expressjs with bodyParser giving array of numbers as array of string

Question

Somehow I realized that when I pass array of numbers to the backend expressjs I I would get array of strings instead of numbers.

This is the ajax code for sending the data

$.ajax({
    method: 'post',
    url: this.url.ajax.send,
    data,
})

This is the values I have in frontend passing to backend

const data = {
  "type": [
    1,
    2
  ],
  "to": [
    0
  ],
  "message": "testing message here"
}

this is what I get in my backend req.body

{ type: [ '1', '2' ],
  to: [ '0' ],
  message: 'testing message here' }

I do have bodyParser setup like such

app.use(bodyParser.urlencoded({
    extended: true,
    parameterLimit: 2000000,  // too many parameter if not set
    limit: 1024 * 1024 * 10  // entity too large if not set
}));
app.use(bodyParser.json({
    extended: true,
    parameterLimit: 2000000,  // too many parameter if not set
    limit: 1024 * 1024 * 10  // entity too large if not set
}));

Is this normal or any way I can fix it?

EDIT: This is an image I see from network tab in chrome's inspect tool

Try making a similar request using Postman (or curl) to your backend and let me know if it still happens. — UtkarshPramodGupta
– UtkarshPramodGupta, Commented Jul 31, 2019 at 19:00
@UtkarshPramodGupta my bad, I did test with postman and with postman it was fine that backend reads as array of numbers. But what I posted above for const data = is what I console.log the values right before ajax call though — Dora
– Dora, Commented Jul 31, 2019 at 19:02
@Dora don't console.log, check in the network request using browser's dev tools what is actually being sent to the backend. — UtkarshPramodGupta
– UtkarshPramodGupta, Commented Aug 1, 2019 at 3:48

Mudzia Hutama · Accepted Answer · 2021-05-27 18:53:08Z

1

parse the string to int with parseInt, example :

let requestBody = {
  type: [ '1', '2' ],
  to: [ '0' ],
  message: 'testing message here'
}

requestBody.type = requestBody.type.map((arr) => {
  arr = parseInt(arr)
  return arr
})

requestBody.to = requestBody.to.map((arr) => {
  arr = parseInt(arr)
  return arr
})

console.log(requestBody)

answered May 27, 2021 at 18:53

Mudzia Hutama

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