To insert excel file data into salesforce(Account - Object), Create a new apex class and create an LWC for uploading files. Make the changes in javascript for upload and insert the data in salesforce to achieve this task.
my query is I write the j.s. but how to write apex  for that i want to know,

here is my code:

import { LightningElement, track } from 'lwc';
import { loadScript } from 'lightning/platformResourceLoader';
import sheetmin from '@salesforce/resourceUrl/sheetmin';
let XLS = {};
export default class xlsxDemo extends LightningElement {
@track acceptedFormats = ['.xls', '.xlsx'];
    connectedCallback() {
        console.log('connected callback');
        Promise.all([
            loadScript(this, sheetmin  )
        ]).then(() => {
            XLS = XLSX
            
        })
    }
    handleUploadFinished(event){
        const uploadedFiles = event.detail.files;
        console.log('uploadedFiles',uploadedFiles);
        if(uploadedFiles.length > 0) {   
            this.ExcelToJSON(uploadedFiles[0])
        }
    }
    ExcelToJSON(file){
        var reader = new FileReader();
        reader.onload = event => {
            var data=event.target.result;
            var workbook=XLS.read(data, {
                type: 'binary'
            });
            var XL_row_object = XLS.utils.sheet_to_row_object_array(workbook.Sheets["Sheet1"]);
            var data = JSON.stringify(XL_row_object);
            console.log(JSON.stringify(data));
        };
        reader.onerror = function(ex) {
            this.error=ex;
            this.dispatchEvent(
                new ShowToastEvent({
                    title: 'Error while reding the file',
                    message: ex.message,
                    variant: 'error',
                }),
            );
        };
        reader.readAsBinaryString(file);
    }
}

please help me out how to write apex for this requirement.