How can I call a function from inside json

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Javascript

I need to call the function moveUpB from inside the response.status(200).send part and I think that part is json, but I don't know that much about json. The response.status and moveUpB are inside the handleMove function. I have been trying everything to get it to work for weeks and I still have no idea. The rest of my code is there in case it is needed. I need to send data to a different website or server or something, and the response.status sends it. My move commands need to be in handlemove and if I try to use move commands above the response.status, they only execute once. If I try to use it below the response.status, it gives me an error. This makes me think that my move commands need to be called from inside the response.status part. I hope someone here can help me.

const express = require('express')

const PORT = process.env.PORT || 3000

const app = express()
app.use(bodyParser.json())

app.get('/', handleIndex)
app.post('/start', handleStart)
app.post('/move', handleMove)
app.post('/end', handleEnd)

app.listen(PORT, () => console.log(`Battlesnake Server listening at http://127.0.0.1:${PORT}`))

function handleIndex(request, response) {
  var battlesnakeInfo = {
    apiversion: '1',
    author: '',
    color: '#1c607d',
    head: 'caffeine',
    tail: 'leaf'
  }
  response.status(200).json(battlesnakeInfo)
}

function handleStart(request, response) {
  var gameData = request.body

  console.log('START')
  response.status(200).send('ok')
}

function handleMove(request, response) {
  var gameData = request.body

What I have tried:

Everything I could think of and nothing worked.