = Engine("""
    type Query {
        hello(name: String): String
    }
    """)
    result = await tftt_engine.execute(
        query='query { hello(name: "Chuck") }'
    )
    print(result)
    # {'data': {'hello': 'hello Chuck'}}
if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(run())

import SwiftGraphQL
 
// Define a Swift model.
struct Human: Identifiable {
    let id: String
    let name: String
    let homePlanet: String?
}
 
// Create a selection.
let human = Selection.Human {
    Human(
        id: try $0.id(),
        name: try $0.name(),
        homePlanet: try $0.homePlanet()
    )
}
 
// Construct a query.
let query = Selection.Query {
    try $0.humans(human.list)
}
 
// Perform the query.
send(query, to: "http://swift-graphql.heroku.com") { result in
    if let data = try? result.get() {
        print(data) // [Human]
    }
}

class ProductController
{
    /**
     * @Query()
     */
    public function product(string $id): Product
    {
        // Some code that looks for a product and returns it.
    }
}
 
/**
 * @Type()
 */
class Product
{
    /**
     * @Field()
     */
    public function getName(): string
    {
        return $this->name;
    }
    // ...
}

gqt -e https://your.app.com/graphql