How can I return value after get-request in node.js?

Question

How can I get this value when I get a response from the server?

The terminal is not outputing any information when I run it.

console.log(a);
function findMaxID() {
    var a = needle.get(URL, function(err, res){
        if (err) throw err;
        return 222; 
    });
    return a;
}

@BelminBedak Can you show me a simple of code? I'm used promisses many times, but here, in this example my promises don't work — Александр Князев, Jan 23 '17 at 12:54
http://stackoverflow.com/questions/22519784/how-do-i-convert-an-existing-callback-api-to-promises might be of help. — ste2425, Jan 23 '17 at 12:59

Mouradif · Answer 1 · 2018-06-25T23:06:51.210

Basicly, you can't really return this value in the way functions return values. what you CAN do is give your findMaxID() function a callback parameter to be called when the data is fetched :

function findMaxID(callback) {
    needle.get(URL, function(err, res){
        if (err) throw err;
        callback(res); 
    });
}

then call it like this :

findMaxID(function(id) {
    console.log('Max ID is : ', id);
}

You can also return a promise :

function findMaxID() {
    return new Promise(function (resolve, reject) {
        needle.get(URL, function(err, res){
            if (err) reject(err);
            resolve(res);
        });
    });
}

And call it like this :

findMaxID().then(function(id) {
    console.log('Max ID is ', id);
})

EDIT

Or like this if you're under an async function :

var id = await findMaxId();
console.log(id); // logs the ID

How can I return value after get-request in node.js?

1 Answers1

EDIT