Introduction

This repository showcases the creation of a GraphQL server using Fastify, Mercurius, and GraphQL. The project evolves through different versions, each offering more features and complex responses.

The project consists of three versions of a GraphQL server:

• server_v0.js: Returns a hardcoded name and message.
• server_v1.js: Expands functionality to request name and message.
• server.js: Returns properties with attributes such as description and address.

Requirements

Ensure you have the following libraries installed:

• Fastify
• Mercurius
• GraphQL

Clone and Setup

Clone the repository:

This is how to get the project from Github

git clone https://github.com/tomsouza4/graphql-from-scratch.git

Or you can create your own: Navigate to the desired folder:

cd ~/Documents

Create and enter the folder:

mkdir graphql-from-scratch
cd graphql-from-scratch

Initialize the project:

npm init --yes

Install required libs for this project

npm install fastify mercurius graphql

Open the project with Visual Code(May require to add this PATH, on Visual Code run: Shell Command: Install 'code' command in PATH)

code .

Output Sample

server_v0.js

data	
     sayHello	
         name	"Akshay"
         message	"Akshay> Learning GraphQL"

server_v1.js

{
    "data": {
      "sayHello": {
        "name": "Luis F.",
        "message": "Luis F.> I like GraphQL"
      }
    }
  }

server.js

• 1. Sample result from code:

{
    "data": {
      "availableProperties": [
        {
          "description": "A big house",
          "address": {
            "street": "123 Elm St",
            "city": "Miami",
            "state": "FL",
            "zipCode": 33137
          }
        }
      ]
    }
  }

• 2. After updating const resolvers to filter by city

{
    "data": {
      "availableProperties": [
        {
          "description": "A big pink house with yellow people",
          "address": {
            "street": "321 Evergreen Lane",
            "city": "Springfield",
            "state": "MO",
            "zipCode": 44212
          }
        }
      ]
    }
  }

Resources Used

• Introducing the Salesforce GraphQL API
• Exploring the Salesforce GraphQL API – Part Two
• codeLive: How to Implement a GraphQL API from Scratch