server

.gitignore

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+node_modules

README.md

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+## GraphQL Server Todo
+
+### 🚀 Start Server:
+
+```bash
+npm install
+npm start
+```

package.json

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+{
+  "name": "graphql-server-test",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node src/server.js",
+    "dev": "nodemon src/server.js"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.17.1",
+    "express-graphql": "^0.9.0",
+    "graphql": "^15.0.0",
+    "mongoose": "^5.9.14",
+    "nodemon": "^2.0.4"
+  }
+}

src/graphql/data/index.js

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+const notes = [
+  {
+    id: '1',
+    title: 'Todo 1',
+    createdAt: '2020-09-28T13:44:55',
+    categoryId: '1',
+  },
+  {
+    id: '2',
+    title: 'Todo 2',
+    createdAt: '2020-02-14T17:23:11',
+    categoryId: '3',
+  },
+  {
+    id: '3',
+    title: 'Todo 3',
+    createdAt: '2020-02-14T17:23:11',
+    categoryId: '2',
+  },
+  {
+    id: '4',
+    title: 'Todo 4',
+    createdAt: '2020-02-14T17:23:11',
+    categoryId: '3',
+  },
+  {
+    id: '5',
+    title: 'Todo 5',
+    createdAt: '2020-02-14T17:23:11',
+    categoryId: '3',
+  },
+  {
+    id: '6',
+    title: 'Todo 6',
+    createdAt: '2020-02-14T17:23:11',
+    categoryId: '2',
+  },
+  {
+    id: '7',
+    title: 'Todo 7',
+    createdAt: '2020-02-14T17:23:11',
+    categoryId: '1',
+  },
+  {
+    id: '8',
+    title: 'Todo 8',
+    createdAt: '2020-02-14T17:23:11',
+    categoryId: '3',
+  },
+]
+
+const categories = [
+  { id: '1', title: 'News' },
+  { id: '2', title: 'Work' },
+  { id: '3', title: 'Health' },
+]
+
+module.exports = { notes, categories }

src/graphql/schema.js

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+const { GraphQLSchema } = require('graphql')
+const { Query } = require('./typeDefs/query')
+
+module.exports = new GraphQLSchema({
+  query: Query,
+})

src/graphql/typeDefs/query.js

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+const { GraphQLObjectType, GraphQLID, GraphQLList } = require('graphql')
+const { notes, categories } = require('../data/index')
+const { NoteType, CategoryType } = require('./types/index')
+
+const Query = new GraphQLObjectType({
+  name: 'Query',
+  fields: {
+    note: {
+      type: NoteType,
+      args: { id: { type: GraphQLID } },
+      resolve(parent, args) {
+        return notes.find((note) => note.id === args.id)
+      },
+    },
+    category: {
+      type: CategoryType,
+      args: { id: { type: GraphQLID } },
+      resolve(parent, args) {
+        return categories.find((category) => category.id === args.id)
+      },
+    },
+    notes: {
+      type: new GraphQLList(NoteType),
+      args: { id: { type: GraphQLID } },
+      resolve(parent, args) {
+        return notes
+      },
+    },
+    categories: {
+      type: new GraphQLList(CategoryType),
+      args: { id: { type: GraphQLID } },
+      resolve(parent, args) {
+        return categories
+      },
+    },
+  },
+})
+
+module.exports = {
+  Query,
+}

src/graphql/typeDefs/types/index.js

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+const {
+  GraphQLObjectType,
+  GraphQLID,
+  GraphQLString,
+  GraphQLList,
+} = require('graphql')
+const { categories, notes } = require('../../data/index')
+
+const NoteType = new GraphQLObjectType({
+  name: 'Note',
+  fields: () => ({
+    id: { type: GraphQLID },
+    title: { type: GraphQLString },
+    createdAt: { type: GraphQLString },
+    categoryId: { type: GraphQLID },
+    category: {
+      type: CategoryType,
+      resolve(parent, args) {
+        return categories.find((category) => category.id === parent.categoryId)
+      },
+    },
+  }),
+})
+
+const CategoryType = new GraphQLObjectType({
+  name: 'Category',
+  fields: () => ({
+    id: { type: GraphQLID },
+    title: { type: GraphQLString },
+    notes: {
+      type: new GraphQLList(NoteType),
+      resolve(parent, args) {
+        return notes.filter((note) => note.categoryId === parent.id)
+      },
+    },
+  }),
+})
+
+module.exports = {
+  NoteType,
+  CategoryType,
+}

src/server.js

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+const express = require('express')
+const graphqlHTTP = require('express-graphql')
+const schema = require('./graphql/schema')
+
+const server = express()
+const PORT = 3001
+
+server.use('/graphql', graphqlHTTP({ schema, graphiql: true }))
+
+server.listen(PORT, () => console.log(`🚀 App is running on port ${PORT}`))