Unable to read specific JSON keys in my lambda function

Question

Having this undefined issue in my node lambda function here is the code

exports.handler = async function (event, context) {
console.log('top')
console.log(event.body)
console.log(event.body.value)
console.log('bottom')

return {
    statusCode: 200,
    body: JSON.stringify(event)
} }

And here is a cloud watch screenshot

Im new to lambda and post requests so any help as to the value key is much appreciated