How to check for payload in vk api keyboard?

Question

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How to check the contents of payload in vk api if my Payload is: "payload": "{\"button\": \"3\"}"

I do everything on Node JS

Answer 1

const pld = {"payload":"{\"button\": \"3\"}"};
const payloadObj = JSON.parse(pld.payload);  // преобразуем строку в объект

if (Number(payloadObj.button) === 3) {
 // тут выполняете нужный код
}