Read Excel (XLSX) file in Angular 18

In this walk, you will learn the following things.

Create an angular project.
Install NPM Package XLSX (https://www.sheetjs.com)
Restrict the user from uploading only the XLSX file to the input tag.
Restrict the user to select only one file at a time to upload.
Read Excel file (XLSX)
Get XLSX data in JSON format.

How is it implemented and how is it working in the description?

Create Angular project - AnguDemo.
Run the application and check project was created successfully.
Install NPM package called read-excel-file by command

Command

npm install xlsx --save

Verify package is installed or not.
First, implement UI/Frontend side (HTML file) coding.
Component (TS file) coding.
Execute the Project
Output

Create an Angular Project called “AnguDemo” using the following CLI command.

Command

ng new AnguDemo

Example

AnguDemo

CD AnguDemo

[Go inside project folder with the complete path]

Open Visual Studio code by using the following command.

Command

code

Example

Code

Note. Visual Studio code will get started only if your system is configured with path and settings.

Before starting coding related WebCam first have to install a WebCam library called “ngx-webcam”.

Command

npm install xlsx --save

Example

Save

NPM Package link to know about this package Options and Events: https://www.npmjs.com/package/xlsx?activeTab=readme

You can see detailed documentation by clicking the above link.

How to cross-check whether check read-excel-file package is installed or not?

Open the Package.json file which is located in the root of the project folder. Inside the dependencies section, you can check the ‘read-excel-file’ entry with the version number marked in red color.

Dependencies

XLSX is a package from the SheetJS community. XLSX is an open-source and freeware solution for extracting useful data and generating new spreadsheets.

https://sheetjs.com/

SheetJS community

Click on Community Edition’s section Documentation button.

Now click on Demo Projects you will get so many tools and readymade code for XLSX files and other important topics.

Demo Projects

As you can see in the above screen there are lots of utility codes given refer to the following link: https://docs.sheetjs.com/docs/getting-started/examples/import

Now we going to implement import Excel data.

Open the app.Component.html file and update the following code.

<p>Select XLSX File</p>

<input 
  type="file" 
  id="input" 
  accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/vnd.ms-excel" 
  (change)="onFileSubmit($event)" 
  multiple="false" 
/>

Let's Understand the above Input type=file command.

For Excel Files 97-2003 (.xls).

application/vnd.ms-excel

For Excel Files 2007+ (.xlsx).

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
multiple="false"

Only one will be allowed at a time not multiple.

Open the app.component.ts file and update the following code.

import { Component } from '@angular/core';
import { RouterLink, RouterOutlet } from '@angular/router';
import * as XLSX from "xlsx";
@Component({
  selector: 'app-root',
  standalone: true,
  imports: [RouterOutlet, RouterLink],
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'Angular Demo';

  onFileSubmit(evt: any) {
    // File received
    const fileReced: DataTransfer = <DataTransfer>(evt.target);

    // Check how many files are received
    if (fileReced.files.length > 1) {
      alert('Only Single File allowed');
      return;
    } else {
      const reader: FileReader = new FileReader();

      reader.onload = (e: any) => {
        const binarystring: string = e.target.result;
        console.log(binarystring);

        const workbook: XLSX.WorkBook = XLSX.read(binarystring, { type: 'binary' });
        const worksheetname = workbook.SheetNames[0];
        const worksheet: XLSX.WorkSheet = workbook.Sheets[worksheetname];

        // Converting to JSON
        let excelsheetdata = (XLSX.utils.sheet_to_json(worksheet, { header: 1 }));

        // Print the Excel Data
        console.log(excelsheetdata);

        // You can use a loop to display the data on screen or process it as needed
      };

      reader.readAsArrayBuffer(fileReced.files[0]);
    }
  }
}

Now run the application by following the command.

Command

ng serve --open

Excel Sheet Data View

Excel sheet

Output

Excel Data import was completed successfully.

Happy Coding!