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About

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.

Build with

  • Node JS;
  • Fastify;
  • Docker;
  • Prisma;
  • Websocket;
  • Redis;
  • PostgreSQL;
  • Zod;

Requisites

  • Docker;
  • Node JS;

Setup

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

HTTP

POST /polls

Create a new poll.

Request body

{
  "title": "What is your favorite programming language?",
  "options": [
    "JavaScript",
    "Java",
    "PHP",
    "C#"
  ]
}

Response body

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

GET /polls/:pollId

Return data from a single poll.

Response body

{
	"poll": {
		"id": "e4365599-0205-4429-9808-ea1f94062a5f",
		"title": "What is your favorite programming language?",
		"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
			}
		]
	}
}

POST /polls/:pollId/votes

Add a vote to specific poll.

Request body

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

WebSockets

ws /polls/:pollId/results

Message

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