Best Invoice Generator Project Using React JS

Introduction

Creating invoices is something almost every freelancer, startup, or small business has to do. But let’s be honest making invoices again and again in Word or Excel quickly becomes frustrating. That’s why building an Invoice Generator web application is such a smart and practical project. It’s simple on the surface, yet powerful enough to show your real development skills.

This project focuses on generating professional PDF invoices instantly using a clean React-based interface. Unlike basic beginner projects like counters or calculators, an invoice generator demonstrates real business logic and provides genuine value to users. It’s perfect for students who want to create something meaningful for their portfolio while learning essential React concepts.

Project Overview

Key Features of the Invoice Generator

Core Features

• Add multiple invoice items dynamically
• Automatic calculation of subtotal, tax, and discounts
• Clean and responsive user interface
• Generate and download invoices in PDF format
• No backend required (runs completely on the frontend)
• Professional invoice template with business details
• Real-time price calculations
• Form validation for required fields

Why This Project Is a Smart Choice

Most beginners stop at very basic apps like counters or to-do lists. This project goes a step further and helps you learn:

• Real-time state management: Managing complex state with multiple items and calculations
• Form handling and validations: Working with dynamic forms and user input
• PDF generation logic: Converting React components to downloadable PDFs
• A real business workflow: Understanding how invoicing works in the real world
• Component design: Creating reusable and organized React components

Step-by-Step Installation Guide

Step 1: Install Node.js

Download and install Node.js from the official website. Check your installation:

node -v
npm -v

Step 2: Create React App

npx create-react-app invoice-generator
cd invoice-generator

Step 3: Install Dependencies

Install the required packages for PDF generation:

npm install jspdf html2canvas

Step 4: Start the Development Server

npm start

Step 5: Open in Browser

Navigate to

Complete Code Example

Here’s a complete working example of the Invoice Generator:

App.js – Main Component

import React, { useState } from 'react';

import jsPDF from 'jspdf';

import html2canvas from 'html2canvas';

import './App.css';

function App() {

  // State for invoice data

  const [invoiceData, setInvoiceData] = useState({

    invoiceNumber: '001',

    date: new Date().toISOString().split('T')[0],

    clientName: '',

    clientEmail: '',

    items: [

      { description: '', quantity: 1, price: 0 }

    ],

    tax: 10,

    discount: 0

  });
  // Add new item to invoice

  const addItem = () => {

    setInvoiceData({

      ...invoiceData,

      items: [...invoiceData.items, { description: '', quantity: 1, price: 0 }]

    });

  };
  // Remove item from invoice

  const removeItem = (index) => {

    const newItems = invoiceData.items.filter((_, i) => i !== index);

    setInvoiceData({ ...invoiceData, items: newItems });

  };
  // Update item details

  const updateItem = (index, field, value) => {

    const newItems = invoiceData.items.map((item, i) => {

      if (i === index) {

        return { ...item, [field]: value };

      }

      return item;

    });

    setInvoiceData({ ...invoiceData, items: newItems });

  };
  // Calculate totals

  const calculateSubtotal = () => {

    return invoiceData.items.reduce((sum, item) => {

      return sum + (item.quantity * item.price);

    }, 0);

  };
  const calculateTax = () => {

    return (calculateSubtotal() * invoiceData.tax) / 100;

  };
  const calculateTotal = () => {

    return calculateSubtotal() + calculateTax() - invoiceData.discount;

  };






  // Generate PDF

  const generatePDF = () => {

    const input = document.getElementById('invoice-content');

    html2canvas(input).then((canvas) => {

      const imgData = canvas.toDataURL('image/png');

      const pdf = new jsPDF();

      const imgWidth = 210;

      const pageHeight = 295;

      const imgHeight = (canvas.height * imgWidth) / canvas.width;

      let heightLeft = imgHeight;

      let position = 0;
      pdf.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);

      heightLeft -= pageHeight;
      while (heightLeft >= 0) {

        position = heightLeft - imgHeight;

        pdf.addPage();

        pdf.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);

        heightLeft -= pageHeight;

      }
      pdf.save(`invoice-${invoiceData.invoiceNumber}.pdf`);

    });

  };
  return (

    <div className="App">

      <h1>Invoice Generator</h1>
      {/* Invoice Form */}

      <div className="invoice-form">

        <div className="form-group">

          <label>Invoice Number:</label>

          <input

            type="text"

            value={invoiceData.invoiceNumber}

            onChange={(e) => setInvoiceData({...invoiceData, invoiceNumber: e.target.value})}

          />

        </div>
        <div className="form-group">

          <label>Client Name:</label>

          <input

            type="text"

            value={invoiceData.clientName}

            onChange={(e) => setInvoiceData({...invoiceData, clientName: e.target.value})}

          />

        </div>
        <div className="form-group">

          <label>Client Email:</label>

          <input

            type="email"

            value={invoiceData.clientEmail}

            onChange={(e)