Mastering ExcelJS: Advanced Excel Operations in Node.js

The ExcelJS library in Node.js enables developers to create, read, and manipulate Excel files with ease. This tutorial dives deep into the advanced features of ExcelJS to help you master Excel operations like formatting, charts, conditional styling, and working with large datasets.

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1. Getting Started

First, set up your Node.js project:

mkdir exceljs-mastery
cd exceljs-mastery
npm init -y
npm install exceljs

Create a file named index.js.

2. Creating a Basic Workbook and Worksheet

Here’s how to initialize a workbook and worksheet:

const ExcelJS = require('exceljs');

const workbook = new ExcelJS.Workbook();
const worksheet = workbook.addWorksheet('Sales Data');

3. Adding Data Dynamically

You can insert rows and columns dynamically from a data array.

worksheet.columns = [
  { header: 'ID', key: 'id', width: 10 },
  { header: 'Product', key: 'product', width: 30 },
  { header: 'Price', key: 'price', width: 15 },
  { header: 'Quantity', key: 'quantity', width: 15 },
  {…