Passing callback as function argument

Question

I have a hard time with callback and couldn't figure out if this is actually the right way to pass a callback function as an argument. Please help me out. Below is my code snippet

Service module

jwt.signToken({userName: success.data.username, userId: success.data.userId}, secret, expiresIn, (error, token) => {
    if(error) {
        console.log('::::::::::Error generating token::::::::');
        console.log(error);
        next(returnError({message: 'Internal Server Error', status: 500}));
        } else {
            sendSuccessResponse({data: {token: token, user: {userName: success.data.username, userId: success.data.userId},status: 200}}, response);
        }
});

Auth module

const signToken = (payload, secret, expireIn, callback) => {
    jwt.sign(payload, secret, {expiresIn: expireIn}, (error, token) => callback(error, token));
};

Thanks in advance

Answer 1

I'm able to successfully execute the code..Reiterating look at the code how I'm handling the callback in service layer

jwt.signToken({userName: success.data.username, userId: success.data.userId}, secret, expiresIn, function(error, token) {
    if(error) {
        next(returnError({message: 'Internal Server Error', status: 500}));
        } else {
            sendSuccessResponse({
                data: {
                token: `${token}`,
                user: {
                    userName: success.data.username,
                    userId: success.data.userId
                }
            },
            status: 200
        },response);
    }
});

And my jwt module is

const signToken = (payload, secret, expireIn, callback) => {
    jwt.sign(payload, secret, {expiresIn: expireIn}, (error, token) => callback(error, token));
};

This can be a simple demonstration of passing callback implementation (done in one module) to another function (in another module) as a parameter.