I'm learning angular and I have a problem with getting data from service. This is my code ..

code from component.ts

```
 import { Component, OnInit, Input } from '@angular/core';
 import { RegisterService } from '../services/register.service';

 @Component({
   selector: 'app-register',
   templateUrl: './register.component.html',
   styleUrls: ['./register.component.scss']
  })
  export class RegisterComponent implements OnInit {

  contact:string;

  constructor(private data : RegisterService) { }

  ngOnInit() {
  }

  onSubmit(f){
  console.log('value from component.ts',f.value)

  if(f.valid){
  // "username":username,
  // "email":email,
  // "password":password,
  // "c_password":c_password,
  // "contact":contact,
  // "type":"user"
  // }
  console.log('type',f.value.type)
this.data.register(f.value.name,f.value.email,f.value.password,f.value.c_password,f.value.conatct,f.value.type)
.subscribe(res => {
  console.log(res)});
   }
  }

}

```

The problem is getting data from service.

code from service.ts is

```
 import { Injectable } from '@angular/core';
 import { HttpHeaders, HttpClient } from '@angular/common/http';
 import { Body } from '@angular/http/src/body';

 @Injectable({
 providedIn: 'root'
 })

 export class RegisterService {

 API_URL = "http://..";

 constructor(private http: HttpClient) { }

 register(name,email,password,c_password,contact,type){

  let body ={
    "name":name,
    "email":email,
    "password":password,
    "c_password":c_password,
    "contact":contact,
    "type": 'user'
    }
    console.log('body from service',body);

    const headers = new HttpHeaders({
      "Accept" : 'application/json',
      "Content-Type" : 'application/json'
    })

return this.http.post(this.API_URL+"register",body,{headers :headers});
    }
   }

```

Here contact is return undefined in console. I'am a newbie in angular 6. The screenshot of console is adding here.
[The screenshot of console](https://i.stack.imgur.com/hfAC2.png)