here i need to convert my excel to json,since i have been in the right path file only.While running it shows a following error:
[TypeError: Cannot set property length of [object Object] which has only a getter]Any help?
node_x = require("xls-to-json");
var stack = new Error().stack;
try{
node_x({
input: "Book1.xls", // input xls
output: "output.json" // output json
}, function(err, result) {
if(err) {
console.error(err);
} else {
console.log(result);
}
});
}catch(e){
console.log("ssfffs");
console.error(e);
}
Try entering the sheet name as well
node_xj = require("xls-to-json");
node_xj({
input: "Book1.xls", // input xls
output: "output.json", // output json
sheet: "sheetname" // specific sheetname
}, function(err, result) {
if(err) {
console.error(err);
} else {
console.log(result);
}
});
Related
I am trying to import data in excel file to mysql just like row colon using nodejs are there any references i can learn or any module in nodejs that does my work or any sample code
I used Npm packages "xlsx-to-json-lc" and "xls-to-json-lc" to import excel file to json directly without converting to csv. Hope this helps...
var storage = multer.diskStorage({ //multers disk storage settings
destination: function (req, file, cb) {
cb(null, './uploads/')
},
filename: function (req, file, cb) {
var datetimestamp = dateFormat(new Date(), "yyyy~mm~dd h~MM~ss");
cb(null, '`enter code here`templete' + '-' + datetimestamp + '.' +
`enter code here`file.originalname.split('.')[file.originalname.split('.').length - 1])
filename = file.fieldname;
}
});
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');
var exceltojson;
upload(req, res, function (err) {
if (err) {
res.json({ error_code: 1, err_desc: err });
return;
}
if (!req.file) {
//res.json({ error_code: 1, err_desc: err });
return;
}
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 });
}
else {
console.log(result);
}
});
})
I've found several examples on S/O and otherwise, but they don't seem to be helping me.
I'm creating a private module in node that takes in a csv and converts it into a json object. It is properly outputting the correct value onto the command line, but the object itself is undefined.
exports.csvToJSON = function(file, callback) {
converter.fromFile(file, function(err, result) {
if (err) {
console.log('error: ', error)
} else {
return result;
callback(err, result);
}
});
console.log(callback)
}
I'm currently using the csvtojson module and have tried other similar packages. Articles I've referenced:
Function Returns undefined object
Why does this callback return undefined?
Why is function return value undefined when returned in a loop? (although not entirely relevant as this is not a loop function)
Callback returning undefined
I'm unsure if I'm just not understanding the callback correctly, but even if I console.log(result.type), it returns back undefined with or without the callback. I've also tried defining the callback like so:
exports.csvToJSON = function(file, callback) {
csvtojson().fromFile(file, function(err, result) {
if (err) {
console.log('error: ', error)
}
return result;
callback(result);
});
}
Here's an example of the console output:
Mirandas-MacBook-Pro:zendesktool mirandashort$ node ./controllers/update.js
[ { ticket:
{ ids: '3280805',
requester_email: 'miranda#barkbox.com',
status: 'pending',
comment: [Object],
subject: 'sup dog',
custom_fields: [Object],
add_tags: 'update_via_csv, dogs_are_cool, sup' } } ] undefined
Right now, since my other functions are dependent on this working, I'm only calling it in the file with exports.csvToJSON('update2.csv') where update2.csv is an actual file. Eventually this will be called inside another function in which I will be utilizing async, but I need this to work first. Additionally, that output seems to be linked to console.log(err) when called by the second code block example, which I'm not to sure why.
Or if there's a way to do this altogether without csvtojson, that's fine too. The only requirement be that a file in csv format can be returned as an object array.
Got it. I just used waterfall to put the two individual modeles together:
exports.csvToJSON = function(file, callback) {
csvtojson().fromFile(file, function(err, result) {
if (err) {
console.log(err);
} else {
callback(null, result[0]);
}
});
}
exports.zdUpdateMany = function(data, callback) {
credentials.config.tickets.updateMany(3280805, data, function(err, result) {
if (err) {
console.log(err);
} else {
callback(false, result);
}
});
}
// function to update tickets
exports.processUpdate = function(file, callback) {
async.waterfall([
async.apply(exports.csvToJSON, file),
exports.zdUpdateMany
], function(err, result) {
if (err) {
console.log(err);
} else {
console.log(result);
}
callback(err, result);
});
}
I would like to analyze a JSON file I dynamically create with Watson's tone analyzer. I would like it to read the file, then analyze it.
How can I make the tone_analyzer.tone method read the file? Thank you.
app.get('/results', function(req, res) {
// This is the json file I want to analyze
fs.readFile('./output.json', null, cb);
function cb() {
tone_analyzer.tone({
// How can I pass the file here?
text: ''
},
function(err, tone) {
if (err)
console.log(err);
else
console.log(JSON.stringify(tone, null, 2));
});
console.log('Finished reading file.')
