NodeJS creating JSON using all JSONs uploaded by user - json

Question

I am trying to make a JSON file using all the JSON files in a directory. Every time a user uploads a new JSON a new combined JSON should be generated. I want the new JSON to have a custom structure hence cant use any libraries. I have the following code:
router.post('/upload', function(req, res) {
var sampleFile;
var bbbid = req.body.bbbid;
DDLFile = req.files.DDLFile;
j++;
DDLFile.mv('/uploads/' + bbbid + '/device' + j + '.json', function (err) {
if (err) {
res.status(500).send(err);
}
else {
res.redirect("fileuploaded");
}
});
var myfiles = [];
var fs = require('fs');
var arrayOfFiles = fs.readdirSync('/uploads/' + bbbid);
arrayOfFiles.forEach(function (file) {
myfiles.push(file);
console.log(myfiles);
});
console.log('No of Files:', myfiles.length);
var files = myfiles.length;
console.log('Files:', files);
console.log('J', j);
var cddl = "{ BBBID:" + bbbid;
if (files == 0) {
cddl = cddl + '}';
console.log('Entered if loop');
}
else {
var i = 0;
/*var obj;
fs.readFile('/uploads/' + bbbid + '/device' + j + '.json', 'utf8', function (err, data) {
if (err) throw err;
obj = JSON.parse(data);
});*/
for (i = 0; i < files; i++) {
console.log('Entered For loop');
console.log('Count:', count);
console.log('Sensor:', sensor);
try{
var obj = fs.readFileSync('/uploads/' + bbbid + '/device' + count + '.json', 'utf8');}
catch(err){
console.log(err);
}
console.log('everything good');
var obj1 = JSON.parse(obj);
console.log('hi');
//JSON.stringify(obj);
var ddl = require('/uploads/' + bbbid + '/device' + count + '.json');
console.log('o');
cddl = cddl + ", {" + obj1.DDL.Sensor.Description.Verbose_Description + ":" + JSON.stringify(ddl) + "}"
JSON.stringify(cddl);
console.log(cddl);
count++;
sensor++;
console.log('Count:', count);
console.log('Sensor:', sensor);
}
cddl = cddl + '}';
JSON.stringify(cddl);
console.log(cddl);
}
});
I want to generate a new cddl everytime a new file is uploaded. Having a lot of problems. Help please!

Answer 1

I see two problems. First instead of this:
var obj = fs.readFileSync('/uploads/' + bbbid + '/device' + count + '.json', 'utf8');}
catch(err){
console.log(err);
}
console.log('everything good');
var obj1 = JSON.parse(obj);
You can write(fix path, if necessary):
var obj1 = require('./uploads/' + bbbid + '/device' + count + '.json')
Then, when you call:
JSON.stringify(cddl);
You're not saving the result anywhere. So you should save it in the place, you need to:
var a = JSON.stringify(cddl);
And when all set, dont forget to write to file back using fs.writeFileSync or async one fs.writeFile.