The URL Shortener API provides a simple and efficient way to shorten long URLs and retrieve their original versions using shortened links. This project is designed to run on AWS Lambda, ensuring scalability and cost-effectiveness. Additionally, it includes GitHub workflows for CI/CD automation.

For the front-end implementation, visit the URL Shortener Frontend Repository.

• Version: 1.0.3
• Author: Gabriel Ribeiro
• License: MIT

The base URL for this API is:
http://localhost:4000

Description: Creates a shortened URL.

Request Body:

{
 "url": "string"
}

• url: The original URL you want to shorten.

Response:

• 200 OK: Returns the shortened URL.

  {
   "shortId": "short123",
   "originalUrl": "https://www.example.com"
  }

• 400 Bad Request: If the provided URL is invalid.

  {
   "error": "Invalid URL"
  }

Example Request:

curl -X POST http://localhost:4000/shorturl -H "Content-Type: application/json" -d '{"url": "https://www.example.com"}'

Example Response:

{
 "shortId": "abc123",
 "originalUrl": "https://www.example.com"
}

Description: Redirects to the original URL for the given shortened ID.

Parameters:

• input: The shortened URL ID.

Response:

• 200 OK: Returns the original URL.

  {
   "originalUrl": "https://www.example.com"
  }

• 404 Not Found: If the shortened URL ID does not exist.

  {
   "error": "URL not found"
  }

Example Request:

curl http://localhost:4000/abc123

Example Response:

{
 "originalUrl": "https://www.example.com"
}

Description: Retrieves a list of all stored URLs.

Response:

• 200 OK: Returns a list of all stored URLs.

  [
   {
   "shortId": "abc123",
   "originalUrl": "https://www.example.com"
   },
   {
   "shortId": "xyz456",
   "originalUrl": "https://www.another-example.com"
   }
  ]

Example Request:

curl http://localhost:4000/url/all

Example Response:

[
 {
 "shortId": "abc123",
 "originalUrl": "https://www.example.com"
 },
 {
 "shortId": "xyz456",
 "originalUrl": "https://www.another-example.com"
 }
]

• CORS: Cross-Origin Resource Sharing is enabled.
• Body Parser: Parses incoming request bodies in JSON format.

The API includes error handling for various scenarios. If an error occurs during a request, a standard error message is returned:

• 500 Internal Server Error: General server errors.

  {
   "error": "Something went wrong!"
  }

• 400 Bad Request: In case of a bad request or invalid URL.

  {
   "error": "Invalid URL"
  }

• 404 Not Found: If a requested URL ID cannot be found.

  {
   "error": "URL not found"
  }

To start the application locally, follow these steps:

1. Clone the repository.
2. Install dependencies:

   npm install

3. Start the application:

   npm start

4. To run in development mode (with TypeScript):

   npm run dev

• start: Starts the server using Node.js.
• build: Compiles the TypeScript files.
• dev: Runs the server in development mode using ts-node.
• lint: Lints the project files with Prettier.
• package: Packages the source files using a custom shell script.
• offline: Starts the serverless offline environment on port 4000.

• express: Web framework for building the API.
• mongoose: MongoDB ODM for interacting with the database.
• cors: Middleware to enable CORS.
• dotenv: Loads environment variables.
• serverless-http: Helps integrate with the Serverless framework.
• valid-url: Validates the URL format.

• typescript: TypeScript compiler.
• prettier: Code formatting tool.
• serverless-offline: Simulates AWS Lambda and API Gateway locally.
• @types/: Type definitions for TypeScript compatibility.

This project is licensed under the MIT License.

Gabriel Ribeiro