In Nodejs/Express js i am unable to return response to Angular 6 - express

Question

I am using Angular 6 and Nodejs/Expressjs to avoid cross domain issue. So here is my code
In Angular i am calling:
this.httpClient.post('/uploadFile', formData, {params: params})
.pipe(map((res: any) => {return res}),
catchError((error: HttpErrorResponse) => {})
Nodejs/Expressjs:
app.post('/uploadFile', (req, res) => {
let formData
const form = new IncomingForm();
let readStream;
form.on('file', (field, file) => {
console.log('file.path>>>',file.path);
readStream = fs.createReadStream(file.path);
});
form.on ('fileBegin', function(name, file) {
//rename the incoming file to the file's name
let fileName = file.path.split("\\");
fileName[fileName.length-1] = file.name.split('.')[0];
fileName = fileName.join("\\");
file.path = fileName;
console.log('file.path', file.path);
console.log('file.name', file.name);
})
form.parse(req, function (err, fields, files) {
formData = new FormData();
formData.append("file", readStream);
formData.append('package_name', req.query.packagename);
formData.append('type', req.query.type);
formData.append('version', req.query.version);
formData.append('descr', req.query.descr);
console.log('req.query.packagename',req.query.packagename);
const axiosConfig = {
headers: {
'Content-Type': 'multipart/form-data'
}
};
let uploadRequest = request.post("WebAPiCallURL", requestCallback);
uploadRequest._form = formData;
uploadRequest.setHeader('Content-Type', 'multipart/form-data');
function requestCallback(err, res, body) {
return JSON.parse(body);
}
});
});
From requestCallback i am unable to send response to Angular6

Answer 1

Your not sending response from to the client. To send you can use res.send or any of the response function from Expressjs.
function requestCallback(err, response, body) { //Rename res to response to avoid conflict
res.send(body); // Send Response to Client
}
Note : As you used same variable res for request, Rename to some other name