looping through an array of objects using node js and mongodb

Question

i am new with using mongodb and node am trying to loop through an array of objects from my database and display only the objects using a res.json, in my console.log it displays all the object, but in my postman using res.json it displays only one object please help

MY CODE

const course = res.GetUserDT.coursesHandled;
  for (let index = 0; index < course.length; index++) {
            console.log(course[index]);
        }

const course = res.GetUserDT.coursesHandled;
  for (let index = 0; index < course.length; index++) {
            res.json(course[index]);
        }

my console output


{ courseCode: '2103' }
{ courseCode: '2012' }
{ courseCode: '2062' }

my postman output


{ courseCode: '2103' }

David Losert · Accepted Answer · 2020-08-07 09:54:45Z

3

Hi and welcome to Stackoverflow.

The Problem here is that res.json() sends a an immidiate response to the requestor - meaning a response is sent already within the first iteration of your for-loop.

I am also wondering why you need that loop - as you are not doing anything within it. So why don't you just send the array immidiately like so:

res.json(res.GetUserDT.coursesHandled);

answered Aug 7, 2020 at 9:54

David Losert

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2 Comments

stefantigro Over a year ago

I missed that in my answer. This should definitely be the accepted answer if you are not doing any array modifications!

ibrahimijc Over a year ago

This is the perfect answer and should be included in the accepted ones.

ibrahimijc · Accepted Answer · 2020-08-07 10:47:30Z

0

You can only send res.json once.

To send all of them together you can create an array, push all the objects in the array and send it back as a response.

let arrayToReturn = []
for (let index = 0; index < course.length; index++) {
   arrayToReturn.push(course[index])
}
res.json(arrayToReturn);

Update

@David's answer is the most accurate solution i.e just directly send the array as a response instead of looping

res.json(res.GetUserDT.coursesHandled);

edited Aug 7, 2020 at 10:47

answered Aug 7, 2020 at 9:52

ibrahimijc

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2 Comments

ibrahimijc Over a year ago

You're welcome but david's answer is more simple and accurate because there is no need for loop unless you need some modification.

watch dog Over a year ago

it worked but how do i pull all the courses from the array and display as separate data

stefantigro · Accepted Answer · 2020-08-07 09:51:52Z

0

Assuming that is express, res.json() will send the data and end the response.

try something like:

 const responseArray = [];
 
 for (let index = 0; index < course.length; index++) {
    responseArray.push( course[index] ); 
 }
 res.json(responseArray);

answered Aug 7, 2020 at 9:51

stefantigro

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