Reading Excel file using node.js

Okay so i am using the FileUploader module to upload my file from angular to my REST API:

var uploader = $scope.uploader = new FileUploader({
url: api.getUrl('uploadCompetence',null)
});

This is sent to the following POST function:

        router.route('/api/uploadCompetence')
.post(function (req, res) {


// This is where i want to read the file


var competence = Competence.build(req.body.location);
competence.add(function (success) {
res.json({message: 'quote created!'});
},
function (err) {
res.status(err).send(err);
});
})

Now my goal is to read the excel file and then add each row to my database.

However im not quite sure how i can read the file from Node.js i have debugged my server and couldnt find the file anywhere but the the api is being called from my Angular application

Can anyone push me in the right direction? :)

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最佳答案

There are a few different libraries doing parsing of Excel files (.xlsx). I will list two projects I find interesting and worth looking into.

Node-xlsx

Excel parser and builder. It's kind of a wrapper for a popular project JS-XLSX, which is a pure javascript implementation from the Office Open XML spec.

node-xlsx project page

Example for parsing file

var xlsx = require('node-xlsx');


var obj = xlsx.parse(__dirname + '/myFile.xlsx'); // parses a file


var obj = xlsx.parse(fs.readFileSync(__dirname + '/myFile.xlsx')); // parses a buffer

ExcelJS

Read, manipulate and write spreadsheet data and styles to XLSX and JSON. It's an active project. At the time of writing the latest commit was 9 hours ago. I haven't tested this myself, but the api looks extensive with a lot of possibilites.

exceljs project page

Code example:

// read from a file
var workbook = new Excel.Workbook();
workbook.xlsx.readFile(filename)
.then(function() {
// use workbook
});


// pipe from stream
var workbook = new Excel.Workbook();
stream.pipe(workbook.xlsx.createInputStream());
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Install 'spread_sheet' node module,it will both add and fetch row from local spreadsheet

小开

You can also use this node module called js-xlsx

1) Install module
npm install xlsx

2) Import module + code snippet

var XLSX = require('xlsx')
var workbook = XLSX.readFile('Master.xlsx');
var sheet_name_list = workbook.SheetNames;
var xlData = XLSX.utils.sheet_to_json(workbook.Sheets[sheet_name_list[0]]);
console.log(xlData);
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install exceljs and use the following code,

var Excel = require('exceljs');


var wb = new Excel.Workbook();
var path = require('path');
var filePath = path.resolve(__dirname,'sample.xlsx');


wb.xlsx.readFile(filePath).then(function(){


var sh = wb.getWorksheet("Sheet1");


sh.getRow(1).getCell(2).value = 32;
wb.xlsx.writeFile("sample2.xlsx");
console.log("Row-3 | Cell-2 - "+sh.getRow(3).getCell(2).value);


console.log(sh.rowCount);
//Get all the rows data [1st and 2nd column]
for (i = 1; i <= sh.rowCount; i++) {
console.log(sh.getRow(i).getCell(1).value);
console.log(sh.getRow(i).getCell(2).value);
}
});
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Useful link

https://ciphertrick.com/read-excel-files-convert-json-node-js/

 var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var multer = require('multer');
var xlstojson = require("xls-to-json-lc");
var xlsxtojson = require("xlsx-to-json-lc");
app.use(bodyParser.json());
var storage = multer.diskStorage({ //multers disk storage settings
destination: function (req, file, cb) {
cb(null, './uploads/')
},
filename: function (req, file, cb) {
var datetimestamp = Date.now();
cb(null, file.fieldname + '-' + datetimestamp + '.' + file.originalname.split('.')[file.originalname.split('.').length -1])
}
});
var upload = multer({ //multer settings
storage: storage,
fileFilter : function(req, file, callback) { //file filter
if (['xls', 'xlsx'].indexOf(file.originalname.split('.')[file.originalname.split('.').length-1]) === -1) {
return callback(new Error('Wrong extension type'));
}
callback(null, true);
}
}).single('file');
/** API path that will upload the files */
app.post('/upload', function(req, res) {
var exceltojson;
upload(req,res,function(err){
if(err){
res.json({error_code:1,err_desc:err});
return;
}
/** Multer gives us file info in req.file object */
if(!req.file){
res.json({error_code:1,err_desc:"No file passed"});
return;
}
/** Check the extension of the incoming file and
*  use the appropriate module
*/
if(req.file.originalname.split('.')[req.file.originalname.split('.').length-1] === 'xlsx'){
exceltojson = xlsxtojson;
} else {
exceltojson = xlstojson;
}
try {
exceltojson({
input: req.file.path,
output: null, //since we don't need output.json
lowerCaseHeaders:true
}, function(err,result){
if(err) {
return res.json({error_code:1,err_desc:err, data: null});
}
res.json({error_code:0,err_desc:null, data: result});
});
} catch (e){
res.json({error_code:1,err_desc:"Corupted excel file"});
}
})
});
app.get('/',function(req,res){
res.sendFile(__dirname + "/index.html");
});
app.listen('3000', function(){
console.log('running on 3000...');
});
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You can use read-excel-file npm.

In that, you can specify JSON Schema to convert XLSX into JSON Format.

const readXlsxFile = require('read-excel-file/node');


const schema = {
'Segment': {
prop: 'Segment',
type: String
},
'Country': {
prop: 'Country',
type: String
},
'Product': {
prop: 'Product',
type: String
}
}


readXlsxFile('sample.xlsx', { schema }).then(({ rows, errors }) => {
console.log(rows);
});

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