Calling Variable outside the Scope of "Request" in Request npm. at node.js

Question

var request = require('request');

request("http://example.com/index.php?username=username&password=password, function (error, response, body) {



var n1 = body.search('<user>');
var n2 = body.search('</user>');
var final = body.slice(n1+6, n2);


//it is working perfectly here. 
final10 = final;


 });

//The problem is that i can not call the "body" or variable "Final10" outside the Scope.

var final10=request.body

Hi, I am Newbie in Node JS. I am trying to make a Experimental Bot. i am using "request" to send a "Get" to my website. there through "Php", it is getting saved in "Mysqli" database.

Everything is working fine and i am getting the result. but, as i had got the data required, i can not access it. How can i get access to the 'body' of 'Request' from outside the function?

Please refer above to the code

Is there any way, to call it outside of it? that i can manage my code more easily

Please Note: it is just a little snap of the code the real code. the real code got a lot of if/else, loops and other functions. Turing it into bracket under brackets will be little complicated.

Thankyou

Answer 1

So the request function is asynchronous, which means that you call request("http://...") and node js fires that function, and then skips to the next line without waiting for it to finish. So if you had:

request("http://example.com/index.php?username=username&password=password", function() {
   console.log("1");
});

console.log("2");

You would see 2 logged before 1. Which brings us to the function that is the second argument of request: the callback function. You are passing in a function for request to call, once it has finished making the api request to your url. So if we change the above example to:

request("http://example.com/index.php?username=username&password=password", function() {
   console.log("1");
   console.log("2");
});

You would see 1 logged before 2.

Request takes the function you pass in and injects the parameters: error, response and body which you can work with inside the callback function.

Because you are working with request through a callback function here, which gets called asynchronously, you can only use body within the callback function.

request("http://example.com/index.php?username=username&password=password", function(error, response, body) {
   // do something with the response body
   console.log("Logging the response body", body);
});

You need to access the body within the scope of the callback function.