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Akshita SinghAkshita Singh 

Full Response body is not coming

I made a class to call third party to get access token. We had to send User_name and password, and get access_token in response
public class TS_Api {
public  string password;
public string id;
public static string access_token;


    //This call is to login to server. You will be given an access_token.

       public static void Login(){
       String trustURL,trustID,trustPass;
           
       HttpRequest req = new HttpRequest();
       req.setEndpoint(Endpoint);
       req.setMethod('POST');
       req.setHeader('Content-Type', 'application/json');
       req.setBody('{ "user_name" : "", "password" : "" }');

     Http http = new Http();
     HTTPResponse res = http.send(req);
     System.debug(res.getBody());
	 
           JSONParser parser = JSON.createParser(res.getBody());
        while (parser.nextToken() != null) {
            if ((parser.getText() == 'access_token')) {
                parser.nextToken();
                Access_Token = parser.getText();
                system.debug('access : '+Access_Token ); 
            } 
        }         
 
 }
}
While i was doing it my response is coming incomplete 
Response is- 
{"data":{"access_token":"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJpbnRlcm5hbF9kZXYiLCJleHAiOjE1NjUyNjY1MDUsImlzcyI6InRydXNpbmdfc29jaWFsIiwidXNlcl9pZCI6MTc0LCJyb2xlcyI6WyJ1c2VyIiwic2NvcmVfY2xpZW50X290cF9zbXMiLCJzY29yZV9jbGllbnRfY29uc2VudF9zbXMiLCJzY29yZV9jbGllbnRfZXh0ZXJuYWxfY29udHJhY3QiLCJsZWFkX2NsaWVudCJdfQ.f-lLUkezgvD_TnfzCxWvvk6MATwfNalnYio1lZLRG1sZeTqTURjDjdNq5dm8KYpc_pDr5zm7t22i8SEqtqXgpcxVRjGQ6R9E2rGWGd3nEooxsBfBHDzQgn61oFxbY0OwfsbPBPZk6Yld5W9TMchPWRaEnMgNWAS

Meanwhile I am getting a perfect access token in postman so it is not issue fromt here end. Lenth of access token was 623 characters(Jason Web Token format).
Can somebody please Help me out. I am new to salesforce and struck at this point.