POLLS

A real-time voting system where users can create a poll and other users can cast their votes. The system generates a ranking among the options and updates the votes in real-time.

Stacks

• NodeJS
• Docker
• PostgreSQL
• Redis
• Fastify
• Zod
• Prisma
• WebSockets

Setup

• Clone the repository;
• Install dependencies (npm install);
• Setup PostgreSQL and Redis (docker compose up -d);
• Copy .env.example file;
• Run application (npm run dev);
• Test it with Hoppscotch.

API Routes

Create poll: POST /polls

Request body

{
  "title": "Qual a melhor linguagem de programação?",
  "options": [
    "JavaScript",
    "Java",
    "PHP",
    "C#"
  ]
}

Response body

{
  "pollId": "194cef63-2ccf-46a3-aad1-aa94b2bc89b0"
}

Get poll: GET /polls/:pollId

Response body

{
	"poll": {
		"id": "e4365599-0205-4429-9808-ea1f94062a5f",
		"title": "Qual a melhor linguagem de programação?",
		"options": [
			{
				"id": "4af3fca1-91dc-4c2d-b6aa-897ad5042c84",
				"title": "JavaScript",
				"score": 1
			},
			{
				"id": "780b8e25-a40e-4301-ab32-77ebf8c79da8",
				"title": "Java",
				"score": 0
			},
			{
				"id": "539fa272-152b-478f-9f53-8472cddb7491",
				"title": "PHP",
				"score": 0
			},
			{
				"id": "ca1d4af3-347a-4d77-b08b-528b181fe80e",
				"title": "C#",
				"score": 0
			}
		]
	}
}

Vote on poll: POST /polls/:pollId/votes

Request body

{
  "pollOptionId": "31cca9dc-15da-44d4-ad7f-12b86610fe98"
}

Results in real-time: ws /polls/:pollId/results (WebSocket)

Message

{
  "pollOptionId": "da9601cc-0b58-4395-8865-113cbdc42089",
  "votes": 2
}

Código criado juntamente ao evento NLW Expert da Rocketseat.