Question 116234 in Mongodb Question posted in
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Mongodb – How to foreach object in the array on nodejs

`

const data = [{'name': 'Apip'}, {'name': 'Rohmat'}, {'name': 'ujang'}]
data.forEach(function (response) {
     res.json(response)
})

`

I did the code above it doesn’t work and then it throws an error "Cannot set headers after they are sent to the client"

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2

Answers


  1. 0

    You have to send the data in a batch:

    const data = [{'name': 'Apip'}, {'name': 'Rohmat'}, {'name': 'ujang'}]
res.json(response)

    See Why can’t I use res.json() twice in one post request?

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  2. 0

    If you want to just response the same array object, then you should write res.json(data).

    const data = [{'name': 'Apip'}, {'name': 'Rohmat'}, {'name': 'ujang'}]
res.json(data)

    But, if you are doing some check or modification within forEach to array object then it depend how you want the output.

    const data = [{'name': 'Apip'}, {'name': 'Rohmat'}, {'name': 'ujang'}]
var modified_data = []
data.forEach(function (response) {
    // DO SOME CHECK OR CHANGE IN THE ARRAY OBJECT 
    // modified_data.push(// Your modified data) 
})
res.json(modified_data);

    You are getting this error is because, you have already sent result in the body, and forEach is trying to set the header again.

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