}
res.render('results');
})
Your callback is missing a couple of arguments (error, data) (see the node fs documentation for more info). Data is the content of your file and would go where you are sending the text.
Try something like this:
app.get('/results', function(req, res) {
// This is the json file I want to analyze
fs.readFile('./output.json', 'utf8', cb);
function cb(error, data) {
if (error) throw error;
tone_analyzer.tone({
// How can I pass the file here?
text: data
},
function(err, tone) {
if (err)
console.log(err);
else
console.log(JSON.stringify(tone, null, 2));
});
console.log('Finished reading file.')
}
res.render('results');
})
Thanks to user Aldo Sanchez for his tip. I converted the input into JSON first since fs was returning it in the form of buffer data. Also, I made it search for the specific value in the key/value pair and return that content, instead of returning the whole string. This can be directly inputted to Watson's tone analyzer.
var data = fs.readFileSync('./output.json', null);
JSON.parse(data, function(key, value) {
if (key == "message") {
cb(value);
}
function cb(value, err) {
if (err) throw err;
tone_analyzer.tone({
text: value
},
function(err, tone) {
if (err)
console.log(err);
else
console.log(tone);
});
}
console.log('Finished reading file.')
});
I'm trying to parse XML to JSON in Node. I'm using xml2js. I'd like to incorporate Lodash to loop through each number in an array and use the corresponding url to convert the XML to JSON. When I use the code below, I get a Non-whitespace before first tag error. Any idea what I'm doing wrong?
const no = [78787878,78787879, 787878780];
_.forEach(no, https.get('https://tsdrapi.uspto.gov/ts/cd/casestatus/'+no+'/info.xml', function (res) {
res.on('data', function (chunk) {
response_data += chunk;
});
res.on('end', function () {
parser.parseString(response_data, function (err, result) {
if (err) {
console.log('Got error: ' + err.message);
} else {
console.log(util.inspect(result, false, null));
}
});
});
res.on('error', function (err) {
console.log('Got error: ' + err.message);
});
}));
Honestly the forEach helper in LoDash is kind of silly. forEach is a prototype method of any Array instance. One problem is that these functional helpers are not designed to handle async flow control.
While there are a dozen ways to handle flow control the easiest would probably be to use caolan/async module's map() method.
You're code would look something like:
var no = [78787878,78787879, 787878780];
async.map(no, function(cb) {
https.get('https://tsdrapi.uspto.gov/ts/cd/casestatus/'+no+'/info.xml', function (res) {
var response_data = '';
res.on('data', function (chunk) {
response_data += chunk;
});
res.on('end', function () {
parser.parseString(response_data, function (err, result) {
if (err) {
cb(err);
} else {
cb(null, result);
}
});
});
res.on('error', cb);
})
}, function(err, results) {
if(err) {
console.log("Error occured: ", err);
}
else {
console.log("Results(array): ", results);
}
});
The difference here is that async maps the array to a function with a callback. This way you can gather the response from each request into an array and fire a callback when each request has responded. If one of them error's out the process stops and fires the final callback where the error is logged(or you can write logic to handle another way).
I am trying to change the file name of the pdf generated by the npm module html-pdf.
The issue is I do not want to save a copy of the pdf, just stream it to an email service ( mailgun) and then send it off. I have everything working but when I receive the email the file has a default name that I want to change. Does anyone have any experience trying to do this?
Thanks
var pdf = require('html-pdf');
var Mailgun = require('mailgun-js');
pdf.create(result).toStream(function(err, stream) {
var self = this;
if (err) return console.log(err);
//set mailgun parameters
var mail_data = {
from: 'emailtosendto#email.com',
to: 'sendingemail#email.com',
subject: 'subject line',
html: result,
attachment: stream
}
//send email
mailgun.messages().send(mail_data, function (err, body) {
if (err) {
res.render('error', { error : err});
console.log("got an error: ", err);
}
else {
console.log(body);
res.send('ok');
}
});
});
var pdf = require('html-pdf');
var Mailgun = require('mailgun-js');
pdf.create(result).toBuffer(function(err, buffer) {
var self = this;
if (err) return console.log(err);
var attch = new mailgun.Attachment({data: buffer, filename: 'myattach.pdf'});
//set mailgun parameters
var mail_data = {
from: 'emailtosendto#email.com',
to: 'sendingemail#email.com',
subject: 'subject line',
html: result,
attachment: attch
}
//send email
mailgun.messages().send(mail_data, function (err, body) {
if (err) {
res.render('error', { error : err});
console.log("got an error: ", err);
}
else {
console.log(body);
res.send('ok');
}
});
});
From https://github.com/bojand/mailgun-js#attachments