graphql

Q: How do I install graphql?

Run npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill graphql in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/graphql/ (personal) or .claude/skills/graphql/ (project).

by pluginagentmarketplaceBackend & APIs

Build GraphQL APIs with Node.js using Apollo Server, type definitions, resolvers, and real-time subscriptions

Installs: 40
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill graphql

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads graphql automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

GraphQL with Node.js Skill

Master building flexible, efficient GraphQL APIs using Node.js with Apollo Server, type-safe schemas, and real-time subscriptions.

Quick Start

GraphQL API in 4 steps:

Define Schema - Types, queries, mutations
Write Resolvers - Data fetching logic
Setup Server - Apollo Server configuration
Connect Data - Database integration

Core Concepts

Schema Definition (SDL)

type User {
  id: ID!
  name: String!
  email: String!
  posts: [Post!]!
}

type Post {
  id: ID!
  title: String!
  content: String
  author: User!
}

type Query {
  user(id: ID!): User
  users(limit: Int, offset: Int): [User!]!
  post(id: ID!): Post
}

type Mutation {
  createUser(input: CreateUserInput!): User!
  updateUser(id: ID!, input: UpdateUserInput!): User
  deleteUser(id: ID!): Boolean!
}

input CreateUserInput {
  name: String!
  email: String!
  password: String!
}

type Subscription {
  postCreated: Post!
}

Apollo Server Setup

const { ApolloServer } = require('@apollo/server');
const { expressMiddleware } = require('@apollo/server/express4');
const { readFileSync } = require('fs');

const typeDefs = readFileSync('./schema.graphql', 'utf-8');

const resolvers = {
  Query: {
    user: async (_, { id }, { dataSources }) => {
      return dataSources.userAPI.getUser(id);
    },
    users: async (_, { limit = 10, offset = 0 }, { dataSources }) => {
      return dataSources.userAPI.getUsers(limit, offset);
    }
  },
  Mutation: {
    createUser: async (_, { input }, { dataSources }) => {
      return dataSources.userAPI.createUser(input);
    }
  },
  User: {
    posts: async (parent, _, { dataSources }) => {
      return dataSources.postAPI.getPostsByAuthor(parent.id);
    }
  }
};

const server = new ApolloServer({ typeDefs, resolvers });
await server.start();

app.use('/graphql', express.json(), expressMiddleware(server, {
  context: async ({ req }) => ({
    user: req.user,
    dataSources: {
      userAPI: new UserAPI(),
      postAPI: new PostAPI()
    }
  })
}));

Learning Path

Beginner (2-3 weeks)

✅ Understand GraphQL concepts
✅ Define schemas with SDL
✅ Write basic resolvers
✅ Query and mutation basics

Intermediate (4-6 weeks)

✅ Field resolvers and relationships
✅ Input validation
✅ Error handling
✅ DataLoader for N+1

Advanced (8-10 weeks)

✅ Subscriptions (real-time)
✅ Authentication and authorization
✅ Federation for microservices
✅ Performance optimization

DataLoader for N+1 Problem

const DataLoader = require('dataloader');

const createUserLoader = () =>
  new DataLoader(async (userIds) => {
    const users = await User.find({ _id: { $in: userIds } });
    const userMap = new Map(users.map(u => [u.id, u]));
    return userIds.map(id => userMap.get(id));
  });

// Use in resolver
User: {
  posts: (parent, _, { loaders }) => {
    return loaders.userLoader.load(parent.authorId);
  }
}

Authentication & Authorization

const { shield, rule, allow } = require('graphql-shield');

const isAuthenticated = rule()((parent, args, { user }) => {
  return user !== null;
});

const isAdmin = rule()((parent, args, { user }) => {
  return user?.role === 'admin';
});

const permissions = shield({
  Query: { '*': allow, users: isAuthenticated },
  Mutation: {
    createPost: isAuthenticated,
    deleteUser: isAdmin
  }
});

Error Handling

const { ApolloError, UserInputError } = require('apollo-server-express');

class NotFoundError extends ApolloError {
  constructor(message) {
    super(message, 'NOT_FOUND');
  }
}

// In resolvers
const resolvers = {
  Query: {
    user: async (_, { id }) => {
      const user = await User.findById(id);
      if (!user) throw new NotFoundError(`User ${id} not found`);
      return user;
    }
  }
};

Unit Test Template

const { createTestClient } = require('apollo-server-testing');

describe('GraphQL API', () => {
  let query, mutate;

  beforeAll(() => {
    const server = new ApolloServer({ typeDefs, resolvers });
    const testClient = createTestClient(server);
    query = testClient.query;
    mutate = testClient.mutate;
  });

  it('should return users list', async () => {
    const GET_USERS = `query { users { id name } }`;
    const res = await query({ query: GET_USERS });

    expect(res.errors).toBeUndefined();
    expect(res.data.users).toBeDefined();
  });
});

Troubleshooting

Problem	Cause	Solution
N+1 query issue	Field resolvers	Use DataLoader
Slow queries	No caching	Implement Apollo Cache
Type errors	Schema mismatch	Validate with codegen
Auth bypass	Missing guards	Use graphql-shield

When to Use

Use GraphQL when:

Clients need flexible data fetching
Multiple clients with different data needs
Avoiding over-fetching/under-fetching
Real-time updates needed
API evolution without versioning

Related Skills

Express REST API (alternative approach)
Database Integration (data sources)
JWT Authentication (securing API)

Resources

FAQ

What does the graphql skill do?

Build GraphQL APIs with Node.js using Apollo Server, type definitions, resolvers, and real-time subscriptions

How do I install graphql?

Run npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill graphql in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/graphql/ (personal) or .claude/skills/graphql/ (project).

Which AI agents can use graphql?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is graphql safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains graphql?

It is published by pluginagentmarketplace in pluginagentmarketplace/custom-plugin-nodejs. It has 40 recorded installs.

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graphql

Install

Install

Describe the task

Review the result

SKILL.md

GraphQL with Node.js Skill

Quick Start

Core Concepts

Schema Definition (SDL)

Apollo Server Setup

Learning Path

Beginner (2-3 weeks)

Intermediate (4-6 weeks)

Advanced (8-10 weeks)

DataLoader for N+1 Problem

Authentication & Authorization

Error Handling

Unit Test Template

Troubleshooting

When to Use

Related Skills

Resources

FAQ

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