How can i use promise method in node - node.js

Question

I was trying out the promise function for the REST API instead of using axios method. so I can wait for the result and if there is any error. can anyone help me change this code to promise in node.js so I can do a fetch using promise method. thank you
this is my code
const email = "xxx#xxxx.com"
function isUserExists(email, kc_accessToken) {
let url = `${path}/users?email=${email}`;
return axios_instance.get(url,
{
headers: {
"content-type": "application/json",
"authorization": `Bearer ${kc_accessToken}`
}
}).then(function (response) {
if (response.data.length > 0) {
return true;
} else {
return false;
}
})
.catch(function (error) {
console.log("some error occured");
});
}
Method call
http.createServer(function Test() {
getAccessToken().then(function (response) {
kc_accessToken = response.data.access_token;
IsUserExists(email, kc_accessToken).then((resp) => {
console.log(resp)
if(resp) {
console.log("Do Not Create")
} else if (!resp) {
console.log("Creat a new User")
}
})
}).catch(function (error) {
// handle error
console.log(error);
})
.then(function () {
// always executed
});;
}).listen(8081);

Answer 1

I think you need something like that :
const email = "xxx#xxxx.com"
const request = require('request');
function isUserExists(email, kc_accessToken) {
let url = `${path}/users?email=${email}`;
return new Promise(function(resolve, reject){
request({
url: url,
headers: {
"content-type": "application/json",
"authorization": `Bearer ${kc_accessToken}`
}
}, function (error, response, body) {
if (error) {
console.log("some error occured");
}
if (response.data.length > 0) {
return resolve();
}
return reject();
});
});
}