const XLSX = require("xlsx"); const fs = require("fs"); // do export for excel to json output or data json object function _internalExport() { const NAME = process.env.APP_NAME || "excel2json"; console.log("APP NAME =>", NAME, "\n"); // load from env const INPUT_FILE = process.env.INPUT_FILE || "./data/people.xlsx"; const OUTPUT_PATH = process.env.OUTPUT_PATH || "./data/outputs"; const MAPPER_FILE = process.env.MAPPER_FILE || "./data/mapper.json"; const SHEET_NAME = process.env.SHEET_NAME || "Sheet1"; const ENCODING = process.env.ENCODING || "utf-8"; // get mapper in string var mapperString = undefined; try { mapperString = fs.readFileSync( MAPPER_FILE, { encoding: ENCODING }, (err) => { if (err) { console.error(err); } console.log("Load file suceed =>", MAPPER_FILE); } ); } catch (err) { console.error("read file error", err); } // convert mapper from string to json object const mapperJson = mapperString ? JSON.parse(mapperString) : {}; const configs = mapperJson.configs || {}; const columsData = mapperJson.data || undefined; // read workbook from excel file const wb = XLSX.readFile(configs.inputFile || INPUT_FILE); const xlData = XLSX.utils.sheet_to_json( wb.Sheets[configs.sheetName || SHEET_NAME] ); // mapping the data from read excel file const data = xlData.map((row) => { if (columsData == undefined || !columsData) { return row; } var _r = {}; columsData.map((col) => { _r[col.label] = row[col.dataIndex]; }); return _r; }); // parse a new path const outputPath = configs.outputPath || OUTPUT_PATH; // check directory and create it if not exist if (!fs.existsSync(outputPath)) { fs.mkdirSync(outputPath, { recursive: true }); } // able to save to output or not (default is true) const saveToOutput = configs.saveToOutput || true; if (saveToOutput) { // json data output const jsonStringData = JSON.stringify(data); try { // write to file fs.writeFileSync( `${outputPath}/${ configs.outputName || "exported" }_${new Date().getTime()}.json`, jsonStringData, (err) => { if (err) throw err; console.log("Write succeed!"); } ); } catch (err) {} } return data; } /** * excel2json * Allow to export data from excel to json object or output of json. * * @returns JSON Object of result */ module.exports = excel2json = () => { return _internalExport() }