quick-excel-json/src/utils/option.js

Convert Excel (.xlsx, .xls, .csv) files to JSON easily. Fast, lightweight, and perfect for React, Node.js, and web applications. Supports SheetJS and ExcelJS and a simple npm package to convert JSON data to an Excel (.xlsx, .xls) file using SheetJS (xlsx)

import * as XLSX from 'xlsx';

// excel to json
export const fileHandler = file => {
    return new Promise((resolve, reject) => {
        if (!file) {
            reject("No file provided");
            return;
        }

        const reader = new FileReader();
        reader.onload = (e) => {
            try {
                const data = e.target.result;
                const workbook = XLSX.read(data, { type: "array" });
                const sheetName = workbook.SheetNames[0];
                const worksheet = workbook.Sheets[sheetName];
                const json = XLSX.utils.sheet_to_json(worksheet, { raw: false });
                resolve(JSON.stringify(json, null, 2));  // JSON natijani qaytaramiz
            } catch (error) {
                reject(error);
            }
        };

        reader.onerror = () => reject("File reading error");
        reader.readAsArrayBuffer(file);
    });
}

// json to excel
export const handleExportHandler = (jsonData) => {
    if (jsonData instanceof File) { // checks if it is a file.
        const reader = new FileReader();

        reader.onload = (e) => {
            const data = JSON.parse(e.target.result);
            const ws = XLSX.utils.json_to_sheet(data); // converting json data to excel
            const wb = XLSX.utils.book_new(); // create excel file
            XLSX.utils.book_append_sheet(wb, ws, "Sheet1"); // create excel file
            XLSX.writeFile(wb, "exported_data.xlsx"); // download file
        };

        reader.readAsText(jsonData);
    } else {
        const ws = XLSX.utils.json_to_sheet(jsonData); // converting json data to excel
        const wb = XLSX.utils.book_new(); // create excel file
        XLSX.utils.book_append_sheet(wb, ws, "Sheet1"); // create excel file
        XLSX.writeFile(wb, "exported_data.xlsx"); // download file
    }
};