Invoice Processing API

This is a RESTful API for creating, managing, and processing invoices, implemented using Node.js, Express, and MongoDB. The API allows clients to create invoices, update existing ones, fetch invoices by ID, and delete them.

Features

Create invoices with multiple line items
Update invoices
Retrieve invoices by ID
List all invoices
Delete invoices
Input validation and sanitization
Centralized error handling
Rate limiting

Tech Stack

Node.js
Express
MongoDB
TypeScript
Validator

Getting Started

Prerequisites

Node.js (v14+ recommended)
npm

Installation

Clone the repository:

git clone https://github.com/yourusername/invoice-processing-api.git

Install dependencies:

cd invoice-processing-api
npm install

Update the src/database.ts file with your MongoDB connection details:

const uri = "mongodb+srv://your_username:your_password@cluster0.mongodb.net/your_database_name?retryWrites=true&w=majority";

Replace your_username, your_password, and your_database_name with the appropriate values for your MongoDB instance.

Start the development server:

npm start

Your API will be running at http://localhost:3000.

API Endpoints

`GET /invoices`

Fetch all invoices.

`GET /invoices/:id`

Fetch an invoice by ID.

`POST /invoices`

Create a new invoice.

Request Payload:

{
  "id": "sample-id-1",
  "clientName": "Test Client",
  "items": [
    {
      "name": "Item 1",
      "price": 10,
      "quantity": 2
    },
    {
      "name": "Item 2",
      "price": 20,
      "quantity": 1
    }
  ]
}

`PUT /invoices/:id`

Update an existing invoice.

Request Payload:

{
  "clientName": "Updated Client Name",
  "items": [
    {
      "name": "Updated Item 1",
      "price": 15,
      "quantity": 3
    }
  ]
}

`DELETE /invoices/:id`

Delete an invoice by ID.

Testing

Start your API server with npm start if it's not running already.
In a new terminal, run the test script with npm run test-api.

This script will run a series of tests on your API, including fetching all invoices, creating a new invoice, fetching an invoice by ID, updating an invoice, and deleting an invoice. The results will be logged to the console.

You can modify this script to test different scenarios and validate the API functionality.

License

This project is licensed under the MIT License.

technoabsurdist/invoice_system